JP2019126661A - Exercise implement for trunk - Google Patents

Abstract

To provide an exercise implement for the trunk capable of applying a load to the trunk while suppressing a change in the position of each part of the body.SOLUTION: An exercise implement for the trunk includes: a handle; a first support part for supporting the handle in a state that the handle can reciprocate in a direction intersecting with a back muscle direction of a user; and a second support part for supporting the first support part in a state that the first support part can reciprocate in a direction intersecting with the back muscle direction of the user. The handle reciprocates actively with respect to the first support part by the power transmitted from a driving source, and the second support part has its position fixed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a trunk exercise apparatus.

The trunk is generally regarded as the part excluding human head and limbs. By training the trunk, it is said that the posture improves and the basal metabolism improves, and a device for training the trunk has also been developed.

For example, Patent Document 1 discloses an exercise device having a pair of pistons disposed in front of a user's chest and a grip portion provided at one end of the pistons. This device is said to reciprocate the piston back and forth while the user holds the grip by hand, thereby repeatedly opening the chest of the user and opening the chest more widely.

Patent Document 2 similarly discloses an exercise device having a pair of grips disposed in front of the user's chest. This exercise device is configured such that the movement of the stroke of the gripping portion can be controlled separately by the right gripping portion and the left gripping portion.

JP, 2009-142554, A JP, 2012-85987, A

As a result of repeated studies by the present inventor, it has been found that the following ability is important for a human to maintain an appropriate posture. For example, for a sudden load input to the trunk, it is the ability to reflexively control the muscles necessary to maintain the same posture as before the load was input. This ability involves load detection and communication from brain and spine to muscles. Also, for example, the ability to rapidly contract or relax muscles required to maintain the same posture as before a load is input with respect to a load that has been suddenly input. Also, for example, it is a muscle force sufficient to maintain the same posture as before the load is input with respect to the load input suddenly. Failure of these functions may lead to a disorder in posture and cause back pain.

In the devices such as Patent Document 1 and Patent Document 2 described above, the position of the user's hand, arm, trunk, and the like is greatly shaken by the reciprocating gripping portion. Therefore, in these devices, the positional relationship between each part of the body largely changes before and after the load is input to the body. Because of this, these devices do not lend themselves to improving the above-mentioned capabilities needed to maintain the same attitude.

Even in the devices such as Patent Document 1 and Patent Document 2, if the gripping portion can be held with a force that antagonizes the power output from the drive source, the user's body will not be greatly shaken. However, in this case, the drive source may be broken.

An object of the present invention is to provide a trunk exercise apparatus capable of applying a load to the trunk while suppressing a change in the position of each part of the body.

A state in which the first support portion supports the handle such that the handle can reciprocate in the direction crossing the direction of the spine of the user, and the first support portion can reciprocate in the direction intersecting the direction of the spine of the user And the second support portion for supporting the first support portion, the handle actively reciprocates with respect to the first support portion by the power transmitted from the drive source, and the second support portion The above-mentioned problems are solved by the trunk exercise apparatus whose position is fixed. In this trunk exercise apparatus, for example, when the user tries to stop the reciprocation of the handle by holding the handle by hand, the second support portion whose position is fixed and the handle whose movement is limited are used. And reciprocate so that the position of the first support portion is shifted. For this reason, for example, even if the user completely stops the reciprocating motion of the handle, the power of the drive source is consumed in the operation of reciprocating the first supporting portion with respect to the second supporting portion. It is possible to stop the reciprocation of the handle without damaging the This allows the user to carry out an exercise that loads the trunk while maintaining the position of the body in a constant state.

In the above-described exercise apparatus for trunk, it is preferable that the reciprocation width of the handle be adjustable. By adjusting the reciprocation width of the handle, it is possible to adjust the load acting on the trunk. For example, if the width is increased, exercise load can be reduced by reducing the frequency of load peaks generated in unit time. Also, for example, if the width is reduced, it is possible to increase the exercise load by increasing the frequency of the load peak generated in unit time.

In the above-described trunk exercise apparatus, it is preferable that the speed at which the handle reciprocates can be adjusted. By adjusting the speed at which the handle reciprocates, it becomes possible to adjust the load acting on the trunk. For example, if the speed is increased, the exercise load can be increased by increasing the peak value of the load acting on the trunk and increasing the frequency of the load peaks generated in unit time. Also, for example, if the speed is decreased, the exercise load can be increased by reducing the peak value of the load acting on the trunk and reducing the frequency of the load peak generated in the unit time. .

In the above-described trunk exercise apparatus, the drive source is preferably a motor, and the handle is preferably reciprocated by receiving the power of the motor. The use of a motor makes it possible to operate the handle quickly.

In the above-described exercise apparatus for trunk, it is preferable that the drive source is connected to the first support and reciprocates integrally with the first support. This makes it possible to miniaturize the device by shortening the path for transmitting the power of the drive source.

In the above-described exercise apparatus for the trunk, any one of the first support and the second support is provided with a concave, and the other of the first support and the second support is provided with a convex. It is preferable that the grooves are fitted to the ridges. This makes it possible to prevent the first support and the second support from being unintentionally separated during operation of the trunk exercise apparatus.

In the above-described trunk exercise apparatus, the handle is preferably disposed in the range of the trunk of the user. This makes it possible to perform an exercise that loads the user's trunk in a comfortable posture.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the trunk exercise apparatus which can apply a load to a trunk, suppressing the change of the position of each part of the body.

It is a front view of the exercise device for the trunk which concerns on one Embodiment. It is a side view of the exercise device for trunks of FIG. It is an enlarged view of the A section of FIG. It is a top view of the exercise device for trunks of FIG. 1 in the state which removed the handle | steering-wheel. It is sectional drawing of a 1st support part. It is a front view which shows the state which operated the drive source in the state which does not hold | maintain a handle | steering-wheel. It is a front view which shows the state which operated the drive source in the state which does not hold | maintain a handle. It is a front view which shows the state in which the user hold | maintained the handle. It is a front view which shows the state which operated the drive source in the state which the user hold | maintained the handle | steering-wheel. It is a front view which shows the state which operated the drive source in the state which the user hold | maintained the handle | steering-wheel. It is a figure which shows the structure of the test apparatus used in the Example. It is a graph which shows the relationship between the force input into the compression type load cell installed in the test apparatus, and elapsed time. It is a graph which shows the average value of the muscular activity amount of the right external oblique muscle and the left external oblique muscle when the trunk exercise apparatus is used. It is a graph which shows the average value of the amount of muscle activity of the right external oblique oblique muscle and the left external oblique muscle when the condition of the operation of the first support portion of the trunk exercise apparatus is changed.

Hereinafter, an embodiment of a trunk exercise apparatus will be described with reference to the drawings. The following trunk exercise equipment is merely an example, and the present invention is not limited thereto.

As shown in FIGS. 1 and 2, the trunk exercise apparatus 1 according to the present embodiment includes a handle 11, a first support 13, and a second support 15.

The handle has a shape that is easy for a user of the trunk exercise device 1 to grasp with the hand, and in a state where the position of the handle is not fixed, the handle is actively applied to the first support portion by the power transmitted from the drive source. It may be configured to be able to reciprocate.

In the exercise device 1 for trunk according to the present embodiment, as shown in FIG. 1, the handle 11 includes a pair of left and right grips 111 and 111 and a pedestal 112 for fixing the grips 111 and 111. As shown in FIG. 2, the gripping portion 111 includes a first rod-shaped portion 111 a protruding from the pedestal 112, a second rod-shaped portion 111 b projecting from the pedestal 112, an end of the first rod-shaped portion 111 a and a second rod-shaped portion It is a shape provided with the 3rd rod-shaped part 111c which follows the end of 111b. The user can grip any part of the first rod-shaped portion 111a, the second rod-shaped portion 111b, and the third rod-shaped portion according to the physique and the posture of using the device.

The first support portion may be configured to be able to support the handle in a state in which the handle can reciprocate in a direction intersecting the direction of the user's spine.

In the exercise device 1 for trunk according to the present embodiment, as shown in FIGS. 1 and 5, the first support portion 13 has the actuating portion 131 driven by receiving the power of the drive source, and reciprocates The plate-like pedestal 112 of the handle 11 is connected to the actuating part 131. The actuating portion may have any shape as long as the handle 11 can be connected. In the present embodiment, the actuating portion 131 has a rectangular shape.

More specifically, as shown in FIG. 5, the first support portion 13 is a housing incorporating a ball screw 132, a nut portion 133 screwed to the ball screw 132, a ball screw 132 and a nut portion 133. 134. The housing 134 is provided with a bearing 135 that rotatably supports the ball screw 132. A groove 136 is provided on the inner wall of the housing 134 as a guide portion. The groove 136 guides the nut portion 133 to move along the longitudinal direction of the housing 134. The nut portion 133 is provided with a protrusion corresponding to the groove 136. Instead of the groove 136, a ridge may be provided on the inner wall of the housing 134, and a concave groove corresponding to the ridge may be provided on the nut portion 133.

In the exercise device 1 for trunk according to the present embodiment, as shown in FIG. 5, the drive source 18 is connected to the first support 13. For this reason, the first support portion 13 and the drive source 18 are in an integral relationship. In the trunk exercise apparatus 1 of the present embodiment, a motor is employed as the drive source 18. The drive source 18 is configured to be able to transmit power to the above-mentioned ball screw 132, and by rotating the drive source 18 in the forward or reverse direction, the ball screw 132 interlocks and rotates in the forward or reverse direction. Thus, it is possible to reciprocate the actuating portion 131 in the direction crossing the direction of the spine of the user. As shown in FIG. 8 and FIG. 9 described later, in the present embodiment, the direction intersecting the direction of the spine of the user coincides with the substantially horizontal direction.

The pedestal 112 of the handle 11 is fixed to the actuating portion 131 as described above. When the drive source 18 is operated, as shown by the broken lines and arrows in FIGS. 6 and 7, when the user does not fix the position of the handle 11, the handle 11 and the handle 11 can be driven by power transmitted from the drive source. The operating portion 131 reciprocates integrally with the first support portion 13.

In the exercise device 1 for trunk according to the present embodiment, a motor is employed as a drive source. This is preferable because the handle can be moved back and forth more quickly than when using a hydraulic cylinder or an air cylinder as a drive source. If it is desirable that the operation of the handle be slow considering the user's condition, a fluid cylinder such as an air cylinder or a hydraulic cylinder may be used as the drive source. When a fluid cylinder is used, the tip of a piston built in the fluid cylinder may be fixed to the actuating portion 131. Further, the handle may be directly fixed to the piston of the fluid cylinder.

More specifically, in the exercise device 1 for trunk according to the present embodiment, a servomotor is used as a drive source. In the servomotor, by controlling the motor electrically based on the parameters set by the controller, the direction in which the ball screw 132 rotates, the speed, the number of rotations at one time, the number of repetitions of forward rotation and reverse rotation, etc. are arbitrary. Can be adjusted. Accordingly, the number of times the handle reciprocates, the width of the handle reciprocating, the speed at which the handle reciprocates, or the acceleration / deceleration G can be easily set. The number of times the handle reciprocates, the direction in which the handle reciprocates, the width, the speed, or the acceleration G can be controlled by, for example, a control unit (servo amplifier) that stores a control program. Even when an air cylinder or a hydraulic cylinder is used as a drive source, a controller for setting the parameters and a control unit for controlling the operation unit 131 may be provided in the same manner.

The second support portion may be configured to support the first support portion 13 in a state in which the second support portion can reciprocate in a direction crossing the user's spine direction, and the second support portion may be configured to have a fixed position. .

In the trunk exercise device 1 of the present embodiment, as shown in FIGS. 2 and 3, the second support portion 15 includes a pedestal 151 and two rail portions 152 arranged on the upper surface of the pedestal 151. Including. The rail portion 152 is provided with the concave streaks 133 on the left and right side surfaces thereof. On the other hand, the above-described first support portion 13 is provided with a convex streak 132 having a shape corresponding to the concave streak 133. The second support portion 15 supports the first support portion 13 in a reciprocably movable state by fitting the concave streaks 133 and the convex streaks 132 in a slidable state, and unintentionally performs the first support It becomes possible to prevent the part 13 and the 2nd support part 15 from separating unintentionally. By preventing separation of the first support portion 13 and the second support portion 15, it is possible to prevent an accident when using the trunk exercise device 1.

In the example shown in FIGS. 2 and 3, the first support portion 13 is provided with the ridge 132, and the second support portion 15 is provided with the recess 133. It is good also as a structure which provides a groove on the 1st support part 13, and provides a protrusion on the 2nd support part 15. FIG. That is, any one of the first support portion and the second support portion is provided with a recess, and the other of the first support portion and the second support is provided with a protrusion, and the recess and the protrusion are provided. It is preferred that the strip be fitted.

In the example of FIGS. 2 and 3, the second support portion 15 has the rail portion 152 provided on the pedestal 151. It is good also as a structure which provides a groove or a protruding item | line on the side surface of the base 151, abbreviate | omitting a rail part, and comprises a 2nd support part only from the rail part which abbreviate | omitted the base 151 and provided the item or a convex line Also good.

The second support portion 15 supports the first support portion 13 so as to be capable of reciprocating in a direction crossing the direction of the spine of the user. Therefore, as shown in FIG. 8, when the user 9 holds the handle 11 with his / her hand so that the position of the handle 11 does not move, the broken line and the arrow in FIGS. The first support portion 13 reciprocates in the direction intersecting the back muscle direction. That is, it becomes possible for the user 9 to completely stop the reciprocation of the handle 11 by applying to the handle 11 a force that antagonizes the reciprocation of the handle. At this time, the power of the drive source 18 is consumed in the operation of reciprocating the first support portion 13 with respect to the second support portion 15 and the handle 11 as shown by the broken line and the arrow in FIGS. 9 and 10. This makes it possible to prevent the failure of the drive source 18 when the user 9 applies a load for stopping the handle 11 to the trunk exercise apparatus 1. For example, in the case of a motor, it is possible to prevent the burn-in caused by the rotation of the motor being stopped.

As shown in FIGS. 1 and 3, the pedestal 151 of the second support portion 15 is fixed to the gantry 2. The gantry 2 is fixed to the floor surface with screws. For this reason, as shown in FIGS. 9 and 10, when the first support portion 13 reciprocates, the second support portion 15 swings in conjunction with the reciprocation of the first support portion 13. It is possible to prevent the situation. The position of the second support 15 can be fixed by, for example, setting the weight of the gantry 2 large or fixing the second support 15 to a stationary object such as a wall or a floor. .

As shown in FIGS. 8 to 10, the trunk exercise device 1 according to the present embodiment is provided with a handle 9 so that the user 9 can hold the handle 11 in a standing and comfortable posture. 11 was placed in the range of the user's trunk. As a result, it is possible to perform an exercise that applies a load to the trunk of the user 9 in a comfortable posture. According to the state of the user 9, it is also possible to use a trunk exercise apparatus while sitting on a chair or the like. Even in this case, it is preferable that the handle is arranged in the range of the trunk of the user 9.

As described above, in order to maintain a proper posture for human beings, the muscles necessary to maintain the same posture as before the load is input are reflexively controlled against the sudden load input to the trunk. Have the ability to quickly contract or relax in response to a control signal, the muscle itself required to maintain the same posture as before the load was input against a load that was suddenly input, It is necessary to have enough strength to maintain the same posture as before the load was input for the load input suddenly.

For example, the trunk bends when a human squatting. Also, for example, when the person performs an operation to look back, the trunk turns. When such an operation is performed, a sudden load acts on the trunk, and the position of the waist is also suddenly displaced. If the above-mentioned ability is not sufficient, the muscles supporting the lower back can not cope with the sudden load applied to the trunk, and the lower back moves excessively. That is, unless the information transfer from the brain or spine to the muscles is made quickly, the muscles can not rapidly contract or relax and the lumbar region excessively moves. Even if the information transfer is made quickly, if the muscles themselves lack the ability to contract or relax quickly, the waist will also move excessively. Even with sufficient information transfer and muscle contraction or relaxation, if the muscle strength is insufficient, the waist can move excessively without being able to support the load. And, if the lumbar region moves excessively, it causes back pain to develop.

In the exercise device 1 for trunk according to the present embodiment, the first support portion 13 is reciprocated relative to the second support portion 15 by gripping the handle 11 with a force that counteracts the force that the handle 11 tries to reciprocate. By moving it, the position of the handle 11 can be maintained in an immobile state. For example, when the handle 11 moves to the right, the user 9 applies an opposing force to push the handle 11 to the left. When the handle 11 moves leftward, the user 9 applies an antagonistic force to push the handle 11 to the right. In this way, the user's own posture can be maintained at a constant posture without being influenced by the movement of the steering wheel. The opposing force means that the force at which the handle moves is equal to the force at which the hand presses the handle.

It is necessary for the user 9 to maintain the same posture against the load that is suddenly input to the body by repeatedly applying a force that antagonizes the movement of the handle to the handle 11 in accordance with the movement of the handle 11. The ability to control the muscles reflexively against sudden loads, the ability of the muscles themselves to contract or relax quickly in response to control signals, or to build muscle strength sufficient to maintain posture become.

That is, to stop a handle that suddenly moves to the right side, the user must apply a force that quickly contracts or relaxes the corresponding muscle and antagonizes the movement of the handle. As the handle suddenly moves to the left, in order to stop the handle moving to the left this time, the corresponding muscles must be quickly contracted or relaxed to exert a force that counteracts the movement of the handle. As you repeat these movements, you gain the strength and strength needed to maintain the same posture. The user may use the trunk exercise apparatus blindfolded. Vision is blocked by blinding. This makes it possible to train the ability to maintain posture and strength according to the force input from the hand to the trunk more efficiently.

In the trunk exercise apparatus 1 of the present embodiment, whether or not the ability and muscle strength for maintaining the posture are appropriately trained by the user himself / herself visually checking the operation of the first support portion 13 and the handle 11. You can check. That is, if the handle 11 is kept stationary and the first support portion 13 reciprocates with respect to the second support portion 15, it can be determined that an appropriate movement is being performed. If the handle 11 reciprocates, it can be determined that an appropriate exercise can not be performed.

When the operation of fixing the handle 11 of the trunk exercise apparatus 1 according to the above embodiment was performed, it was verified by the following method how much force (N) is input to the trunk.

[Configuration of test equipment]
As shown in FIG. 11, the frame 81 for fixing the handle 11 is attached to the trunk exercise apparatus 1 according to the above embodiment so that the position of the handle 11 is fixed so as not to move. The frame 81 is fixed to the floor surface. For this reason, the frame 81 is prevented from moving when the handle 11 reciprocates. The compression type load cell 82 was fixed between the frame 81 and the handle 11. The acceleration / deceleration G, speed (mm / s) and reciprocating width (± mm) of the first support portion 13 can be changed by a control portion and a controller (not shown). The acceleration / deceleration G means the acceleration acting on the first support at the time of acceleration or deceleration of the first support, the speed means the moving speed of the first support 13, and the reciprocation width is the first support When the center of 13 is set as the origin, it means the distance that the first support portion 13 has moved from the origin in the positive or negative direction. These parameters are set by the controller and automatically operated by feedback control by the servo amplifier and servo motor.

When the driving source of the trunk exercise apparatus 1 with the handle 11 fixed to the frame 81 is operated, the handle 11 presses the compression type load cell fixed to the frame 81. The voltage generated by the compression of the compression type load cell was input to the computer via the sensor interface, converted to force (N), and recorded in the computer. The sampling frequency was 1000 Hz.

The number of times the first support portion 13 reciprocated was set to seven, and the acceleration / deceleration G of the first support portion 13 was set to 1G. The speed of the 1st support part 13 was changed with 100 mm / s, 200 m / s, and 300 mm / s, and the reciprocation width of the 1st support part 13 was changed with +/- 20mm, +/- 40mm, +/- 60mm. That is, the force (N) input to the compression type load cell was measured under a total of nine conditions while changing the speed and the reciprocation width.

An example of the measurement result of force is shown in FIG. In FIG. 12, the X axis indicates time (milliseconds). As shown in FIG. 12, when the first support portion 13 starts to slide to the left, a force is applied to the compression type load cell installed on the right side of the first support portion 13, and the value of the force is greatly increased, and is eventually attenuated To do. A waveform in which the force is greatly increased as compared to a waveform in which the force described later rises slightly is called a peak, and the value at that time is called a peak value. Thereafter, the operation of the first support portion 13 is folded back in the right direction. When the first support portion slides to the right and stops, the value of the force slightly increases. Then, after 300 milliseconds, the first support portion 13 again starts to slide to the left, and the value of the force largely increases. This pattern was repeated thereafter.

The time for the first support 13 to slide to the right and stop moving to the left was about 300 milliseconds under all conditions.

Next, the average value of the peak value of the force input to the compression type load cell and the time interval (millisecond) at which the peak value of the force appears were determined. As shown in FIG. 12, the peak value of the force (N) at the third to fifth reciprocations of the first support portion that reciprocates seven times and the time interval (milliseconds) at which the peak values appear are extracted. , Averaged. The average value of peak value of force is shown in Table 1, and the average value of time interval of appearance of peak value is shown in Table 2. In Table 1 and Table 2, the minimum value and the maximum value of the measured values are shown in parentheses.

As is clear from Table 2, it was confirmed that the time interval at which the peak value of the force input to the compression type load cell appears decreases as the width at which the first support portion reciprocates decreases. From this, it can be understood that the motion load can be increased by increasing the frequency of occurrence of the peak value of the force generated within the unit time by reducing the width of the first support to reciprocate. On the other hand, it can be understood that if the width of reciprocating movement of the first support portion is increased, the frequency of occurrence of the peak value of the force generated within the unit time can be reduced and the exercise load can be reduced.

As is apparent from Table 2, it was confirmed that the time interval at which the peak value of the force input to the compression load cell appears was shortened as the speed at which the first support portion reciprocated was increased. From this, it can be understood that if the speed at which the first support portion reciprocates is increased, the frequency of occurrence of the peak value of the force generated within the unit time can be increased to increase the exercise load. On the contrary, it can be understood that if the speed at which the first support portion reciprocates is reduced, the frequency of occurrence of the peak value of the force generated within the unit time can be reduced and the exercise load can be reduced.

As apparent from Table 1, it was confirmed that the peak value of the force input to the load cell increases as the speed at which the first support portion reciprocates increases. From this, it can be seen that if the speed at which the first support part reciprocates is increased, the force input to the trunk can be increased to increase the exercise load. On the other hand, it can be understood that if the speed at which the first support portion reciprocates is reduced, the force input to the trunk can be reduced to reduce the exercise load.

In general, low-intensity exercise at 20 to 30% of the maximum muscle strength is recommended for exercise aiming at core stability. In the case of healthy men, the isometric maximum torso rotation torque is said to be about 90 Nm. For golfers, the isometric maximum torso torque is said to be 100 to 140 Nm.

For example, a user with an isometric maximum trunk rotation torque of 90 Nm tries to stop the reciprocation of the handle in a state where the elbow joints are bent 90 ° toward the trunk exercise apparatus 1, In the case where the length from the center of the user's trunk rotation to the handle is 0.3 m, the maximum torso rotatory strength in the portion of the handle that can be exhibited by the user is 300N. In this case, a load of 90N, which is 30% of 300N, is optimal for performing an exercise that promotes stability of the trunk.

When the user's isometric maximum trunk rotation torque is 150 Nm, a load of 150 N is optimal for performing an exercise that promotes stability of the trunk.

As apparent from Table 1, according to the trunk exercise apparatus 1, the reciprocation width is changed in the range of ± 20 to ± 60 mm, and the speed is changed in the range of 100 to 300 mm / s, 60 to 60 It can apply a load of 150N. From this, it can be seen that according to the trunk exercise apparatus 1, it is possible to preferably carry out an exercise that promotes the stability of the trunk. Also, as shown in Table 2, the interval at which the maximum value of the force input to the user's hand from the handle appears can be adjusted at an interval of 700 to 3200 milliseconds. By adjusting the frequency with which the maximum value of force appears in accordance with the condition of the user, it is also possible to adjust the intensity of exercise.

Next, nine healthy male university students were examined, and the amount of muscular activity of the right external oblique muscle and the left internal oblique muscle, which are the main operating muscles when the trunk rotates in the left direction, was verified. Verification was performed under the following three conditions.

Example 1
In the exercise apparatus 1 for trunk, the speed of the first support portion 13 is 300 mm / s, the reciprocation width of the first support portion 13 is ± 20 mm, and the position of the handle 11 is fixed to each subject so as not to move. I got it. The value of %% MVC (Maximal Voluntary Contraction) obtained by normalizing (normalizing) the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was determined.

Comparative Example 1
The commercially available body blade was shaken as weak as possible, and the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was normalized to the maximum voluntary contraction, and the value% MVC was obtained.

Comparative Example 2
The commercially available body blade was shaken as strongly as possible, and the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was normalized to the maximum voluntary contraction value to obtain a value% MVC.

The% MVC measured under each condition of Example 1, Comparative Example 1, and Comparative Example 2 is averaged and shown in FIG. As is clear from FIG. 13, in the trunk exercise device 1, the amount of muscle activity of the right external oblique muscle and the left internal oblique muscle was about 20% MVC. It is known that muscle activity of 20 to 30% MVC is useful as exercise for stabilizing joints. From this, it can be seen that the trunk exercise apparatus 1 is suitable for exercising the muscles of the trunk that are useful for stabilizing the joints.

Subsequently, the same healthy male university student as described above was used as the subject, and the muscle activity levels of the right external oblique muscle and the left internal oblique muscle were compared by% MVC under the conditions of Examples 2 to 4 below.

Example 2
In the exercise apparatus 1 for trunk, the speed of the first support portion 13 is 300 mm / s, the reciprocation width of the first support portion 13 is ± 20 mm, and the position of the handle 11 is fixed to each subject so as not to move. I got it. The value of %% MVC (Maximal Voluntary Contraction) obtained by normalizing (normalizing) the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was determined.

[Example 3]
In the exercise apparatus 1 for trunk, the speed of the first support portion 13 is 300 mm / s, the reciprocation width of the first support portion 13 is ± 60 mm, and the position of the handle 11 is fixed to each subject so as not to move. I got it. The value of %% MVC (Maximal Voluntary Contraction) obtained by normalizing (normalizing) the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was determined.

Example 4
In the exercise apparatus 1 for trunk, the speed of the first support portion 13 is 100 mm / s, the reciprocation width of the first support portion 13 is ± 60 mm, and the position of the handle 11 is fixed to each subject so as not to move. I got it. The value of %% MVC (Maximal Voluntary Contraction) obtained by normalizing (normalizing) the muscle activity of the right external oblique muscle and the left internal oblique muscle at that time was determined.

The% MVC measured under each condition of Examples 2 to 4 is averaged and shown in FIG. As is clear from the comparison between Example 2 and Example 3 in FIG. 14, the amount of muscle activity of the right external oblique muscle and the left internal oblique muscle is reduced by increasing the reciprocating width of the first support portion 13. Was confirmed to be able to As is apparent from the comparison between Example 3 and Example 4 in FIG. 14, the amount of muscle activity of the right external oblique muscle and the left internal oblique muscle can be reduced by reducing the speed of the first support portion. Was confirmed. As described above, in the trunk exercise apparatus 1, it is possible to adjust and exercise the exercise of weak intensity in stages according to the condition of the user. For example, injured persons, elderly persons, etc., can perform exercise with a small load.

DESCRIPTION OF SYMBOLS 1 Trunk exercise equipment 11 Handle 13 1st support part 15 2nd support part 18 Drive source 131 Actuation part 132 Convex 133 Convex 9 User

Claims (7)

A state in which the first support portion supports the handle such that the handle can reciprocate in the direction crossing the direction of the spine of the user, and the first support portion can reciprocate in the direction intersecting the direction of the spine of the user And a second support portion for supporting the first support portion,
The handle actively reciprocates relative to the first support by power transmitted from the drive source,
The second support portion is a trunk exercise apparatus whose position is fixed. The exercise equipment for trunk | body for which the width | variety to which a handle reciprocates is adjustable is comprised. A trunk exercise apparatus wherein the speed at which the handle reciprocates is configured to be adjustable. The trunk exercise apparatus according to claim 1 or 2, wherein the drive source is a motor, and the handle is configured to reciprocate by receiving the power of the motor. The trunk exercise apparatus according to claim 1, wherein the drive source is coupled to the first support, and reciprocates integrally with the first support. Either one of the first support part and the second support part has a groove, and the other of the first support part and the second support part has a protrusion,
The trunk exercise apparatus according to any one of claims 1 to 5, wherein the concave and the convex are fitted. The trunk exercise apparatus according to any one of claims 1 to 6, wherein the handle is disposed in the range of the trunk of the user.

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