NL2000197C2 - System for measuring weight reduction, an inlay body with force sensor, a shoe and a portable control device. - Google Patents

Description

System for measuring weight reduction, an inlay body with force sensor, a shoe and a portable control device

FIELD OF THE INVENTION

The present invention relates to a system for measuring weight reduction that comprises at least one microchip. The invention further relates to an insert body with a force sensor, a shoe and a portable control device.

STATE OF THE ART

Running over long distances is a very popular sport. Many runners, professionals and amateurs regularly or occasionally run certain distances to get exercise. Some runners also participate in running competitions over long distances, such as (half) marathons.

An important aspect in the successful completion of a long-distance run is drinking sufficient fluid during the run to prevent dehydration and hyponatremia and to achieve a sufficient level of hydration. The amount of fluid that a runner must drink during a run can be predicted based on the duration of the run, the weather conditions, etc. Based on such predictions, a marathon runner can plan when and how much he or she will drink during the run .

Such predictions, however, are not very accurate since the conditions may change during the course and the exact amount of fluid loss may vary with different people and may also differ at different times with the same person.

In fact, drinking enough at many activities and (expensive) sports is important such as walking, speed walking, football, cricket, etc.

It is therefore an object of the invention to provide a runner with more detailed information about the amount of fluid that he or she must take during an activity to compensate for the loss of fluid.

2 00 0 1 97.

2

SHORT DESCRIPTION

According to one aspect, a system for determining a weight decrease is provided, characterized in that at least one microchip is adapted to receive a force signal from an insert body with a force sensor and is arranged to receive an acceleration signal from an accelerometer, the force signal being an indication represents the force exerted on the ground by a user and the acceleration signal indicates the acceleration of the user when it hits the ground, and the at least one microchip is designed to calculate an indication of the weight of the user based on the received force signal and acceleration signal.

According to one aspect, an insertion body with a force sensor is provided, which is in the form of an insertion sole and is suitable for being placed in a shoe comprising at least one force sensor element, which is adapted to generate a force signal indicative of the force which a user exerts on the insert body with force sensor.

According to one aspect, a shoe is provided, the shoe further comprising such an insertion body with force sensor.

According to one aspect, a portable control unit is provided which comprises a microchip 20, characterized in that the microchip is adapted to receive a force signal indicative of a force exerted on the ground by a user and an acceleration signal which is a is an indication of the acceleration of the insert body with force sensor, the microchip being adapted to calculate an indication of the weight of a user on the basis of the received force signal and the acceleration signal.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which corresponding parts are indicated by corresponding reference symbols and in which: Figure 1 schematically shows an embodiment.

3 schematically shows a portable control unit according to an embodiment in Figure 2.

Figure 3 schematically shows an insole according to an embodiment.

Figs. 4 to 6 schematically show flow diagrams according to an embodiment.

Fig. 7 schematically shows a checking device according to an embodiment.

DETAILED DESCRIPTION

10

According to an embodiment of the invention, a system is provided that provides feedback to runners about their actual moisture loss during a run. The system can also provide information about the required amount of fluid to be taken. This information can, for example, be provided just before arrival at a recharging post. Fluid loss can be measured by measuring changes in body weight of a runner while walking.

In FIG. 1 schematically shows an embodiment of the invention. In FIG. 1 shows a runner carrying at least one shoe 10 which comprises a first microchip 12 which is adapted to receive this information from an insert body 11 with a force sensor and an accelerometer 13. The first microchip is additionally adapted to send information to a portable control unit 20 that can be worn around the wrist by the user. The portable control unit 20 is further shown in FIG. 2 and may include a second microchip 21 adapted to receive information from the first microchip 12. The second microchip 21 can additionally be adapted to output data via an output device such as a display window 22 or a loudspeaker (not shown).

The portable control unit 20 may, for example, be in the form of a wrist watch. In addition to the functionality described here, the portable control unit 20 may be designed to have further functionalities. The portable control unit 30 may furthermore be designed such that it works as a normal watch or as a heartbeat control device etc.

In addition, at least one of the first and second microchip 12, 21 may be arranged so as to perform processing steps, as will be explained in more detail later in this document. Each of the microchips 12.21 can perform part of the processing steps or one of the first and second microchips 12.21 can perform all of the processing steps.

The microchips 12, 21 can be specialized chips which are designed for performing a specific, predetermined functionality. The microchips 12, 21 may also include a processor unit (not shown) that is arranged to read and execute programming instructions stored in a memory (not shown).

The insert body 11 with force sensor is adapted to measure a force exerted on the insert body 11 with force sensor. The insert body 11 with force sensor can be a flat device that can be placed in a shoe 10. The insert body can be any type of insert body with which a force can be measured.

An example of an insert body 11 with force sensor can be seen in top view in FIG. 3. The inlay body 11 with force sensor can be manufactured in the form of an insole 15 (insole) that can be placed in the shoe 10. The insert body 11 with force sensor can be built into the shoe 10 or can be a separate insert body which is placed in the shoe 10 by a runner before it starts running.

The insertion body 11 with force sensor can be a piezoelectric insertion body which comprises at least one force sensor element 14 such as a piezo element 14. Such a piezo element 14 is made of a piezoelectric material which generates an electrical voltage when a mechanical is exerted on it, as will be recognized by a person skilled in the art. During running this mechanical force is generated by a foot of the runner when he or she touches the ground and the foot of the runner exerts a force on the insert body 11 with force sensor. The amount of force exerted on the insertion body 11 with force sensor will depend on the weight of the runner and the impact of the runner when he or she hits the ground. The insertion body 11 with force sensor is designed such that it sends a force signal F to the first microchip 12; this signal is an indication of the force exerted on the insert body 11 with a force sensor.

The accelerometer 13 is adapted to measure the acceleration of the shoe 10 and an acceleration signal A transmits to the first microchip 12; this signal is an indication of the acceleration experienced by the accelerometer 13. The accelerometer 13 measures the acceleration with which the shoe 10 hits the ground. The accelerometer 13 can be placed in the vicinity of the piezo element 14.

Both the piezo element 14 and the accelerometer 13 can be placed near the heel part of the shoe 10, because this is the part of the shoe 10 where there is a good chance that the most representative data about the body weight of the runner is obtained. The heel part is the part of the shoe that a user normally first touches the ground with. During this first contact, a peak value is generated, which can be used as a signal to start the calculations.

It can also be assumed that the user leans exclusively on the heel during this peak value, whereby measurements are obtained which offer a good estimate of the body weight of the user.

The piezo element 14 can also be positioned at a different location, for example at the front of the foot. At this location, however, the impulsive forces that result from the deposition for the next step are relatively large.

Of course the insert body 11 with force sensor can also comprise more than one piezo element 14 which are distributed over the surface of the insert body 11 with force sensor.

In general, the insertion body 11 with force sensor can be any type of insertion body or flat device with which a force or pressure can be measured. Thus, in general, any kind of insert body with force sensor can be used.

The force signal F and the accelerometer A are used to calculate an indication of the mass of the runner. Therefore, the insert body 11 with force sensor and the accelerometer 13 both measure in substantially the same direction. The insert body 11 with force sensor can be designed such that it measures force F in a direction substantially perpendicular to the surface of the insert body 11 with force sensor. The accelerometer 13 can be adapted to measure the acceleration A in a direction substantially perpendicular to the surface of the insert body 11 with force sensor. Forces and accelerations in the plane of the insert body 11 with force sensor should not be measured or should not be taken into account, because these mainly provide information about forces and accelerations exerted on the ground by the user during movement, acceleration or delay in the forward direction.

6

The first microchip 12 is adapted to receive the force signal F and the acceleration signal A. The first microchip 12 can convert the analogue force signal F and acceleration signal A into digital signals and send these signals to the second microchip 21 in the portable control unit 20 .

The first microchip 12 and the accelerometer 13 can also be integrated in the insert body 11 with force sensor, so that a compact solution is offered that can easily be used in combination with any shoe 10.

The transfer of data from the first microchip 12 to the second microchip 21 can be accomplished by any suitable communication connection, such as a wireless communication connection or a communication connection via a wire. A wireless communication connection can be a Bluetooth communication connection as is known to a person skilled in the art. Of course, other types of wireless communication connections can also be used, for example with radio frequency signals, infrared signals and the like.

The signals sent from the first microchip 12 to the second microchip 21 may include an identification code. This identification code can be read and recognized by the receiving second microchip 21 to verify whether the received signals are indeed from the shoe 10 associated with the portable control unit 20, and not from another shoe, e.g. from a shoe 20 of another runner who happens to pass.

The second microchip 21 is adapted to calculate an indication for the mass (body weight) of the runner, based on the received force signal F and acceleration signal A.

The accelerometer 13 measures the acceleration of the shoe 10 when the shoe 10 hits the ground. The insertion body 11 with force sensor collects values of the force (pressure) exerted by the body on the ground, which results in the force signal F.

It will be appreciated that the force signal F is not a direct indication of the mass of the runner, because the force exerted by the runner on the insert body 11 with a force sensor is also influenced by the impact of the shoe 10 on the ground. However, the acceleration signal A can be used to compensate for this impact, because the acceleration signal A is an indication of this impact. By applying a known formula that describes the relationship between force and acceleration (F - Μ · (A + g)), where F is the force; A is the acceleration measured by the accelerometer 13; g the gravity coefficient (g »10 m / s2) and M the mass, the second microchip 21 can calculate an indication for the mass M of the runner.

It can be assumed that the force F and the acceleration A operate essentially in the same direction, i.e. in the direction of the gravity coefficient g.

It will be appreciated that the insert body 11 with force sensor may not detect the total force exerted on the ground by the runner. This can be caused by the fact that the piezo element 14 does not cover the entire surface of the foot. 10 The human body is also a flexible object and therefore its center of gravity changes as the body moves. During running, the center of gravity may not be in line with the force sensor of the insert body 11 with force sensor, for example in the heel of the shoe. As a result, the data collected by the insertion body 11 with force sensor form part of a resultant force. To compensate for this, the coordinates of the center of gravity and the direction of the center of gravity relative to the heel when the force is applied are needed.

To compensate for such errors, the initial weight of the runner can be entered into the second microchip 21 just before the start of a run. Assuming that no significant mass decrease occurs within the first few minutes of a run, this initial period can be used to calculate a correction factor that can be applied when the runner mass indication is calculated to compensate for such errors . This will be explained later.

The second microchip 21 can be arranged to display this information about the body weight of the runner while running on the display window 22. To exclude fluctuations of the indication for the body weight per step which occur as a result of measurement errors and the like , the microchip 21 may be adapted to calculate an average body weight value over a predetermined period of time, or over a predetermined number of footsteps. The information displayed may be based on a calculated moving average (running 30 average).

The calculated body weight indication can be displayed directly on the display window 22. However, in order to make the system more intuitive and easier to use, the second microchip 21 may be adapted to calculate and display the weight decrease by comparing the measured and calculated indication of the weight during running with the initial weight of the runner (determined at the start of the run).

In order to make the system even more intuitive and easier to use, the second microchip 21 can be further adapted to calculate and display the amount of moisture that a runner must drink, for example expressed in kilograms, in (milli-) liters, or in number of units, one unit being a predetermined amount of moisture corresponding, for example, to a single cup of water dispensed at a feeding station.

10

On the basis of the above, it will therefore be recognized that the system as it is presented here can function during a first setup phase and during an actual control phase. During the setup phase, data such as the body weight of the runner is read in and initial measurements are performed that result in a correction factor. During the control phase, the body weight of the runner is checked and measurement results and warnings are displayed. In FIG. 4 shows a flow diagram schematically. The system can be started during a first action 120. Thereafter, the system begins to perform the setup phase during action 130, which is explained later in this document with reference to FIG. 5. After the setup phase has ended, the system proceeds to perform the check phase at action 140, which is explained later in this document with reference to FIG. 6.

Adjustment phase 25 In FIG. 5 shows a flow diagram of the adjustment phase. The setup phase is started with a first action 131.

In a subsequent action 132, the initial body weight Mj '(e.g., 75 kg) of a runner can be read in by the second microchip 21. The microchip can be arranged to prompt the user to enter his or her initial body weight via display window 22. The user can enter this initial body weight Mjn by using buttons arranged on the portable monitor 20 (not shown) or via wireless transmission, for example received from a scale SC.

9

Once the initial body weight Mjn has been read in and stored in memory (not shown), the second microchip 21 can take measurements during a predetermined period of time (e.g., 2 minutes) or during a predetermined number of steps (e.g., 100 steps) during a subsequent action 133. With this action 133, the second microchip 21 receives a force signal F and an acceleration signal A from the first microchip 12.

On the basis of the received force signal F and the acceleration signal A, a number of indications Mj for the body weight of the runner are determined during an action 134, where i = 1, 2, 3, ... This can be done by peak values of the force signal 10 Fpeak, i to be determined, for example Fpeak, i - 1500 N.

The second microchip 21 can be arranged such that it is activated by peaks of the force signal F. According to a variant, the second microchip 21 can be arranged such that it is activated by peaks of the acceleration signal A.

It can be assumed that each peak of the force signal F represents a single step of the runner, because the peak value is probably caused by the impact force of the shoe 10 that hits the ground. In this way, information can be collected from each step. This approach also prevents information from being used when shoe 10 is not in contact with the ground. Moreover, because the device is activated by a peak value, all successive measurements are made at a comparable time during the cycle of each step, whereby successive measurements can easily be compared.

From the acceleration signal A the corresponding acceleration value Apeak, i is determined, i.e. the value of the acceleration at the moment of the peak value Fpeak, i. The acceleration can for example be Apeak, i = 20 m / s2. By applying F = 25 Μ (A + g), a value for Mi of 50 kg is obtained.

This can be repeated during the predetermined period of time or the predetermined number of steps (i.e. a predetermined number of peak values of the force signal F). At action 135, it is determined whether the setting phase can be ended, i.e. whether the predetermined period of time has elapsed or the predetermined number of steps has been taken. If this is not the case, the second microchip 21 returns to action 133. If this is the case, the second microchip 21 continues to perform action 136. It is assumed that no substantial decrease in body weight occurs during the adjustment phase. .

10

In this action 136, the average for the obtained results for Mj, in an action 134, is calculated, resulting in an average value for Mav, where: * trax

During a subsequent action 137, a coordination factor C is determined, to compensate for differences between the initial actual body weight Mj of the runner and the measured body weight Mav. The correction factor can be C =

Mjn / Mav. According to the given example, this can result in a correction factor C of 75/50 = 1.5. The correction factor C compensates for all types of measurement errors.

The microchip 21 can also be adapted to ask the user during the setting phase via display window 22 to enter the amount of liquid that is present in a cup that is distributed at the feeding stations. This amount can be expressed in weight (e.g. 0.2 kg) or in volume (e.g. 200 ml). The user can enter this information via buttons mounted on the portable monitor 20 (not shown) or via wireless transmission.

Control phase

After the setting phase has ended, the second microchip 21 can start performing the checking phase in an action 141. In a following action 142 of the checking phase, the second microchip 21 reads the force signal F and the acceleration signal A from the first microchip 12. in the shoe 10.

In an action 143, the second microchip 21 calculates an indication of the body weight Mj on the basis of the received force signal F and acceleration signal A, where j = 1,2,3, ... This can be done in many different ways, for example, such as 25 described above with regard to action 134, ie by detecting peak values of the force signal F and determining corresponding values of the acceleration signal A.

In a subsequent action 144, the calculated indication for the body weight Mj is corrected on the basis of the predetermined correction factor C, which results in a corrected indication for the body weight Mj, = C · Mj.

11

To rule out fluctuations that may occur as a result of an unstable running technique of the runner, measurement errors, measurement fluctuations due to hills, bends and the like, an averaging action 145 can be performed. With this averaging action 145, the average of a number of specific indications for body weight can be taken. The calculation of a moving average can be done by calculating an average value based on a predetermined number of latest results, for example based on the last 100 measurements. The displayed results can, for example, be updated once per minute or the like, to prevent the displayed results from constantly showing fluctuations, as a result of which the displayed results are difficult to interpret by the runner.

In a final action 146, the results can be performed, for example, by displaying the calculated body weight in display window 22.

The second microchip 21 may be adapted to display the average body weight indication determined at action 145. However, the second microchip 21 can also be designed so that it represents the weight decrease, i.e. it calculates and displays the difference between the determined average indication for body weight and the initial body weight M1 '.

According to another variant, the second microchip can also be adapted to calculate and display the amount of moisture that the runner should drink, for example at the next feeding post. This amount can be expressed in weight (e.g.

0.4 kg) or in volume (e.g. 400 ml).

In the case that the microchip 21 has read in during the setting phase the amount of liquid present in a standard cup that is used during the run, for example the cups that are distributed at the feeding stations, the second microchip 21 can also change the number of cups that the user must give drink as output. The purpose of displaying volume units is to provide a more intuitive way to measure fluid intake.

So if the runner from the example given above now weighs 74.6 kg, the second microchip can display 74.6 kg as the current weight of the runner, or it can represent a weight decrease of 0.4 kg (compared to the initial 12 body weight of 75 kg), or it can display a recommended fluid intake of 400 ml, or it can display a recommended number of cups of 2 (400/200 = 2).

It will be appreciated that the second microchip 21 may also be arranged to give a warning when a predetermined threshold of moisture loss 5 is detected. This threshold can be adjustable by the user. The threshold can for example be 0.5 kg. So in case the second microchip has determined a moisture loss of more than 0.5 kg, an additional warning is given, for example a visual warning (flashing light) or an audible warning (beep).

10 Control system

According to an embodiment, the portable control unit 20 may also be adapted to carry out this information about the decrease in body weight, or the recommended amount of moisture, at a remote control device 50, as in FIG. 7 can be seen.

The portable control device 20 can output this information via any kind of suitable communication connection, such as a wireless communication connection. The communication connection can be realized by using radio frequency signals, infrared or Bluetooth or the like.

Such a monitoring device 50 can be placed along a route of a run or a running track and can be managed by the organizers of the run. The control device 50 may comprise a suitable input device 51 and a processing unit 52. In addition, the control device 50 may comprise a memory 53 which includes programming rules that can be read and executed by the processing unit 52, whereby the processing unit 52 can perform the functionality described here. The memory 53 can be any kind of suitable computer memory known to a person skilled in the art, such as a RAM, ROM, EEPROM and the like.

The processing unit 52 may be adapted to receive this information via the input device 51. In addition to information about the measured weight decrease or the moisture loss of that particular runner, the information may comprise an identification code associated with those specific runners.

The processing unit 52 may further be arranged to compare the received information with a predetermined threshold and to issue a warning via a warning unit 54 when a particular runner has a moisture loss 13 that is greater than this predetermined threshold. The warning unit 54 may be a display unit that displays the identification and moisture loss of the particular runner. The warning unit 54 can also be designed to give an audible warning.

On the basis of the identification code received, the runner who has a moisture loss higher than the threshold can be traced and he can be offered additional moisture or he can be removed from the barrel.

Further remarks In all the above-mentioned embodiments, an insert body 11 with force sensor, a first microchip 12 and an accelerometer 13 is described, which are arranged in a single shoe 10. However, it will be appreciated that a runner can also wear a second shoe that is provided with a similar functionality. The second microchip 21 can then be arranged to receive these signals from both the first and the second shoe. According to such an embodiment, more data is received by the system and more accurate calculations can be performed. Errors can also be excluded as a result of an unstable walking technique, for example a walking technique in which more weight is placed on one foot than the other. In addition, it is possible that it is more comfortable for a runner to wear two identical shoes with the same inserts and with the same weight.

Similarly, a second shoe 10 can be provided which does not comprise an insert body 11 with force sensor etc., but which comprises a compensating weight (for example provided by an insole) as a counterbalance to the insert body 11 with force sensor, the accelerometer 13 and the microchip 12 in the first shoe 10, giving the runner a more stable feeling.

It will be appreciated that all components described in the above embodiments can be made of lightweight material to make running as comfortable as possible.

It will further be appreciated that the adjustment phase described above is an optional phase, which is mainly used to calculate a correction factor C. However, this correction factor C can be a standard correction factor that is stored in memory, for example, during a previous time that the system was used. In the case that 14 the measurements of the insert body 11 with force sensor are sufficiently accurate, the correction factor can be skipped (or set to one).

The initial weight Mi 'of the runner may be known from a previous time the system has been used or it may have been determined during a predetermined first period of time or number of steps with the standard correction factor, if necessary.

According to the embodiments described above, the majority of the functionality is performed by the second microchip 21. However, it will be appreciated that many or all of the calculation steps can also be performed by the first microchip 12. In fact, the entire system may be included in a single unit attached to the shoe, including the display window 22; according to such an embodiment, only a single microchip is provided.

So before using the system, the runner can place the insert body 11 with force sensor in his or her shoe (s) and carry the portable monitor 20. The runner weighs himself minutes before the run and enters his or her weight into the portable monitor 20. The runner can also enter the amount of moisture that is offered in each cup during the run or that is distributed at the feeding stations.

During the run, the portable monitor 20 informs the runner about at least one of the following variables: 20 - his or her actual body weight, - decrease in body weight, - recommended fluid intake in amounts of fluid ((milli) liters or kg), - recommended fluid intake in number of cups.

During the run, the second microchip 21 (or the first microchip 12) calculates and informs him or her about the loss of fluid or the body weight of the runner. The second microchip 21 can also alert the runner when he or she has lost too much moisture and comes close to a dangerous level of dehydration.

With the help of Bluetooth receivers placed along the route of the loop, the organization can stay informed of the hydration state of each of the runners 30 and be notified when a runner is at risk of either dehydration or hyponatremia.

A hyponatremic patient or runner is someone who suffers from a condition of severe excessive fluid intake when larger amounts of fluid have been ingested than necessary or can then absorb his or her body during the run. Hyponatremia can have fatal consequences for a runner, including brain and lung edema and ultimately death. Potentially severe hyponatremia in runners is accompanied by an increase in weight. A device that could provide information about body weight and hydration status during the run can tell whether the runner is drinking too little or too much and help him or her to follow an adequate hydration pattern. It will therefore be appreciated that the embodiments described above can also be used to inform and / or warn a runner about possible hyponatremia by calculating and displaying a possible weight increase during the run.

It will be appreciated that the embodiments described above can be applied to all types of sports where the user's feet are in contact with the ground at least part of the time, such as running, walking, speed walking, football, cricket, etc.

The descriptions given above are all intended as an example and not as a limitation. Therefore, it will be apparent to those skilled in the art that modifications may be made to the invention as described herein without departing from the scope of the claims set out below.

2000197

Claims (24)

A system for determining weight decrease comprising at least one microchip (12, 21), characterized in that the at least one microchip (12, 21) is adapted to receive a force signal (F) from an insert body ( 11) with force sensor and adapted to receive an acceleration signal (A) from an accelerometer (13), the force signal (F) being an indication of a force exerted on the ground by a user and the acceleration signal (A) is an indication for the acceleration of the user when it hits the ground, the at least one microchip (12,21) being adapted to calculate an indication for a weight (M) of the user based on the received force signal (F) and acceleration signal (A). The system of claim 1 wherein the microchip (12, 21) calculates the indication for the user's weight (M) by applying the formula F = M (A + g), where F is the force signal, A is the force signal acceleration signal, g the gravity coefficient and M the indication for the user's weight. A system according to any one of the preceding claims, wherein the microchip (12, 21) is adapted to detect a peak value of one of the force signal 20 (F) or the acceleration signal (A) and the weight indication (M) is calculated based on the detected peak value of the force signal (F) or the acceleration signal (A). A system according to any one of the preceding claims wherein the microchip 25 (12, 21) is adapted to apply a correction factor (C) to the determined indication for the weight (M) of the user. 5. System as claimed in claim 4, wherein the microchip (12,21) is adapted to receive an initial body weight (Mm) from the user and to determine the correction factor (C) by the determined indication for the weight (M ) that was determined during an initial setup phase to be compared with the initial body weight (Min). 2000197 The system of claim 5 wherein the correction factor (C) is C = Min / M, where Min is the initial body weight and M is the body weight determined during the adjustment phase. A system according to any one of the preceding claims, wherein the system comprises an output device for performing at least one of the weight indication (M), the difference between the weight indication and the initial body weight (Mjn), a recommended moisture absorption expressed in kilograms, liters or units, each unit representing a predetermined amount of moisture. 10 A system according to any one of the preceding claims, comprising an inlay body (11) with force sensor that is in the form of an insole and which is suitable for placing in a shoe (10) comprising at least one force sensor element (14), which is adapted to generate the force signal (F), which is an indication of the force exerted by a user on the insertion body (11) with force sensor. A system according to any one of the preceding claims, comprising an accelerometer (13) which is adapted to measure an acceleration signal (A). 20 A system according to any one of the preceding claims, comprising a portable control unit (20) comprising the at least one microchip (21). 11. Inlay body (11) with force sensor in the form of an insole and capable of being placed in a shoe (10) comprising at least one force sensor element (14), which is adapted to generate a force signal (F), which is an indication of the force exerted by a user on the insertion body (11) with force sensor. A force sensor insert body (11) according to claim 11, wherein at least one force sensor element (14) is disposed in a heel portion of the force sensor insert body (11). The insertion body (11) with force sensor according to one of claims 11-12, wherein the force sensor element (14) is a piezo element (14). 14. Insertion body (11) with force sensor according to one of claims 11-13, wherein the insertion body (11) with force sensor further comprises a microchip (12). 15. Inlay body (11) with force sensor according to one of claims 11-14, wherein the inlay body (11) with force sensor further comprises an accelerometer (13) which is adapted to measure an acceleration signal (A) indicative of the acceleration of the insert body (11) with force sensor. Shoe (10) characterized in that the shoe (10) comprises a microchip (12) and an accelerometer (13), the first microchip (12) being adapted to receive a force signal (F) from an insert body ( 11) with force sensor and an acceleration signal (A) from the accelerometer (13). Shoe (10) according to claim 16, wherein the shoe (10) further comprises an insertion body (11) with force sensor according to one of claims 11-15. A pair of shoes comprising a first shoe (10) and a second shoe (10) according to any of claims 16-17. 19. Pair of shoes comprising a first shoe (10) according to any one of claims 16 to 17 and a second shoe, which comprises a compensating weight, as a counterbalance to the first shoe (10). A portable control unit (22) comprising a microchip (21) characterized in that the microchip (21) is adapted to receive a force signal (F) indicative of a force applied by a user on the ground is applied and an acceleration signal (A) indicative of the acceleration of the insertion body (11) with force sensor, the microchip (21) being adapted to calculate an indication of the weight (M) of a user on the basis of of the received force signal (F) and the acceleration signal (A). A portable control unit (20) according to claim 20, wherein the microchip (21) is adapted to prepare the indication for the weight (M) of the user by applying the formula F = Μ (A + g) , where F is the force signal, 5. the acceleration signal, g the gravity coefficient and M the indication for the user's weight. A portable control unit (20) as claimed in any one of claims 20 to 21 wherein the microchip (21) is adapted to apply a correction factor (C) to the determined indication for the weight 10 (M) of the user. The portable control unit (20) of any one of claims 20 to 22, wherein the first microchip (21) is adapted to receive an initial body weight (Mjn) from the user and determine the correction factor (C) by the 15 certain indication for the weight (M) determined during an initial adjustment phase, to be compared with the initial body weight (Min). The portable control unit (20) of claim 23, wherein the correction factor (C) is C = Mjn / M, wherein Mjn is the initial body weight and 20. the body weight determined during the adjustment phase. 2000197