JP2823841B2 - Body sway meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center of gravity sway meter and, more particularly, to a center of gravity sway meter having an effective data calculation function when a subject falls down during the measurement of the center of gravity.

[0002]

2. Description of the Related Art Conventionally, when measuring the center of gravity of a subject while standing still using a body sway meter, the subject rides on a detection table for measurement for 60 seconds or 30 seconds. It is measuring a fixed time such as.

[0003]

However, in the above-mentioned conventional center of gravity sway meter, when the center of gravity of the subject is measured when the subject is standing still, the subject is placed on a measuring table. Riding the vehicle and measuring a predetermined time, such as 60 seconds or 30 seconds, had the following problems.

When actually measuring a sick person, it sometimes happens that the sick person falls down or staggers in the measurement and gets off the detection table. In such a case, it is necessary for the measurer to shorten the previously set measurement time and perform the measurement again, which has been troublesome for the measurer.

[0005] An object of the present invention is to measure the validity of the data obtained by the previous measurement when the sick person falls off the detection table due to falling or wandering during the measurement of the center of gravity sway for less than the specified time. An object of the present invention is to provide a center of gravity sway meter having a function of performing an operation using a portion and outputting an inspection result.

[0006]

[Means for Solving the Problems] Do not ride on the same straight line 3
A detection table for detecting the distribution of the load of the subject by the load detection means arranged at a point, a measurement time setting means for setting a measurement time of the sway of the center of gravity, and each load arranged on the detection table detection
The load detected by the means is a predetermined value of the weight value of the subject.
When the value is not less than the ratio, within the measurement time set by the measurement time setting means, the center of gravity of the subject is sequentially determined from the distribution of the load detected by the detection table as a center of gravity calculation result by a predetermined calculation process. Calculating means for calculating, a center of gravity storing means for sequentially storing the center of gravity calculation results sequentially obtained by the calculating means, and a change in the center of gravity of the subject is analyzed based on the center of gravity calculation results sequentially stored in the center of gravity storing means Analyzing means, which comprises:
Before the measurement time set by the setting means elapses,
Detected by the load detecting means disposed on the detection table.
Is less than or equal to a predetermined percentage of the subject's weight.
In the case where the calculation has been completed, the arithmetic processing by the arithmetic means is started.
Until the weight of the subject becomes less than the specified percentage
Effective measurement time to set an effective measurement time less than the elapsed time of
Setting means for setting the measurement time.
Within the measurement time set by the
Within the effective measurement time set by the measurement time setting means.
The trajectory length of the movement of the center of gravity is stored in the center of gravity storage means.
Calculated as the unit time trajectory length based on the center of gravity calculation result,
Evaluation criteria of unit time trajectory length prepared for each measurement time in advance
From the data group, the set measurement time or effective measurement
An evaluation reference data group corresponding to time is extracted, and the calculated
Unit time trajectory length and the extracted evaluation criterion data group
The method is characterized in that the sway of the subject's center of gravity is evaluated based on the difference between the two .

According to the center of gravity sway meter according to the first aspect of the present invention, load detection is provided at three points not on the same straight line.
A detection stage for detecting the distribution of the load of the subject by means a measurement time setting means for setting the body sway of the measurement time, the
Detected by each load detection means arranged on the detection table
When the load is equal to or greater than a predetermined percentage of the subject's weight
To, the measurement within the measurement time set by the time setting means, and sequentially obtains operation means as the centroid calculation result by the center of gravity of the predetermined arithmetic processing of the subject from the distribution of the load detected by the detection stage, the operation A center-of-gravity storage means for sequentially storing the center-of-gravity calculation results sequentially obtained by the means; and analysis means for analyzing a change in the center of gravity of the subject based on the center-of-gravity calculation results sequentially stored in the center-of-gravity storage means. The effective measurement time setting means in the body sway meter
Before the measurement time set by the interval setting means elapses
The load is detected by the load detecting means disposed on the detection table.
The weight of the subject is less than or equal to a predetermined percentage of the subject's weight.
In the event that this happens, the arithmetic processing by the arithmetic means starts.
The value is less than or equal to a predetermined percentage of the subject's weight value since the start
Set an effective measurement time shorter than the elapsed time until
The means is a measurement set by the measurement time setting means.
Within the time or set by the measurement time setting means
The trajectory length of the movement of the center of gravity within the effective measurement time
Unit time based on the center of gravity calculation result stored in the heart storage means
Calculated as the length of the inter-locus
From the evaluation reference data group of the time locus length,
Evaluation reference data corresponding to measurement time or effective measurement time
Extracting a group, and calculating the unit time trajectory length and extracting
Of subject's center of gravity based on the difference from the evaluated evaluation data group
Evaluate shaking.

[0008] Therefore, in the past, when the subject got off the detection table before the designated measurement time, it was possible to omit the measurer from performing the measurement again, and the work load on the measurer was reduced. Can be reduced. As a result, the work efficiency of the measurer in charge of the sway meter can be improved, and the reliability of the sway meter can be improved.

In this case, as in the second aspect of the present invention, in the body sway meter according to the first aspect, the evaluation reference data group prepared for each of the measurement time or the effective measurement time includes the evaluation reference data group of the subject. It is effective that the unit time trajectory length prepared for each measurement time is obtained from the center-of-gravity calculation result measured in advance based on measurement conditions such as gender, age, and measurement time.

According to the gravity center sway meter of the second aspect of the present invention, the evaluation reference data group prepared for each of the measurement time or the effective measurement time is used for measuring the gender, age, and measurement time of the subject. Pre- measured center of gravity performance based on conditions
Unit time trajectory obtained from the calculation result and prepared for each measurement time
Long.

Accordingly, criteria data set, because the age and sex is determined based on the centroid data obtained from a number of different subjects, calculated from the centroid calculation result stored in the measurement time or the valid measurement time Unit time gauge
The evaluation reference data for evaluating the trace length is sufficiently reliable, and the effective data analysis process is sufficiently reliable.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 12 show an embodiment of a center of gravity sway meter to which the present invention is applied.

First, the configuration will be described.

FIG. 1 is a block diagram showing a configuration of a main part of a gravity center sway meter 1 of the present embodiment. In FIG. 1, the sway meter 1 includes a detection table 2, a signal amplifier 3, an A / D converter 4, an arithmetic device 5, a display device 6, and a printing device 7.

The detection table 2 includes load sensors S1 to S3 for detecting a load at each vertex when the subject is put on the detection table 2, and the load sensors S1 to S3 detect the load. Each load is output to the signal amplifier 3 as a load detection signal.

The signal amplifier 3 amplifies each load detection signal to a predetermined level and converts the load detection signal input from the detection table 2 into a signal level that can be processed by each subsequent block. 4 is output.

The A / D converter 4 converts each load detection signal input from the signal amplifier 3 into digital data which can be processed by the arithmetic unit 5, and converts each load detection signal into predetermined load data. The data is converted and output to the arithmetic unit 5.

The arithmetic unit 5 has a CPU (Central)
Processing Unit), ROM (Read)
Only M-memory), RAM (Random
Access Memory), a hard disk, and the like, and have the functions shown in FIGS. FIG. 2 is a diagram showing a functional configuration of the arithmetic unit 5. In FIG. 2, the arithmetic unit 5 detects a load from each load data input from the A / D converter 4, and detects the load. A center-of-gravity calculation function for calculating the center of gravity from the distribution state of each of the applied loads ; a center-of-gravity calculation result storage function for storing the calculated center-of-gravity calculation result; an analysis function for analyzing the stored center-of-gravity calculation result; It has a display function of displaying the result on the display device 6 and a printing function of printing the analysis result on the printing device 7.

FIG. 3 is a diagram showing details of the analysis function of FIG. In FIG. 3, the arithmetic unit 5 takes in the center-of-gravity calculation result stored in the RAM, extracts an evaluation parameter for each measurement time stored in advance in the hard disk, and a function for extracting the evaluation parameter. An evaluation reference value selection function for selecting an evaluation reference value corresponding to the previously acquired center-of-gravity calculation result from parameters, and an evaluation execution function for executing evaluation of the center-of-gravity calculation result based on the selected evaluation reference value And

When measuring the center of gravity, if the subject falls off the detection table 2 during the designated measurement time (20 seconds, 30 seconds, 60 seconds), the arithmetic unit 5 measures the measurement time up to that time. An analysis process, which will be described later, for extracting and evaluating valid data from the data obtained during the process is executed.

As the display device 6, a CRT (Cathode Ra) is used.
y Tube) is used, and an analysis result obtained by analyzing the calculation result of the center of gravity by the calculation device 5 is displayed. The printing device 7 prints an analysis result obtained by analyzing the center-of-gravity calculation result by the calculation device 5, and the like.

Next, the operation of this embodiment will be described.

First, the effective data analysis processing executed by the arithmetic unit 5 will be described with reference to the flowchart shown in FIG.

In the effective data analysis process described below, the subject on the detection table 2 is a male, and the conditions for measuring the center of gravity are as follows: open eyes (opened eyes), closed feet (close both feet and stand still). In a standing state, the sampling frequency of the center of gravity value is set to 20 Hz, and the measurement time is set to, for example, 10 seconds, 20 seconds.
It is assumed that the setting is seconds, 30 seconds, and 60 seconds.

When the load of the subject on the detection table 2 is detected by the load sensors S1 to S3 and a load detection signal is output to the signal amplifier 3, the load is amplified to a predetermined level and A / D converted. Output to the container 4. In the A / D converter 4, each load detection signal input from the signal amplifier 3 is converted by the arithmetic unit 5.
In order to perform A / D conversion into digital data that can be processed by the, each load detection signal is converted into predetermined load data and output to the arithmetic unit 5.

In FIG. 4, a load value is fetched from each load data input from the A / D converter 4 (step S1), and whether the load value is valid or not is determined by the subject at the start of measurement. It is determined based on whether the weight is 30% or more (step S2). If the load value is valid, the center of gravity is calculated from the load value and stored in the RAM (step S3), and the time (T) from the start of the measurement until the load value is captured is recorded (step S4).

Next, it is determined whether or not the measurement time has ended based on whether or not the subject has got off the detection table 2 during the designated measurement time (step S5). If the measurement time has not elapsed, that is, if the subject is on the detection table 2, the process returns to step S1 to return to the load value capturing process. If the measurement time has ended, that is, if the subject has got off the detection table 2 during the designated measurement, the time until the end of the measurement is determined (step S6).

If the time until the end of the measurement is shorter than "10 seconds", it is determined that the measurement has failed (step S).
7). If the time until the end of the measurement is “10 seconds” or more and shorter than “20 seconds”, R
It is determined that the center-of-gravity calculation recording result stored in the AM is valid (step S8). Then, of the evaluation parameters for each measurement time stored in the hard disk in advance, the measurement time 1
An evaluation parameter corresponding to 0 seconds is extracted, and the value of the center-of-gravity calculation result is evaluated based on the reference value plotted by age in the evaluation parameter (step S9).

FIGS. 5 and 6 show specific examples of evaluation parameters when the effective measurement time is 10 seconds.

FIG. 5 shows the unit time trajectory length (measurement conditions: male, eye open, foot closed, sampling frequency (20 Hz), measurement time (10 seconds)) for each age frame shown in the table. The average of the values is defined as “mean + 2SD (standard deviation)”, “mean + SD”, “mean”, “mean−SD”,
It is the table | surface calculated | required as "average-2SD". The graph of FIG. 6 is obtained by plotting each value in the table of FIG.

Therefore, in step S9, the center of gravity calculation result stored in step S3 and an evaluation reference value corresponding to the center of gravity calculation result are selected from the table shown in FIG. That is, the evaluation reference value corresponding to the age of the subject is selected, and the center-of-gravity calculation result stored in step S3 is stored.
Based on the trajectory length of the center of gravity
Unit time trajectory length calculated and the selected evaluation
Based on the difference from the reference value, the subject's center of gravity sway is evaluated,
The result of the evaluation is displayed on the display device 6 or printed out from the printing device 7 (step S16), and the process is terminated.

In step S6, if the time until the end of the measurement is equal to or longer than "20 seconds" and shorter than "20 seconds", it is determined that the center-of-gravity calculation record result stored in the RAM by the measurement time of 20 seconds is valid. (Step S10). Then, an evaluation parameter corresponding to the measurement time of 20 seconds is extracted from the evaluation parameters for each measurement time stored in the hard disk in advance, and the center of gravity is calculated based on the reference values plotted by age in the evaluation parameters. The value of the result is evaluated (step S11).

FIGS. 7 and 8 show specific examples of evaluation parameters when the effective measurement time is 20 seconds.

FIG. 7 shows the unit time trajectory length (measurement conditions: male, eye open, foot closed, sampling frequency (20 Hz), measurement time (20 seconds)) for each age frame shown in the table, and the measurement. The average of the values is defined as “mean + 2SD (standard deviation)”, “mean + SD”, “mean”, “mean−SD”,
It is the table | surface calculated | required as "average-2SD". The graph of FIG. 8 is obtained by plotting each value of the table of FIG.

Therefore, in step S11, the center-of-gravity calculation result stored in step S3 and an evaluation reference value corresponding to the center-of-gravity calculation result are selected from the table shown in FIG. That is, an evaluation reference value corresponding to the age of the subject is selected, and the center of gravity calculation result stored in step S3 is selected.
Based on the result, the path length of the center of gravity moved per unit time
Unit time trajectory length calculated as
The sway of the subject's center of gravity is evaluated based on the difference from the value reference value, and the evaluation result is displayed on the display device 6 or printed out from the printing device 7 (step S16).
This processing ends.

In step S6, if the time until the end of the measurement is equal to or longer than "30 seconds" and shorter than "60 seconds", it is determined that the center-of-gravity calculation record result stored in the RAM by the measurement time of 30 seconds is valid. (Step S12). Then, an evaluation parameter corresponding to the measurement time of 30 seconds is extracted from among the evaluation parameters for each measurement time stored in the hard disk in advance, and the center of gravity is calculated based on the reference values plotted by age in the evaluation parameters. The value of the result is evaluated (step S13).

Here, specific examples of the evaluation parameters when the effective measurement time is 30 seconds are shown in FIGS. 9 and 10. FIG.

FIG. 9 shows the unit time trajectory length (measurement conditions: male, eye open, foot closed, sampling frequency (20 Hz), measurement time (30 seconds)) for each age frame shown in the table, and the measurement. The average of the values is defined as “mean + 2SD (standard deviation)”, “mean + SD”, “mean”, “mean−SD”,
It is the table | surface calculated | required as "average-2SD". The graph of FIG. 10 is obtained by plotting each value in the table of FIG.

Therefore, in step S13 , the center-of-gravity calculation result stored in step S3 and an evaluation reference value corresponding to the center-of-gravity calculation result are selected from the table shown in FIG. That is, an evaluation reference value corresponding to the age of the subject is selected, and the center of gravity calculation result stored in step S3 is selected.
Based on the result, the path length of the center of gravity moved per unit time
Unit time trajectory length calculated as
The sway of the subject's center of gravity is evaluated based on the difference from the value reference value, and the evaluation result is displayed on the display device 6 or printed out from the printing device 7 (step S16).
This processing ends.

If it is determined in step S6 that the time until the end of the measurement is the maximum "60 seconds", it is determined that the center-of-gravity calculation recording result stored in the RAM by the measurement time of 60 seconds is valid (step S14). ). Then, an evaluation parameter corresponding to the measurement time of 60 seconds is extracted from among the evaluation parameters for each measurement time stored in the hard disk in advance, and the center of gravity is calculated based on the reference values plotted by age in the evaluation parameters. The value of the result is evaluated (step S15).

Here, specific examples of the evaluation parameters when the effective measurement time is 60 seconds are shown in FIG. 11 and FIG.

FIG. 11 shows the unit time trajectory length (measurement conditions: male, eye open, foot closed, sampling frequency (20 Hz), measurement time (60 seconds)) for each age frame shown in the table, and the measurement. The average of the values is defined as “mean + 2SD (standard deviation)”, “mean + SD”, “mean”, “mean−SD”,
It is the table | surface calculated | required as "average-2SD". The graph of FIG. 12 is obtained by plotting each value in the table of FIG.

Therefore, in step S15 , the center-of-gravity calculation result stored in step S3 and an evaluation reference value corresponding to the center-of-gravity calculation result are selected from the table shown in FIG. That is, an evaluation reference value corresponding to the age of the subject is selected, and the center of gravity calculation stored in step S3 is performed.
Based on the result, the trajectory of the center of gravity moved per unit time
The unit time trajectory length calculated as the length and the selected
Based on the difference from the evaluation reference value, the sway of the subject's center of gravity is evaluated, and the evaluation result is displayed on the display device 6 or printed out from the printing device 7 (step S16).
This processing ends.

As described above, in the body sway meter 1 according to the present embodiment, if the subject falls off the detection table 2 before the end of the designated measurement time, the arithmetic unit 5 applies the load to that point. The effective time of measuring the value is 10 seconds, 20 seconds, 30 seconds,
Judgment is made in four stages of 60 seconds, and the center-of-gravity calculation results stored within the effective time are extracted from the evaluation parameters for each measurement time stored in the hard disk in advance, and the corresponding evaluation parameters are selected from the extracted evaluation parameters. The evaluation reference value was selected to evaluate the center-of-gravity calculation result.Conventionally, if the subject got off the detection table before the designated measurement time, the measurer would repeat the measurement. This can be omitted, and the work load of the measurer can be reduced.

As a result, the work efficiency of the measurer in charge of the sway meter can be improved, and the reliability of the sway meter can be improved.

In the above embodiment, in the effective data analysis process, the subject on the detection board 2 is a male,
The center of gravity measurement conditions are as follows: with the eyes open (the eyes are open), with the feet closed (both feet closed and standing still), the sampling frequency of the center of gravity value is 20 Hz, and the measurement time is, for example, 10
Although set to seconds, 20 seconds, 30 seconds, and 60 seconds, the subject may be a woman, and the center of gravity sway meter of the present invention is applicable even if the center of gravity measurement conditions are other. Of course.

The tables and graphs shown in FIGS. 5 to 12 are merely examples, and different tables and graphs can be obtained according to changes in women and measurement conditions. Based on these different tables and graphs, FIG. The center-of-gravity calculation result measured and calculated under the same different measurement conditions can be evaluated.

The tables and graphs shown in FIGS. 5 to 12 are obtained based on the center-of-gravity measurement data measured from many subjects, and the center-of-gravity calculation evaluated in the present embodiment is performed. The result is sufficiently reliable, and the above-mentioned constant valid data analysis processing is sufficiently reliable.

[0050]

According to the center of gravity sway meter of the first aspect of the present invention, conventionally, when the subject gets off the detection table before the designated measurement time, the measurer performs the measurement again. This can be omitted, and the work load on the measurer can be reduced. As a result, the work efficiency of the measurer in charge of the sway meter can be improved, and the reliability of the sway meter can be improved.

According to the center of gravity sway meter according to the second aspect of the present invention, since the evaluation reference data group is obtained based on the center of gravity data obtained from a large number of subjects having different ages and genders, the measurement time or the effective time is obtained. The evaluation reference data for evaluating the unit time trajectory length obtained from the center-of-gravity calculation result stored within the measurement time is sufficiently reliable, and the effective data analysis process is sufficiently reliable.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a center of gravity sway meter according to an embodiment of the present invention.

FIG. 2 is a diagram showing a functional configuration of an arithmetic unit 5 in FIG. 1;

FIG. 3 is a diagram showing details of an analysis function block in FIG. 2;

FIG. 4 is a flowchart of a valid data analysis process executed by the arithmetic unit 5 of FIG. 1;

5 is a measurement time 10 used when a measurement time of up to 10 seconds is made valid in the effective data analysis processing of FIG. 4;
The figure which shows an example of the table of the unit time locus length for seconds.

FIG. 6 is a diagram showing a graph in which values in the table of FIG. 5 are plotted.

7 shows a measurement time 20 used when a measurement time of up to 20 seconds is made valid in the effective data analysis processing of FIG. 4;
The figure which shows an example of the table of the unit time locus length for seconds.

8 is a diagram showing a graph in which values in the table of FIG. 7 are plotted.

9 shows a measurement time 30 used when a measurement time of up to 30 seconds is made valid in the effective data analysis processing of FIG. 4.
The figure which shows an example of the table of the unit time locus length for seconds.

FIG. 10 is a view showing a graph in which values in the table of FIG. 9 are plotted.

11 is a measurement time 6 used when a measurement time of up to 60 seconds is made valid in the effective data analysis processing of FIG. 4;
The figure which shows an example of the table of the unit time trajectory length for 0 second.

FIG. 12 is a diagram showing a graph in which values in the table of FIG. 11 are plotted.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 center of gravity sway meter 2 detection table 3 signal amplifier 4 A / D converter 5 arithmetic unit 6 display device 7 printing device

Claims (2)

(57) [Claims] 1. Loads arranged at three points not on the same straight line
Detection and detection stand by weight detecting means for detecting the distribution of the load of the subject, the measurement time setting means for setting the body sway of the measurement time, by the load detecting means disposed in said detection block
Load is greater than or equal to a predetermined percentage of the subject's weight
In this case, within the measurement time set by the measurement time setting means, a calculation means for sequentially obtaining the center of gravity of the subject from a distribution of the load detected by the detection table as a center of gravity calculation result by a predetermined calculation processing, A center of gravity storage means for sequentially storing the results of the center of gravity calculation sequentially obtained by the calculation means; and an analysis means for analyzing a change in the center of gravity of the subject based on the results of the center of gravity calculation sequentially stored in the center of gravity storage means. In the center of gravity sway meter provided, the measurement time set by the measurement time setting means is passed.
Before passing through, the load detecting means arranged on the detecting table
Is less than or equal to a predetermined percentage of the subject's weight
If the value of
Since the processing started, the weight of the subject
Set the effective measurement time that is less than the elapsed time until the value
Further provided is an effective measurement time setting means, wherein the analysis means is set by the measurement time setting means.
Within the specified measurement time or by the measurement time setting means.
Length of the movement of the center of gravity within the effective measurement time set
Is calculated based on the center-of-gravity calculation result stored in the center-of-gravity storage means.
Is calculated as the unit time trajectory length and used in advance for each measurement time.
From the evaluation criterion data group of unit time trajectory length,
Evaluation corresponding to the set measurement time or effective measurement time
Extract a reference data group and calculate the calculated unit time trajectory length
Test based on the difference between
Body sway meter for evaluating the body sway of the elderly. 2. The evaluation reference data group prepared for each measurement time or effective measurement time is measured in advance based on measurement conditions such as the sex, age, and measurement time of the subject .
Unit time prepared for each measurement time, calculated from the center of gravity calculation result
2. The center of gravity sway meter according to claim 1 , wherein the length of the center of trajectory is an inter-track length .