Monitoring system for locomotor activity

• US 4,830,021 A
• Filed: 08/29/1988
• Issued: 05/16/1989
• Est. Priority Date: 08/29/1988
• Status: Expired due to Term

• Current Assignee: William E. Thornton
• Original Assignee: William E. Thornton
• Inventors: Thornton, William E.
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): GETZOW, SCOTT M
• Application Number:
  US07/237,183
• Time in Patent Office: 260 Days
• Field of Search: 128/707, 128/709, 128/700, 128/670, 128/696, 128/774, 128/775, 128/776, 128/777, 128/778, 128/779, 128/780, 128/781, 128/782, 73/172, 272/69, 272/DIG. 6, 340/573, 340/579
• US Class Current: 600/520
• CPC Class Codes: A61B 5/222 combined with detection or measurement of physiological parameters, e.g. heart rate
• CPC Class Codes: A61B 5/337 Playback at speeds other than the recording speed

Abstract

A system for monitoring human locomotor activities over long periods of time by recording acceleration (G_z) of the subject during such time periods, and by then converting acceleration to foot/ground forces (F_Z) of the particular subject by a previously calibrated conversion table relating to that particular subject.

Claims

1. A system for monitoring human locomotor activity including:

acceleration measuring means to be mounted on a subject for measuring accelerations of the subject;

recorder means connected to the accelerometer means for recording data relating to such accelerations;

a data analyzing unit coupled to said recorder and including storage means;

sensor means responsive to locomotor activity of the subject for introducing reference ground force data into said data analyzing unit to be stored in said storage means, said data analyzing unit being responsive to the ongoing acceleration data recorded by said recorder for comparing said ongoing acceleration data with said reference ground force data stored in said storage means for converting the ongoing acceleration data into ongoing ground force data representative of the locomotor activity of the subject.

2. The system defined in claim 1, in which said acceleration measuring means measures vertical accelerations of the subject substantially at the center of gravity of the subject.

3. The system defined in claim 2, in which said ground forces stored in said data analyzing unit represent vertical ground forces.

4. The system defined in claim 1, in which said data analyzing unit includes means for analyzing said acceleration data over successive predetermined time intervals.

5. The system defined in claim 1, and which includes means for causing said acceleration data recorded by said recorder to be introduced into said data analyzing unit at a speed substantially higher than the speed at which it was recorded.

6. The system defined in claim 1, in which said sensor means comprises a treadmill including sensor means responsive to such locomotor activity to generate electric signals representing said ground force data.

7. The system defined in claim 1, in which said ground force data comprises vertical force signals.

8. The system defined in claim 1, and which includes sensor means to be mounted on the subject for generating EKG signals and connected to said recorder means to enable said recorder means to record said EKG signals.

9. The system defined in claim 1, and which includes sensor means to be mounted on the subject to sense the posture of the subject, and means connecting said last-named sensor means to the recorder means for enabling the recording means to record signals related to the posture of the subject.

10. In a system for monitoring human locomotor activity, the combination of:

a data analyzing unit including storage means;

means coupled to said unit for introducing signals to said unit representing acceleration data of a subject over a prolonged time period; and

further means coupled to said unit for introducing signals to said unit representing foot/ground force data of the subject over a short time interval to be stored in said storage means for subsequent comparison with said acceleration data signals for converting ongoing acceleration data signals into foot/ground force signals representative of the locomotor activity of the subject.

11. The combination defined in claim 10, in which said acceleration signals relate to vertical accelerations of the subject;

and said foot/ground force signals represent vertical ground forces of the subject.

12. The combination defined in claim 10, in which said data analyzing unit includes means for analyzing said acceleration data signals and said ground force signals over successive predetermined time intervals.

13. The combination defined in claim 10, in which said acceleration signals represent vertical accelerations of the center of gravity of the subject.