Physical activity measuring system
First Claim
1. A physical activity measuring system for determining an exercise intensity of a user, said system comprising:
- a portable device configured to be carried by the user and including a processor;
a three-axis acceleration sensor attached to said portable device and configured to sense body motions of the user to generate acceleration signals ax, ay, and az in all three directions along x-axis, y-axis, and z-axis, respectively;
an acceleration-exercise intensity relation table storing parameters (α
, β
) representing a generally linear correlation between the exercise intensity and a default standard deviation of the acceleration signals sensed by said sensor; and
an indicator mounted to said portable device for indication of the exercise intensity,said processor including an exercise intensity calculator for determination of an instant exercise intensity (K) of the user based upon the acceleration signals sensed by said sensor,said exercise calculator comprising;
data collecting means for collecting first time-series data of said acceleration signals within a predetermined first time frame (T1);
calculation means for calculating a first standard deviation of the first time series data of the acceleration signals using a predetermined formula defining said default standard deviation in terms of the acceleration signals in said all three directions;
reference means for referencing to said acceleration-exercise intensity relation table to obtain said parameters α
, β
that correspond to said first standard deviation; and
determination means which uses thus obtained parameters (α
, β
) and an equation K=α
·
Sw+β
to determine said instant exercise intensity (K) where Sw is the first deviation of the acceleration signals.
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Accused Products
Abstract
A physical activity measuring system analyzes analyzing body motions of a user to accurately determine the exercise intensity. The system includes a portable device which is adapted to be carried by the user and is equipped with a body sensor and an indicator for indication of the exercise intensity. The body sensor senses the user'"'"'s body motions to give corresponding motion strength. The portable device has a processor which constitutes an exercise calculator which has a predetermined relationship between a default standard deviation of the motion strength and an exercise intensity scale. The exercise intensity calculator collects a time series data of the motion strengths within a predetermined first time frame, obtains a standard deviation of thus collected motion strengths, and converting the standard deviation into an instant exercise intensity within the intensity scale in accordance with the predetermined relationship. The standard deviation with regard to the motion strengths can be well concordant with the exercise intensity, and therefore gives the accurate exercise intensity on a real-time basis.
91 Citations
15 Claims
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1. A physical activity measuring system for determining an exercise intensity of a user, said system comprising:
-
a portable device configured to be carried by the user and including a processor; a three-axis acceleration sensor attached to said portable device and configured to sense body motions of the user to generate acceleration signals ax, ay, and az in all three directions along x-axis, y-axis, and z-axis, respectively; an acceleration-exercise intensity relation table storing parameters (α
, β
) representing a generally linear correlation between the exercise intensity and a default standard deviation of the acceleration signals sensed by said sensor; andan indicator mounted to said portable device for indication of the exercise intensity, said processor including an exercise intensity calculator for determination of an instant exercise intensity (K) of the user based upon the acceleration signals sensed by said sensor, said exercise calculator comprising; data collecting means for collecting first time-series data of said acceleration signals within a predetermined first time frame (T1); calculation means for calculating a first standard deviation of the first time series data of the acceleration signals using a predetermined formula defining said default standard deviation in terms of the acceleration signals in said all three directions; reference means for referencing to said acceleration-exercise intensity relation table to obtain said parameters α
, β
that correspond to said first standard deviation; anddetermination means which uses thus obtained parameters (α
, β
) and an equation K=α
·
Sw+β
to determine said instant exercise intensity (K) where Sw is the first deviation of the acceleration signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification