One repetition maximum (1RM) estimating apparatus and method
A one repetition maximum (1RM) estimating apparatus includes a potential signal receiving unit configured to receive a potential signal of a muscle from a sensor attached to a user, and a 1RM estimating unit configured to estimate a 1RM of the user based on the potential signal.
1. An apparatus for estimating a one repetition maximum (1RM), the apparatus comprising:
a potential signal receiving unit configured to receive a potential signal of a muscle from an electromyography (EMG) sensor attached to a user; and
a 1RM estimating unit configured to estimate a 1RM of the user based on the potential signal.
2. The apparatus of claim 1 , wherein the 1RM estimating unit comprises:
an envelope determining unit configured to determine an envelope of amplitudes of the potential signal;
a frequency spectrum determining unit configured to determine a mean frequency of a frequency spectrum of the potential signal; and
a gradient determining unit configured to determine a gradient based on the envelope and the mean frequency of the frequency spectrum.
3. The apparatus of claim 2 , wherein the envelope determining unit is further configured to determine the envelope based on an absolute value of the potential signal.
4. The apparatus of claim 2 , wherein the frequency spectrum determining unit is further configured to determine the mean frequency of the frequency spectrum based on the potential signal sampled at predetermined intervals based on a maximum value of the envelope.
5. The apparatus of claim 2 , wherein the gradient determining unit is further configured to determine the gradient based on a plurality of feature points in the mean frequency of the frequency spectrum corresponding to peaks of the envelope.
6. An apparatus for estimating a one repetition maximum (1RM), the apparatus comprising:
an electromyography (EMG) sensing unit configured to sense a potential signal of a muscle of a user; and
a 1RM estimating unit configured to estimate a 1RM of the user based on the potential signal.
7. The apparatus of claim 6 , wherein the 1RM estimating unit comprises:
an envelope determining unit configured to determine an envelope of amplitudes of the potential signal;
a frequency spectrum determining unit configured to determine a mean frequency of a frequency spectrum of the potential signal; and
a gradient determining unit configured to determine a gradient based on the envelope and the mean frequency of the frequency spectrum.
8. The apparatus of claim 7 , wherein the envelope determining unit is further configured to determine the envelope based on an absolute value of the potential signal.
9. The apparatus of claim 7 , wherein the frequency spectrum determining unit is further configured to determine the mean frequency of the frequency spectrum based on the potential signal sampled at predetermined intervals based on a maximum value of the envelope.
10. The apparatus of claim 7 , wherein the gradient determining unit is further configured to determine the gradient based on a plurality of feature points in the mean frequency of the frequency spectrum corresponding to peaks of the envelope.
11. A method of estimating a one repetition maximum (1RM), the method comprising:
receiving a potential signal of a muscle from an electromyography (EMG) sensor attached to a user; and
estimating a 1RM of the user based on the potential signal.
12. The method of claim 11 , wherein the estimating comprises:
determining an envelope of amplitudes of the potential signal;
determining a mean frequency of a frequency spectrum of the potential signal; and
determining a gradient based on the envelope and the mean frequency of the frequency spectrum.
13. The method of claim 12 , wherein the determining of the envelope comprises determining the envelope based on an absolute value of the potential signal.
14. The method of claim 12 , wherein the determining of the mean frequency of the frequency spectrum comprises determining the mean frequency of the frequency spectrum based on the potential signal sampled at predetermined intervals based on a maximum value of the envelope.
15. The method of claim 12 , wherein the determining of the gradient comprises determining the gradient based on a plurality of feature points in the mean frequency of the frequency spectrum corresponding to peaks of the envelope.