Device for measuring muscle signals

A computer program product embodied on a non-transitory computer readable medium, comprising computer program code configured to, when executed on at least one processor, cause an apparatus or a system to:

• measure a signal from a muscle to obtain a muscle activation signal during at least one contraction of said muscle;
• convert said muscle activation signal from the time domain to the frequency domain to obtain a muscle activation spectrum;
• determine a first band and a second band from the muscle activation spectrum measured during a maximum voluntary contraction of the muscle;
• determine first reference power values for said first band and said second band from the muscle activation spectrum that is measured during the maximum voluntary contraction;
• use said first reference power values in determining a ratio of signal characteristics from said first band and said second band of said muscle activation spectrum;
• determine a muscle state indicator from said muscle activation spectrum by using said ratio of signal characteristics from the first band and the second band of said muscle activation spectrum;
• and
• guide the exercise using the determined muscle state indicator.

A method for determining a state of a muscle of a user and guiding the user in an exercise based on the determined state, the method comprising using a device that includes at least one processor, a memory including computer program code, and at least one sensor configured to detect a signal from the muscle, wherein execution of the computer program code by the processor is configured to cause the device to:

• measure the signal from the muscle detected by the sensor using the processor to obtain a muscle activation signal during at least one contraction of said muscle;
• convert said muscle activation signal from the time domain to the frequency domain to obtain a muscle activation spectrum;
• determine a first band and a second band from the muscle activation spectrum measured during a maximum voluntary contraction of the muscle;
• determine first reference power values for a first band and a second band from the muscle activation spectrum that is measured during a maximum voluntary contraction of the muscle;
• use said first reference power values in determining a ratio of signal characteristics from said first band and said second band of said muscle activation spectrum;
• determine a muscle state indicator from said muscle activation spectrum by using said ratio of signal characteristics from the first band and the second band of said muscle activation spectrum;
• and
• guide the exercise based on the determined muscle state indicator.