Wednesday, 20 May 2015

Fatigue and exercise intensity using hand clenching


Does the intensity of muscle contractions affect the length of time it takes to become fatigued?

EQUIPMENT

Stopwatch
Metronome

METHOD

1. Sit with your stronger arm resting on the table, palm uppermost.
2. Clench and unclench your fist, at a rate of once every 3 seconds in time with the metronome. Record how long it takes to feel so fatigued that it becomes too painful to continue.
3. Rest for 2 minutes, then repeat twice more at the same intensity.
4. Repeat the clenching and unclenching at a rate of once every 2 seconds, then every 1 second, then 2 per second, then 3 per second.
5. You should have 3 repeats at each of 5 different intensities.

Risks assessment

1. Ensure that the proper rest time between repeats is observed, to prevent strain on the arm muscles and tendons.
2. If the rest time is insufficient to fully recover, then extend it to 3 minutes.