Stress A - Repetitive Contraction/Small Muscles With a partner acting as timekeeper, open and close a test tube clamp as many times as you can in 30 seconds. Record this value as you rest for 10 seconds. Repeat steps 1 and 2 four more items for a total of 5 trials. Trade places with your partner and act as timekeeper as (s) he performs the same procedure. Repeat steps 1 through 4 using the other hand.

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Stress B - Repetitive Contraction/Large Muscles With a partner acting as timekeeper, raise two textbooks to shoulder height as many times as you can in 30 seconds. Record this value as you rest for 10 seconds. Repeat steps 1 and 2 four more items for a total of 5 trials. Trade places with your partner and act as timekeeper as (s)he performs the same procedure. Repeat steps 1 through 4 using the other arm.

Stress C - Sustained Contraction/Small Muscles

1. With a partner acting as timekeeper, squeeze a test tube clamp into a fully open position and hold it for as long as you can.
2. Record this value as you rest for 10 seconds.
3. Repeat steps 1 and 2 four more items for a total of 5 trials.
4. Trade places with your partner and act as timekeeper as (s)he performs the same procedure.
5. Repeat steps 1 through 4 using the other hand.

Stress D - Sustained Contraction/Large Muscles

1. With a partner acting as timekeeper, raise two textbooks to shoulder height and hold it there as long as you can while your partner times you.
2. Record this value as you rest for 10 seconds.
3. Repeat steps 1 and 2 four more items for a total of 5 trials.
4. Trade places with your partner and act as timekeeper as (s)he performs the same procedure.
5. Repeat steps 1 through 4 using the other arm.