L21: 21.1

“Exploring Muscle Fatigue”

QUESTION:

What effect does repeated exercise have on skeletal muscles?

HYPOTHESIS?

I believe….because….

PROCEDURE:

See page 176 You will be squeezing for a

total of 2 ½ minutes, recording your number of squeezes after each 30 seconds.

DATA:NAME: TRIAL 1:

(30 sec)

TRIAL 2:

(30 sec)

TRIAL 3:

(30 sec)

TRIAL 4:

(30 sec)

TRIAL 5:

(30 sec)

Average:

DATA:

Using your group’s average, construct a line graph.

Label the axes: X axis = time Y axis = # of squeezes

DATA:

1. What happened to the number of squeezes made per 30-second trial?

2. How did your muscles feel at the end of the exercise?

3. On the basis of what you have learned about how your body releases and uses energy, explain why you think muscles tire.

VOCABULARY:

Energy Muscle fatigue

CONCLUSION:

Be sure to look back at your original question.

Write in complete sentences. Use your vocabulary words in

your conclusion.