Weebly
Name:_______________________________________ Date:___________ Pd:______An Adventure with Muscle FatigueIntroduction:Your muscles need glycogen (muscle sugar) in order to function. When the glycogen is broken down into energy for the muscles a waste product called lactic acid is produced. A buildup of lactic acid decreases the muscle’s ability to contract and muscle fatigue sets in.Purpose:The purpose of this lab is to explore the muscle fatigue that sets in when you use your muscles. Today we will be doing an observation activity.Materials:YourselfTwo textbooks (Holt, both blue or both green)TimersActivity One: WeightliftingProcedures:Have one person hold a book in each hand.Raise one arm straight out parallel to the ground and the other arm down at your side.As soon as you assume the position, have your partner start the timer.Hold the position for as long as you can until your muscles start to really hurt. When you say stop, your partner should stop the timer.Record the time on your paper.Have the other person (partner) repeat steps 1-5.Begin the next activity.Partner One’s time holding the books: _____________ minutes ____________ secondsPartner Two’s time holding the books: _____________ minutes ____________ secondsActivity Two: Too Tired to SitProcedures: Have one partner sit against the wall with your knees bent at a 90 degree angle. Your partner should start the timer.Hold this position for as long as it takes to feel your muscles getting tired. (HINT: If it takes more than 3 minutes, you are NOT doing the activity correctly!)When you feel tired, say stop and your partner should stop the timer.Have the other person (partner) repeat steps 1-3.Answer the questions on your lab paper.Partner One’s time against the wall: _____________ minutes _____________ secondsPartner Two’s time against the wall: _____________ minutes _____________ secondsQuestions:Answer the following questions about the activity. Please answer in complete sentences!1. How long did you hold the book before fatigue got the better of you?2. Which arm felt fatigue the most? (straight out or by your side)3. What did you notice about the arm that was held straight out? (Ex: tiredness, shaking, difficulty holding it up?)4. How long did you sit before your legs started to burn like crazy?5. What did you notice about your legs as you were sitting against the wall? (Ex: tiredness, burning feeling, shaking, difficulty staying up?)6. How did it feel to try to walk right after sitting against the wall?7. The funny feeling in your legs is called muscle fatigue. Fatigue is caused by the buildup of which substance in the muscle? (Hint: Look back at the Introduction of this activity.) ................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.