KNES 289 Lecture Notes - Lecture 1: Horizontal And Vertical, Skeleton, Achilles Tendon
1 Sep 2018
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Document Summary
Subsystems that produce human movement: nervous and sensory system--muscles---skeletons. For running and walking there are two phases. Phase that foot is in contact with ground so the stance phase. Muscles are used to support body weight. Vertical direction has to average out to your body weight. Phase that you use muscles to swing legs forward. You extend your knees and arrest the motion of the knee. Difference between running and walking you spend both feet on the ground more when walking. In running the stance phase is less than half the duration of one stride. Muscle generates force in a active way. Tendon--rubber band--it can be stretched and generate force and has to retract. Muscle and tendon: muscle and tendon unit. Any time you move those muscle tendons have to change length. One implication is that if you have fast movement you will have fast changes in length. The muscle tendon unit does it produces force.
