KNES 360 Lecture Notes - Lecture 10: Phosphofructokinase, Cellular Respiration, Motor Unit
10 Dec 2018
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Higher oxidative capacity: endurance athlete: high capacity. Adapted to produce atp via oxidative metabolism. High % slow twitch in leg muscles. Motor unit strength: lower: smaller fibers, smaller units, think of a skinny endurance athlete not being able to lift as much. Sprinter: low oxidative capacity due to nature of training ** exercise specificity. 2a and 2b are more similar than difference. Lots of 2a: will have a moderate amount of type 1 and type 2b. Less fatigue resistant: think of a lifter, more fibers, larger motor unit= greater force. Minimum time it takes to reach maximum force. Can be increased in skeletal muscle: more in type 2. Sprinting stimulating muscle to increase myosin atpase. Mass/capacity to release calcium/ reuptake= higher in type 2a. Muscles used a lot: vastus lateralis, quadriceps, gastrocnemius. Sedentary: 50% type 1 and 50% type 2 (%25 for each kind of type2, not true in every single muscle, but many of them.
