Contractile and Biochemical Properties of Muscle Fibers
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12 Terms
Force
Specific force (specific tension): how much force is generated relative to muscle cross-sectional area HOW HARD A MUSCLE CAN PULL
Speed of Contraction
Shortening velocity (Vmax): how quickly a muscle can contract
Power
Force x shortening velocity
Efficiency
Force relative to amount of ATP used
Fatigue Resistance
How well contractions can be sustained over time
Oxidative Capacity
How well muscle uses oxygen to produce ATP during exercise. More mitochondria, capillaries, and myoglobin increase oxidative capacity.
Myosin isoforms
Different isoforms have different ATPase activity. Myosin isoforms with higher ATPase activity produce ATP quicker.
Sarcoplasmic Reticulum
More developed = better Calcium release
Contractile proteins
Higher amounts of proteins increases force (strength) of muscle
Greater Oxidative Capacity
Better fatigue resistance and fiber efficiency
Myosin isoforms with more ATPase activity
Faster shortening velocity and greater power
More developed sarcoplasmic reticulum
Faster calcium release → faster shortening velocity and greater power
Note 
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