BPK 142 Lecture Notes - Lecture 5: Plyometrics, Bench Press, Dynamometer
6 Jul 2017
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Document Summary
Muscular strength - the greatest amount of force that muscles can produce in a single maximal effort. Power = work per unit time = force x velocity. Power involves strength and speed: types of muscular contraction, dynamic (isotonic) contraction - the bony levers move through a range of motion when the appropriate muscles perform work. Concentric contraction - the muscle shortens with varying tension as it lifts a constant load. Eccentric contraction - the external resistance exceeds the muscle force and the muscle lengthens while developing force. Eccentric contractions are usually used in resisting gravity. Dynamic constant external resistance (dcer: isometric contraction - static contraction. Any exercise that can be performed concentrically can also be performed eccentrically. For example, in the bench press exercise pushing the bar from the chest to the finish or arms extended position involves a concentric contraction of the pectorals major, anterior deltoid, and triceps muscles.
