探討肌肉截面積對肌力大小的影響

The Effect of Cross Sectional Area upon Muscular Power

10.29889/KUASPE.200911.0029

高紹源(Shau-Yuan Gau)；鍾潤華(Ruen-Hua Jung)；鄭憲成(Hsien-Cheng Cheng)

爆發力 ； 肌肉截面積 ； 立定跳高 ； power ； cross section area ； vertical jump

高應科大體育

8期（2009 / 11 / 01）

337 - 347

繁體中文

不同的肌纖維，很明顯的展現出收縮速度的不同。然而力量的產生是與肌纖維的截面積有相關，紅肌纖維的截面積比白肌纖維的截面小。而爆發力是等於力量乘以速度，所以增加力量或速度都以可增加爆發力，或者是兩者都增加，也可以增加power。另外肌纖維在空間排列方式的不同，也會影響到肌肉的收縮速度，相對也會影響到爆發力的產生。例如當肌纖維以串聯的方式排列，則其在單位時間內所產生的總位移，較肌纖維以並聯的方式，所產生的位移來的大，所以相對的其收縮速度較快，但其產生的力量就相對比並聯方式來的小。因此，纖維的空間組合的不同，也會影響到力量及爆發力的不同。

The different fiber types show clear differences in contraction speed, the force developed in a maximal static action is independent of the fiber type, but related to the cross-sectional area. Since type I (slow) fibers tend to have smaller area than type II (fast) fibers, a high percentage of type I fibers is believed to be associated with a smaller muscle area. The two most reliable and reproducible indices of the functional capacities of skeletal muscle are its maximum force potential and its maximum rate of shortening determined under maximal stimulation conditions. The architectural design of the skeletal muscle has a significant impact on these functional properties. For example, imagine two muscles having similar masses and biochemical profiles. Under maximal stimulation conditions and under identical biomechanical constraints, the relative proportion of half sarcomeres arranged either in series or in parallel will dictate the relative priority of force and displacement in each muscle.