Maughan R J, Watson J S, Weir J
Br J Sports Med. 1984 Sep;18(3):149-57. doi: 10.1136/bjsm.18.3.149.
This study has examined muscle strength and cross-sectional area in a group of 35 healthy untrained male subjects and 8 subjects who had been engaged in a strenuous weight-training programme. The maximum voluntary knee extension force which could be produced by the untrained subjects was 742 +/- 100 N (mean +/- SD). The trained subjects could produce a significantly (p less than 0.001) greater force (992 +/- 162 N). Cross-sectional area of the knee-extensor muscle group was 81.6 +/- 11.8 cm2 in the untrained subjects and 104.1 +/- 12.3 cm2 in the trained subjects (p less than 0.001). In the untrained subjects, a significant correlation existed between strength and muscle cross-sectional area (r = 0.56, p less than 0.001). In the same group of subjects, there was a significant inverse relationship between muscle cross-sectional area and the ratio of strength to cross-sectional area (r = 0.55, p less than 0.001). The mean ratio of strength to cross-sectional area was 9.20 +/- 1.29 for the untrained group whereas for the trained group this ratio was 9.53 +/- 1.01. It is suggested that the inverse relationship between strength per unit cross-sectional area and cross-sectional area results in part from an increased angle of pennation in the larger muscles.
本研究检测了35名未经训练的健康男性受试者以及8名参与高强度负重训练计划的受试者的肌肉力量和横截面积。未经训练的受试者所能产生的最大自主膝关节伸展力为742±100牛（均值±标准差）。经过训练的受试者能够产生显著更大的力量（992±162牛，p<0.001）。未经训练的受试者膝关节伸肌肌群的横截面积为81.6±11.8平方厘米，经过训练的受试者为104.1±12.3平方厘米（p<0.001）。在未经训练的受试者中，力量与肌肉横截面积之间存在显著相关性（r=0.56，p<0.001）。在同一组受试者中，肌肉横截面积与力量和横截面积之比之间存在显著的负相关关系（r=0.55，p<0.001）。未经训练组的力量与横截面积的平均比值为9.20±1.29，而训练组的这一比值为9.53±1.01。研究表明，单位横截面积力量与横截面积之间的负相关关系部分源于较大肌肉中羽状角的增加。
