Sex difference in force generation capacity during repeated maximal knee extensions

被引:39
作者
Kanehisa, H
Okuyama, H
Ikegawa, S
Fukunaga, T
机构
[1] INT BUDO UNIV,DEPT PHYS EDUC,KATUSURA,CHIBA 19401,JAPAN
[2] JAPAN WOMENS UNIV,SPORTS SCI LAB,BUNKYO KU,TOKYO 112,JAPAN
[3] UNIV TOKYO,DEPT SPORTS SCI,MEGURO KU,TOKYO 153,JAPAN
来源
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY | 1996年 / 73卷 / 06期
关键词
isokinetic contraction; muscle endurance; muscle cross-sectional area; B-mode ultrasound;
D O I
10.1007/BF00357679
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The force generation capacity, during 50 repeated maximal knee extensions with a constant velocity of 3.14 rad . s(-1), and cross-sectional area (CSA) of the quadriceps femoris muscles were determined for untrained women (n = 36) and men (n = 27) aged from 18 to 25 years. As force scores in the maximal repetitions, the mean values of force ((F) over bar)$ of every 5 consecutive and all trials and the percentage of decline of (F) over bar (%D) with 50 contractions were calculated. The CSA was measured by using a B-mode ultrasound technique at the midpoint of the thigh length. The (F) over bar decreased from 303 (SEM 13) N at the 1st-5th trial to 155 (SEM 9) N at the 46th-50th trial for the men, and from 202 (SEM 9)N to 94 (SEM 4)N for the women. The F of every 5 consecutive and all trials were significantly correlated to muscle CSA: for the men r = 0.552-0.872 (P < 0.01) and for the women r = 0.609-0.857 (P ( 0.01). The men showed significantly higher F at every 5 consecutive trials than the women even when calculated per unit muscle CSA <((F)over bar . CSA(-1)>. There were significant correlations between %D and <(F)over bar CSA(-1)> at the 1st-5th trial: r = 0.538 (P < 0.01) for the men and r = 0.631 (P < 0.01) for the women, respectively. The average values of %D were almost the same in both sexes: for the men 48 (SEM 3) % and for the women 52 (SEM 2) %, respectively. However, an ANCOVA calculation on %D, using <(F)over bar . CSA(-1)> at the 1st-5th trial as the covariate, indicated that the women had significantly higher %D than the men. Thus, the force output during the maximal repetitions was significantly correlated to the CSA of quadriceps femoris in both sexes. The force output was lower in the women than in the men even when the difference in the muscle CSA was allowed for. The women had higher %D than the men when force output per unit muscle CSA during the initial 5 repetitions was compared.
引用
收藏
页码:557 / 562
页数:6
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