Sex differences in static strength and fatigability in three different muscle groups

Maximal voluntary static muscle force production was assessed both in strength trials and during 2-min contractions by three muscle groups (right-hand finger flexors [RHF], right-leg extensors [RLE], and both leg extensors [BLE]) in young males (n = 13) and females (n = 14). There was a significant difference (p less than .01) between males and females for RHF strength and BLE strength but no significant difference between sexes for RLE strength. During the 2-min task, impulse (force x time) declined significantly (p less than .001) and there was a significant difference (p less than .001) between muscle groups, but there was no difference between sexes. There was a significant (p less than .05) sex x time interaction for the impulse values indicating that the fatigability was greater in males than females.     

身体成分研究的10大问题

摘要：理解身体成分对于理解人体健康、疾病和功能至关重要。身体成分的研究集中在评估方法的改进、对随着生长发育和老龄化身体成分正常变化的描述、以及由于疾病和计划性干预带来的身体成分的变化。每个关注点都很重要,从某种意义上来说,它们是相互依赖的。因为技术的进步使得更多复杂的问题被解决,反过来也推动研究方法的更好发展。尽管基础性的问题仍然存在,但每个领域里都有了明显进步。例如：生长发育的轨迹往往用横断面数据进行评估,考虑到也需要长期观察性资料,因此,也需要纵向描述性数据。随着实验室方法的改进,场地测试方法的发展对于筛选受试者和临床实践仍然具有重要意义。尽管已经认识到了干预应答存在广泛个体差异,但结果的均值仍然受到重视。随着技术的进步,可以研究引起身体成分变化的遗传和非遗传因素,但这些技术需要先应用于长期、控制严格的试验。在本文中,我们提出了该领域需要进行研究的10大问题,以推动该领域的发展。