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您的检索式：作者名="Brian H.Dalton"
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| 1 | 老年人的神经肌肉结构和功能(英文)显示文摘成年人身体的自然衰老伴随诸多人类神经肌肉系统的功能性损伤,较为常见的一种是收缩肌肉群的损耗,称为少肌症。肌肉群损耗主要是因为可运动单元的消失伴剩余肌肉纤维萎缩,但不只是肌肉群的损耗导致老年人肌肉功能受损,肌纤维类型和肌球蛋白重链亚型表达改变也会造成肌肉衰弱、迟缓、收缩功能降低。本研究重点关注与人体自然衰老、年龄相关性疲劳、不同年龄段肌肉收缩活动力量差异等相关的运动单位消耗。 | Geoffrey A.Power Brian H.Dalton Charles L.Rice | 2013 | Journal of Sport and Health Science2013，2，4： | 2 |
| 2 | Eccentric exercise-induced muscle weakness abolishes sex differences in fatigability during sustained submaximal isometric contractions显示文摘Background:Females are typically less fatigable than males during sustained isometric contractions at lower isometric contraction intensities.This sex difference in fatigability becomes more variable during higher intensity isometric and dynamic contractions.While less fatiguing than isometric or concentric contractions,eccentric contractions induce greater and longer lasting impairments in force production.However,it is not clear how muscle weakness influences fatigability in males and females during sustained isometric contractions.Methods:We investigated the effects of eccentric exercise-induced muscle weakness on time to task failure(TTF)during a sustained submaximal isometric contraction in young(18-30 years)healthy males(n=9)and females(n=10).Participants performed a sustained isometric contraction of the dorsiflexors at 35°plantar flexion by matching a 30%maximal voluntary contraction(MVC)torque target until task failure(i.e.,falling below 5%of their target torque for>2 s).The same sustained isometric contraction was repeated 30 min after 150 maximal eccentric contractions.Agonist and antagonist activation were assessed using surface electromyography over the tibialis anterior and soleus muscles,respectively.Results:Males were~41%stronger than females.Following eccentric exercise both males and females experienced an~20%decline in maximal voliuntary contraction torque.TTF was-34%longer in females than males prior to eccentic exercise-induced muscle weakness.However,following eccentric exercise-induced muscle weakness,this sex-related difference was abolished,with both groups having an'45%shorter TTF.Notably,there was~100%greater antagonist activation in the female group during the sustained isometric contraction following exercise-induced weakness as compared to the males.Conclusion:This increase in antagonist activation disadvantaged females by decreasing their TTF,resulting in a blunting of their typical fatigability advantage over males. | Hanna L.Jodoin Avery Hinks Olivia P.Roussel Vincenzo S.Contento Brian H.Dalton Geoffrey A.Power | 2023 | Journal of Sport and Health Science2023，12，4： | 0 |
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