Force, velocity and power relationship of ankle plantar flexors and ankle dorsiflexors in the elderly

老年人踝关节跖屈肌和踝背屈肌的力、速度和功率关系

• 批准号: 17500438
• 负责人: TOJI Hideki
• 金额: $ 0.9万
• 依托单位: University of Hyogo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17500438/
• 关键词: aging; maximal isometric strength; maximal velocity; muscle power; cross-sectional area; EMG; 筋パワー; 筋力; 収縮速度; 足関節

The present study aimed to investigate the characteristics of force, velocity and power relations of ankle plantar flexors and ankle dorsiflexors in elderly. The subjects were 15 elderly men (G-aged) and 15 college male students (G-young) Using specially designed apparatus, the force, velocity and resultant power output by the plantar-and dorsi-flexors muscles were measured, and the force-velocity relations were calculated according to Hill's equation: (F+a)(V+b)=(Fmax+a)b. Ante and post cross-sectional area (CSA-ante, CSA-poste) of the lower limb was estimated from the square of the muscle thickness measured by an ultrasonic apparatus. In CSA-poste, no significant difference was observed between the two age groups, however, the CSA-ante was significantly lower in G-aged than in G-young. The maximal power values were significant differences (G-aged < G-young) in Pmax as well as in Fmax and Vmax. Compared with G-young, G-aged showed a greater reduction in Pmax (69.1%) than Fmax (69.5%) … More and Vmax (82.8%) of the plantar-flexors, and also showed a greater reduction in Pmax (69.4%) than Fmax (81.8%) and Vmax (78.9%) of the dorsi-flexors. The ratios of Fmax/CSA-poste, Pmax/CSA-poste and Vmax/lower limb length of the plantar-flexors were significantly lower in G-aged than in G-young. However the ratios of Famx/CSA-poste and Pmax/Csa-poste Vmax/lower limb length of the dorsi-flexors were no significant in G-aged than in G-young. The force-velocity curves of G-aged tended to be lower than that of the G-young. There were significant differences among G-aged and G-young for Vmax, V_<10>, V_<20>, V_<30>, V_<45> and V_<60> in the dorsi-flexors, however, not for under various %Fmax load in the plantar-flexors. The iEMG and %iEMG of agonist and antagonist for the plantar-and dorsi-flexors were no significant between G-aged and G-young.From these results, it was suggested that the ability to develop muscular power may be reduced more functionally than neural factor with increasing age. Less

本研究旨在探讨老年人踝跖屈肌和踝背屈肌的力、速度和功率关系的特点。用特制的装置测量了15名老年男性（G-岁）和15名男大学生（G-青年）的跖屈肌和背屈肌输出的力、速度和合成功率，并根据Hill公式计算了力-速度关系：（F+a）（V+B）=（Fmax+a）B。下肢的前后横截面积（CSA-ante，CSA-poste）由超声仪测量的肌肉厚度的平方估计。两年龄组之间CSA后测值无显著性差异，但G-年龄组CSA前测值显著低于G-青年组。最大功率值在Pmax、Fmax和Vmax上存在显著性差异（G-aged < G-young）。与G-年轻相比，G-老年显示出Pmax（69.1%）比Fmax（69.5%）更大的降低 ...更多信息 跖屈肌的Pmax（69.4%）较背屈肌的Fmax（81.8%）和Vmax（78.9%）降低更明显。跖屈肌群的Fmax/CSA-poste、Pmax/CSA-poste和Vmax/下肢长的比值G-老年组显著低于G-青年组。而背屈肌群Famx/CSA-poste和Pmax/Csa-poste Vmax/下肢长的比值，老年组与青年组相比无显著性差异。力-速度曲线的G-老化倾向于低于G-年轻。背屈肌Vmax、V_1、V_2、V_3、<10>V_4<20>、<30>V_5<45>、V_6<60>在不同%Fmax负荷下，老年组与青年组间差异显著，而跖屈肌Vmax、V_4、V_6、V_6在不同%Fmax负荷下差异不显著。足背屈肌的iEMG和激动肌和拮抗肌的%iEMG在G-年龄组和G-青年组之间均无显著性差异，提示随着年龄的增长，肌肉力量发展能力的功能性降低可能比神经因素更为明显。少

项目成果

Force, velocity and power relationship of ankle plantar flexors in the elderly

老年人踝跖屈肌力、速度与功率的关系

• 发表时间: 2006
• 期刊: 57^<th> Conference of Japan Society of Physical Education, Health and Sport Sciences
• 作者: Ryoso Tomosue;Tadashi Muramatsu;友末 亮三・村松 憲;Hideki Toji;Hideki Toji
• 通讯作者: Hideki Toji

Force, velocity and power relationship of ankle dorsiflexors in the elderly

老年人踝背屈肌力、速度与功率的关系

• 发表时间: 2007
• 期刊: 58^<th> Conference of Japan Society of Physical Education, Health and Sport Sciences
• 作者: Ryoso Tomosue;Tadashi Muramatsu;友末 亮三・村松 憲;Hideki Toji
• 通讯作者: Hideki Toji