论文部分内容阅读
摘 要：目的：通过表面肌电图技术(surface electromyography, sEMG)探讨伸膝运动时传统重力阻力(gravitational resistance, GR)和液压阻力(hydraulic resistance, HR)条件下股直肌的收缩特点，比较两种阻力的专项适宜性。方法：在相似的运动范围、速度以及起动阻力条件下，11名运动员分别在重力式和液压式伸膝训练器上完成10次伸膝练习，对获得的表面肌电信号进行整流、滤波、振幅标准化、时间标准化处理，比较峰值时刻（peak timing, PT）与持续时间(duration, D)的差异。结果：重力装置条件下的PTGR=32.7±6.5，明显快于液压装置下的PTHR=45.6±8.2，p=0.001；前者持续时间DGR=57.3±6.5，明显短于后者DHR=73.6±6.7。结论：液压训练装置的阻力具有峰值时间晚，持续时间长的特点，在提高游泳、皮划、赛艇等项目的力量训练的专项化程度方面具有独到的优势。建议这类项目多采用此类阻力装置发展专项力量能力。
关键词：表面肌电图，专项力量，重力阻力，液压阻力
A Study on the Resistance Specificity of sEMG Parameters
under Non-fatigue Contractions
YANG Hong-chun1, WANG Jian2, TAO Rong3
(1. Zhejiang Research Institute of Sports Science, Hangzhou 310004, Zhejiang China; 2. Institute of Sports Science and Technology, Zhejiang University, Hangzhou 310028, Zhejiang China; 3. Zhejiang College of Sports, Hangzhou 311231, Zhejiang China)
Abstract：Objective：The purpose of this study was to compare the specificity of gravitational resistance (GR) and hydraulic resistance (HR) by analyzing surface electromyography (sEMG) of rectus femoris during knee extension. Method: Eleven athletes performed 10 repetitions of knee extension under GR and HR conditions respectively. SEMG signals of rectus femoris were rectified, filtered, amplitude normalized, time normalized to compare the peak timing (PT) and duration (D). Results: PT (PTGR=32.7±6.5) and D (DGR=57.3±6.5) of sEMG under GR condition were significantly faster or shorter than those (PTHR=45.6±8.2 , DHR=73.6±6.7) under HR condition. Conclusion: Hydraulic resistance was characteristic of slower peak timing and longer duration. It might offer the unique advantage for enhancing specific strength in swimmers, rowers. Athletes of such sports should develop their specific strength by utilizing hydraulic devices more frequently.
Key words: surface electromyography, specific strength, gravitational resistance, hydraulic resistance
关键词：表面肌电图，专项力量，重力阻力，液压阻力
A Study on the Resistance Specificity of sEMG Parameters
under Non-fatigue Contractions
YANG Hong-chun1, WANG Jian2, TAO Rong3
(1. Zhejiang Research Institute of Sports Science, Hangzhou 310004, Zhejiang China; 2. Institute of Sports Science and Technology, Zhejiang University, Hangzhou 310028, Zhejiang China; 3. Zhejiang College of Sports, Hangzhou 311231, Zhejiang China)
Abstract：Objective：The purpose of this study was to compare the specificity of gravitational resistance (GR) and hydraulic resistance (HR) by analyzing surface electromyography (sEMG) of rectus femoris during knee extension. Method: Eleven athletes performed 10 repetitions of knee extension under GR and HR conditions respectively. SEMG signals of rectus femoris were rectified, filtered, amplitude normalized, time normalized to compare the peak timing (PT) and duration (D). Results: PT (PTGR=32.7±6.5) and D (DGR=57.3±6.5) of sEMG under GR condition were significantly faster or shorter than those (PTHR=45.6±8.2 , DHR=73.6±6.7) under HR condition. Conclusion: Hydraulic resistance was characteristic of slower peak timing and longer duration. It might offer the unique advantage for enhancing specific strength in swimmers, rowers. Athletes of such sports should develop their specific strength by utilizing hydraulic devices more frequently.
Key words: surface electromyography, specific strength, gravitational resistance, hydraulic resistance