论文部分内容阅读
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。
Objective: To investigate the characteristics of the rectus femoris muscle under traditional gravitational resistance (GR) and hydraulic resistance (HR) conditions by means of surface electromyography (sEMG) The special suitability. Methods: Under the similar range of motion, speed and starting resistance, 11 athletes completed knee stretching exercises on the gravitational and hydraulic knee extension trainers for 10 times. The surface electromyography signals obtained were rectified, filtered and amplitude Standardization and time standardization were performed to compare the difference between peak timing (PT) and duration (D). Results: The PTGR of gravity device was 32.7 ± 6.5, which was significantly faster than that of PTHR under hydraulic device (PTHR = 45.6 ± 8.2, P = 0.001). The former duration of DGR was 57.3 ± 6.5, which was significantly shorter than the latter. Conclusion: The resistance of hydraulic training device has the characteristics of late peak time and long duration. It has unique advantages in improving the specialization of strength training in swimming, skinning and rowing. It is suggested that such projects should use such resistance devices to develop their own special forces.