- 期刊
髖關節角度改變對等長及等速運動中膝屈伸肌之影響
Effects of Hip and Knee Angle to Kenn Flexion and Extension Torque in Isometric and Isokinetic Exercises
摘要
本研究乃利用Cybex 340等速肌力測量儀，對20位年輕男性進行測試，以探討髖膝關節角度改變在等長及等速運動中對膝屈伸肌力之影響。當受測者在坐位 (髖85°)、半躺(髖135°)、平躺(髖180°)姿勢下分別測具慣用腿的等長及等速收縮 (60°/秒及180°/秒)肌力。 等長屈曲運動以膝關節在0°所得之肌力最大，膝屈曲增加則肌力依次遞減。髖關節以坐位所得之肌力最大，平躺最小。等長伸展運動則顯示髖關節變化對肌力影響不大，而膝間節以在60°所得之肌力最大，依次為90°、30°、0°。 等速運動中髖關節對伸肌力產生之影響與等長運動結果相同，但此影響似乎隨著速度的增加而逐漸減少。 在探討等速運動中髖膝角度改興對最大力距(peak torque)、平均力(average power)、總作功(total work)的影響時發現：(1)無論是否考慮體重因素，所得之統計意義是相同的。(2)低速時，此三項之H/Q值以在半躺位置所得最大。(3)高速時，髖關節變化對此三值之H/Q值影響不大(4)無論在低速或高速所得之H/Q值均介於0.5至0.7之間。(5)平均力等於總作功除以時，高速運動所需時間較低速為少，故高速運動所得之平均力較大。
並列摘要
In order to study the effects of hip and knee angle to knee flexion and extension torque and other measurements obtained from Cybex 340 isokinetic dynamometer in isometric and isokinetic exercises, twenty normal young adults were tested at various hip position(SITTING:hip 85°,SEMIRECLINED:hip 135°, SUPINE: hip 180°) and different speeds (ISOMETRIC:0° /sec, LOW SPEED ISOKINETIC:60°/sec, HIGH SPEED ISOKINETIC:180°/sec). Adequate warm-up exercise and rest was requested between each test in this study. In isometric flexion exercises, the greatest torque value was obtained at supine position. The torque value was decreasing as knee flexion angle increasing. In isometric extension exercises, there was no significant change of touque generation in different hip position. The greatest torque value was obtained at knee flexion 60°, dereasing in order as 90°,30°,0° The effects of hip position on torque generating were rather similar in isometric and isokinetic tests, either in flexion or extension, but the effect became not so significant as the speed garadually increasing. In study of the effect of hip and knee position on peak torque(PT),average power(AVP),total work(TW) in isokinetic tests, the results were as following: (1) No matter the data was corrected by individual body weight or not, the stastistic significance was the same.(2) In low speed, the greatest H/Q ratio of PT,AVP,and TW were obtained at semireclined position.(3) In high speed hip position showed no significant effect on the H/Q ratio of PT,AVP, and TW.(4) All H/G ratios at various positions and different speeds were within 0.5-0.7. (5) AVP (TW/time) was found higher in high speed because the time span was shorter in high speed ecercise.