Nolan Lee
Karolinska Institute and GIH, Biomechanics and Motor Control, Stockholm, Sweden.
Prosthet Orthot Int. 2009 Sep;33(3):230-41. doi: 10.1080/03093640903082118.
The aim of this study was to compare hip strength in sports-active transtibial (TT) amputees, sedentary TT amputees and sports-active non-amputees. Three 'active' (exercising recreationally at least three times per week) TT amputees, four 'inactive' or sedentary TT amputees and nine 'active' able-bodied persons (AB) underwent concentric and eccentric hip flexion and extension strength testing on both limbs on an isokinetic dynamometer at 60 and 120 degrees /s. Little strength asymmetry was noted between the limbs of the active TT amputees (8% and 14% at 60 and 120 degrees /s, respectively), their residual limb being slightly stronger. Inactive TT amputees demonstrated up to 49% strength asymmetry, their intact limb being the stronger. Active TT amputees demonstrated greater peak hip torques (Nm/kg) for all conditions and speeds compared to inactive TT amputees. Peak hip torques (Nm/kg), were greater in the active TT amputees' residual limb compared to AB. While inactive TT amputees and AB had similar flexion/extension ratios, active TT amputees exhibited a lower ratio indicating overdeveloped hip extensors with respect to their hip flexors. It is not known whether this is due to the demands of sport or exercise with a prosthetic limb, or remaining residual thigh atrophy.
本研究的目的是比较从事体育运动的经胫骨（TT）截肢者、久坐不动的TT截肢者和从事体育运动的非截肢者的髋部力量。三名“活跃”（每周至少进行三次娱乐性锻炼）的TT截肢者、四名“不活跃”或久坐不动的TT截肢者以及九名“活跃”的健全人在等速测力计上以60度/秒和120度/秒的速度对双下肢进行了向心和离心髋部屈伸力量测试。活跃的TT截肢者双下肢之间的力量不对称性较小（60度/秒和120度/秒时分别为8%和14%），其残肢力量稍强。不活跃的TT截肢者表现出高达49%的力量不对称性，其健全肢体更强。与不活跃的TT截肢者相比，活跃的TT截肢者在所有条件和速度下均表现出更大的髋部峰值扭矩（牛米/千克）。与健全人相比，活跃的TT截肢者残肢的髋部峰值扭矩（牛米/千克）更大。虽然不活跃的TT截肢者和健全人的屈伸比率相似，但活跃的TT截肢者的比率较低，表明其髋部伸肌相对于髋部屈肌过度发达。尚不清楚这是由于体育运动或使用假肢锻炼的需求，还是由于残留的大腿萎缩所致。
