Murray M P, Duthie E H, Gambert S R, Sepic S B, Mollinger L A
J Gerontol. 1985 May;40(3):275-80. doi: 10.1093/geronj/40.3.275.
This study provides normal baselines of knee muscle strength for women up to 86 years of age. Knee muscle strength (torque) was measured during maximum isometric and dynamic (isokinetic) contractions in 72 normal healthy women in three age groups between 20 and 86 years. Strength of the oldest group ranged from 56 to 78% of that in the youngest group, depending on knee joint position. Strength values were greater for isometric contractions than for isokinetic contractions (performed at 36 degrees per second) and were approximately twice as great for the extensor as for the flexor muscles. For both muscle groups, the torque generated with the knee in 30 degrees of flexion was usually lower than that generated with the knee at the 45- or 60-degree position. Despite the significant deficit found in the strength of the oldest group, it is likely that this relative weakness would not be detected on routine clinical examination using manual muscle testing.
本研究提供了86岁及以下女性膝关节肌肉力量的正常基线数据。对72名年龄在20至86岁之间的正常健康女性，分三个年龄组，在最大等长收缩和动态（等速）收缩过程中测量了膝关节肌肉力量（扭矩）。最年长组的力量范围为最年轻组的56%至78%，具体取决于膝关节位置。等长收缩时的力量值大于等速收缩（每秒36度）时的力量值，伸肌力量值约为屈肌的两倍。对于这两组肌肉，膝关节在30度屈曲时产生的扭矩通常低于在45度或60度位置时产生的扭矩。尽管最年长组的力量存在显著不足，但在常规临床检查中使用徒手肌力测试可能无法检测到这种相对较弱的情况。
