Milner-Brown H S, Mellenthin M, Miller R G
Arch Phys Med Rehabil. 1986 Aug;67(8):530-5.
Physiologic methods have been developed to objectively quantify muscle strength, endurance, and fatigability. Isometric force and rectified/integrated electromyogram were simultaneously recorded during the three phases of a recording session: pre-fatigue, fatigue (1 min duration) and post-fatigue recovery (up to 10 min). Five parameters of muscle performance were computed: Maximum force (MF) exerted during isometric voluntary contraction (muscle strength); Force-time integral--area under force-time plot (endurance); Fatigue index (FI) (% reduction in MF); Neuromuscular efficiency (force/mV of EMG recruited), and Recovery time (RT). Normal values based on data from 20 normal subjects were determined for four muscles: index finger abductor, elbow flexors, knee extensors, and ankle dorsiflexors. Neuromuscular efficiency (NME) decreased significantly (20 to 70%) at the end of the fatigue phase; it generally increased to the pre-fatigue level in 2 to 10 min, during the recovery phase. The period needed to reach pre-fatigue level was referred to as RT. The elbow flexors had the highest mean FI (48%) and the longest RT (greater than 6 min); the ankle dorsiflexors had the lowest mean FI (34%) and the shortest RT (1.5 min). These methods have been used also to evaluate the effects of weight training in two patients with neuromuscular disorders.
已经开发出了生理学方法来客观地量化肌肉力量、耐力和易疲劳性。在记录过程的三个阶段同时记录等长肌力和整流/积分肌电图：疲劳前、疲劳期（持续1分钟）和疲劳后恢复（长达10分钟）。计算了五个肌肉性能参数：等长自主收缩期间施加的最大力（MF）（肌肉力量）；力-时间积分——力-时间图下的面积（耐力）；疲劳指数（FI）（MF降低的百分比）；神经肌肉效率（募集的肌电图每毫伏的力），以及恢复时间（RT）。根据20名正常受试者的数据确定了四块肌肉的正常值：食指外展肌、肘屈肌、膝伸肌和踝背屈肌。在疲劳期结束时，神经肌肉效率（NME）显著下降（20%至70%）；在恢复阶段，它通常在2至10分钟内增加到疲劳前水平。达到疲劳前水平所需的时间称为RT。肘屈肌的平均FI最高（48%），RT最长（超过6分钟）；踝背屈肌的平均FI最低（34%），RT最短（1.5分钟）。这些方法也已用于评估两名神经肌肉疾病患者进行重量训练的效果。
