Gerdle B, Hedberg B, Angquist K A, Fugl-Meyer A R
Scand J Rehabil Med. 1986;18(1):9-15.
Isokinetic plantar flexor peak torques (PT) and contractional work (CW) of the triceps surae muscle have been measured in 24 patients with peripheral arterial insufficiency and intermittent claudication and in 15 controls. Tests were performed both during non-fatiguing (30-180 degrees/s) and fatiguing (200 repeated plantar flexions at 60 degrees/s) conditions. The electromyographic signals (iEMG) from all three heads of the triceps surae were measured. The patients were significantly weaker (PT) and produced significantly less contractional work (CW) than the controls. In contrast, similar iEMGs of the triceps surae heads indicated similar levels of activation. At 40 contractions the majority of the patients had already given up and the remainder showed significantly greater declines in PT (50%) and CW (55%) than did the controls (13% and 18%, respectively). The decline in muscular excitations was similar in both groups. The ratio CW/iEMG showed a dramatic decline in the patients but was virtually constant in the controls. These results indicate a fatigue of low-frequency type in the patient group. There were close correlations between maximum walking tolerance and total work production.
对24例患有外周动脉供血不足和间歇性跛行的患者以及15名对照组人员的小腿三头肌等速跖屈峰值扭矩（PT）和收缩功（CW）进行了测量。在非疲劳状态（30 - 180度/秒）和疲劳状态（以60度/秒进行200次重复跖屈）下均进行了测试。测量了小腿三头肌所有三个头的肌电信号（iEMG）。患者的力量（PT）明显弱于对照组，产生的收缩功（CW）也明显少于对照组。相比之下，小腿三头肌各头相似的iEMG表明激活水平相似。在进行40次收缩时，大多数患者已经放弃，其余患者的PT（50%）和CW（55%）下降幅度明显大于对照组（分别为13%和18%）。两组肌肉兴奋性的下降相似。患者组的CW/iEMG比值显著下降，而对照组则基本保持不变。这些结果表明患者组存在低频类型的疲劳。最大行走耐力与总功产生之间存在密切相关性。
