Ballard R E, Watenpaugh D E, Breit G A, Murthy G, Holley D C, Hargens A R
Gravitational Research Branch, National Aeronautics and Space Adminstration-Ames Research Center, Moffett Field, 94035-1000, California.
J Appl Physiol (1985). 1998 Jun;84(6):1976-81. doi: 10.1152/jappl.1998.84.6.1976.
To assess the usefulness of intramuscular pressure (IMP) measurement for studying muscle function during gait, IMP was recorded in the soleus and tibialis anterior muscles of 10 volunteers during treadmill walking and running by using transducer-tipped catheters. Soleus IMP exhibited single peaks during late-stance phase of walking [181 +/- 69 (SE) mmHg] and running (269 +/- 95 mmHg). Tibialis anterior IMP showed a biphasic response, with the largest peak (90 +/- 15 mmHg during walking and 151 +/- 25 mmHg during running) occurring shortly after heel strike. IMP magnitude increased with gait speed in both muscles. Linear regression of soleus IMP against ankle joint torque obtained by a dynamometer produced linear relationships (n = 2, r = 0.97 for both). Application of these relationships to IMP data yielded estimated peak soleus moment contributions of 0.95-1.65 N . m/kg during walking, and 1.43-2.70 N . m/kg during running. Phasic elevations of IMP during exercise are probably generated by local muscle tissue deformations due to muscle force development. Thus profiles of IMP provide a direct, reproducible index of muscle function during locomotion in humans.
为评估肌内压（IMP）测量在研究步态期间肌肉功能方面的实用性，通过使用带传感器的导管，在10名志愿者的比目鱼肌和胫骨前肌中记录了跑步机行走和跑步过程中的IMP。比目鱼肌IMP在步行[181±69（SE）mmHg]和跑步（269±95 mmHg）的后期支撑阶段呈现单峰。胫骨前肌IMP表现出双相反应，最大峰值（步行时为90±15 mmHg，跑步时为151±25 mmHg）在足跟触地后不久出现。两块肌肉的IMP大小均随步态速度增加。比目鱼肌IMP与测力计测得的踝关节扭矩的线性回归产生了线性关系（n = 2，两者r = 0.97）。将这些关系应用于IMP数据得出，步行时比目鱼肌峰值力矩贡献估计为0.95 - 1.65 N·m/kg，跑步时为1.43 - 2.70 N·m/kg。运动期间IMP的阶段性升高可能是由于肌肉力量发展导致局部肌肉组织变形产生的。因此，IMP曲线提供了人类运动过程中肌肉功能的直接、可重复指标。
