Marsh R L, Olson J M, Guzik S K
Northeastern University, Department of Biology, Boston, Massachusetts 02115.
Nature. 1992 Jun 4;357(6377):411-3. doi: 10.1038/357411a0.
Mechanical performance of skeletal muscle has long been the subject of intense interest, but the details of in vivo performance of individual skeletal muscles during normal locomotion remain largely unknown. Performance in vitro has been described with considerable precision under simplified loading conditions. The force production and shortening velocity of most muscles, however, probably change continuously during natural movements. Therefore, modelling in vivo performance on the basis of in vitro contractile properties is subject to large degrees of uncertainty. Designing in vitro experiments that effectively examine the limits of mechanical performance requires increasing knowledge of precisely how muscles are used during normal movements. We report here measurements of the mechanical performance of the adductor muscle in scallops during jet-propulsion swimming. Swimming in scallops is powered solely by the striated portion of the single adductor muscle. Exploiting this simple locomotor morphology with simultaneous high-resolution measurements of pressure and flow rate, we have recorded nearly instantaneous measurements of the performance of a single skeletal muscle during normal locomotion.
骨骼肌的力学性能长期以来一直是人们密切关注的课题，但在正常运动过程中单个骨骼肌的体内性能细节仍 largely 未知。在简化的加载条件下，体外性能已被相当精确地描述。然而，大多数肌肉的力产生和缩短速度在自然运动过程中可能会不断变化。因此，基于体外收缩特性对体内性能进行建模存在很大程度的不确定性。设计能够有效检验力学性能极限的体外实验需要更多地了解肌肉在正常运动过程中的具体使用方式。我们在此报告了扇贝在喷气推进游泳过程中内收肌力学性能的测量结果。扇贝游泳完全由单一内收肌的横纹部分提供动力。利用这种简单的运动形态，同时对压力和流速进行高分辨率测量，我们记录了正常运动过程中单个骨骼肌性能的几乎即时测量结果。
