Scott E E F, Hamilton D F, Wallace R J, Muir A Y, Simpson A H R W
University Hospital of North Durham, North Rd, Durham DH1 5TW, UK.
University of Edinburgh, Edinburgh EH16 4SB, UK.
Bone Joint Res. 2016 Feb;5(2):61-5. doi: 10.1302/2046-3758.52.2000484.
Temperature is known to influence muscle physiology, with the velocity of shortening, relaxation and propagation all increasing with temperature. Scant data are available, however, regarding thermal influences on energy required to induce muscle damage.
Gastrocnemius and soleus muscles were harvested from 36 male rat limbs and exposed to increasing impact energy in a mechanical test rig. Muscle temperature was varied in 5°C increments, from 17°C to 42°C (to encompass the in vivo range). The energy causing non-recoverable deformation was recorded for each temperature. A measure of tissue elasticity was determined via accelerometer data, smoothed by low-pass fifth order Butterworth filter (10 kHz). Data were analysed using one-way analysis of variance (ANOVA) and significance was accepted at p = 0.05.
The energy required to induce muscle failure was significantly lower at muscle temperatures of 17°C to 32°C compared with muscle at core temperature, i.e., 37°C (p < 0.01). During low-energy impacts there were no differences in muscle elasticity between cold and warm muscles (p = 0.18). Differences in elasticity were, however, seen at higher impact energies (p < 0.02).
Our findings are of particular clinical relevance, as when muscle temperature drops below 32°C, less energy is required to cause muscle tears. Muscle temperatures of 32°C are reported in ambient conditions, suggesting that it would be beneficial, particularly in colder environments, to ensure that peripheral muscle temperature is raised close to core levels prior to high-velocity exercise. Thus, this work stresses the importance of not only ensuring that the muscle groups are well stretched, but also that all muscle groups are warmed to core temperature in pre-exercise routines.Cite this article: Professor A. H. R. W. Simpson. Increased risk of muscle tears below physiological temperature ranges. Bone Joint Res 2016;5:61-65. doi: 10.1302/2046-3758.52.2000484.
已知温度会影响肌肉生理机能，缩短、松弛及传导速度均会随温度升高而加快。然而，关于热对引发肌肉损伤所需能量的影响，现有数据匮乏。
从36只雄性大鼠的四肢获取腓肠肌和比目鱼肌，并在机械试验台上使其受到逐渐增加的冲击能量。肌肉温度以5°C为增量进行变化，范围从17°C至42°C（涵盖体内温度范围）。记录每个温度下导致不可恢复变形的能量。通过加速度计数据确定组织弹性的测量值，并使用五阶低通巴特沃斯滤波器（10 kHz）进行平滑处理。数据采用单因素方差分析（ANOVA）进行分析，p = 0.05时认为具有显著性。
与核心温度即37°C的肌肉相比，在17°C至32°C的肌肉温度下，引发肌肉衰竭所需的能量显著更低（p < 0.01）。在低能量冲击期间，冷肌肉和热肌肉之间的肌肉弹性没有差异（p = 0.18）。然而，在较高冲击能量下可观察到弹性差异（p < 0.02）。
我们的研究结果具有特殊的临床意义，因为当肌肉温度降至32°C以下时，引发肌肉撕裂所需的能量更少。据报道，在环境条件下肌肉温度可达32°C，这表明在高速运动前确保外周肌肉温度升高至接近核心温度水平将是有益的，特别是在较寒冷的环境中。因此，这项工作强调了不仅要确保肌肉群充分伸展，还要在运动前常规操作中将所有肌肉群预热至核心温度的重要性。引用本文：A. H. R. W. 辛普森教授。生理温度范围以下肌肉撕裂风险增加。《骨与关节研究》2016；5：61 - 65。doi：10.1302/2046 - 3758.52.2000484。
Zotero 插件
