Kruse Nicholas T, Scheuermann Barry W
Cardiopulmonary and Metabolism Research Laboratory, Department of Kinesiology, University of Toledo, Toledo, OH, USA.
Clin Physiol Funct Imaging. 2016 Mar;36(2):126-33. doi: 10.1111/cpf.12205. Epub 2014 Oct 17.
This study determined human skeletal muscle oxygenation dynamics during and after a single bout of self-administered stretching (SAS) of the plantar flexors. Nine healthy recreationally fit men (n = 7; age = 25·7 years) and women (n = 2; age = 23·5 years) performed two protocols: (i) one bout of SAS for 4 min and (ii) one bout of moderate intensity cycling for 4 min. We used near infrared spectroscopy to measure changes in muscle deoxygenated haemoglobin-myoglobin ([HHb]) and blood volume ([Hbtot ]) of gastrocnemius medialis muscle before, during and after stretching. The SAS caused an increase (P<0·05) in [HHb] during stretching between 60 and 240 s relative to baseline, but not at 30 s. No significant difference was found for [Hbtot ] at any time interval during SAS. Furthermore, the increase in local blood flow (suggested by [Hbtot ] changes) was found to be significantly increased relative to baseline at 1, 5 and 10 min after SAS, thus providing novel evidence for a poststretch hyperaemia. No significant interaction for [HHb] was found between stretching and cycling conditions, suggesting that the metabolic disturbance during stretching closely resembles moderate intensity exercise. These findings suggest that a single self-administered stretch for 60 s can produce a substantial microcirculatory event and that blood flow may be enhanced for up to 10 min after stretching.
本研究测定了单次自我进行的跖屈肌拉伸（SAS）期间及之后人体骨骼肌的氧合动力学。九名健康的、有一定运动能力的男性（n = 7；年龄 = 25.7岁）和女性（n = 2；年龄 = 23.5岁）进行了两项实验方案：（i）一次4分钟的SAS；（ii）一次4分钟的中等强度骑行。我们使用近红外光谱法测量了内侧腓肠肌在拉伸前、拉伸期间和拉伸后的肌肉脱氧血红蛋白-肌红蛋白（[HHb]）和血容量（[Hbtot]）的变化。与基线相比，SAS在拉伸60至240秒期间导致[HHb]增加（P<0.05），但在30秒时没有增加。在SAS期间的任何时间间隔，[Hbtot]均未发现显著差异。此外，发现局部血流增加（由[Hbtot]变化表明）在SAS后1、5和10分钟相对于基线显著增加，从而为拉伸后充血提供了新的证据。在拉伸和骑行条件之间未发现[HHb]的显著相互作用，这表明拉伸期间的代谢紊乱与中等强度运动非常相似。这些发现表明，单次60秒的自我拉伸可产生显著的微循环事件，并且拉伸后血流可能会增强长达10分钟。
