Journeay W Shane, Reardon Francis D, Martin C Ryan, Kenny Glen P
Laboratory of Human Bioenergetics and Environmental Physiology, School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada K1N 6N5.
J Appl Physiol (1985). 2004 Jun;96(6):2207-12. doi: 10.1152/japplphysiol.01201.2003. Epub 2004 Feb 6.
The purpose of the study was to examine the effect of 1) passive (assisted pedaling), 2) active (loadless pedaling), and 3) inactive (motionless) recovery modes on mean arterial pressure (MAP), skin blood flow (SkBF), and sweating during recovery after 15 min of dynamic exercise. It was hypothesized that an active recovery mode would be most effective in attenuating the fall in MAP, SkBF, and sweating during exercise recovery. Six male subjects performed 15 min of cycle ergometer exercise at 70% of their predetermined peak oxygen consumption followed by 15 min of 1) active, 2) passive, or 3) inactive recovery. Mean skin temperature (T(sk)), esophageal temperature (T(es)), SkBF, sweating, cardiac output (CO), stroke volume (SV), heart rate (HR), total peripheral resistance (TPR), and MAP were recorded at baseline, end exercise, and 2, 5, 8, 12, and 15 min postexercise. Cutaneous vascular conductance (CVC) was calculated as the ratio of laser-Doppler blood flow to MAP. In the active and passive recovery modes, CVC, sweat rate, MAP, CO, and SV remained elevated over inactive values (P < 0.05). The passive mode was equally as effective as the active mode in maintaining CO, SV, MAP, CVC, and sweat rate above inactive recovery. Sweat rate was different among all modes after 8 min of recovery (P < 0.05). TPR during active recovery remained significantly lower than during recovery in the passive and inactive modes (P < 0.05). No differences in either T(es) or T(sk) were observed among conditions. Given that MAP was higher during passive and active recovery modes than during inactive recovery suggests differences in CVC may be due to differences in baroreceptor unloading and not factors attributed to central command. However, differences in sweat rate may be influenced by factors such as central command and mechanoreceptor stimulation.
本研究的目的是探讨1）被动（辅助蹬车）、2）主动（无负荷蹬车）和3）不活动（静止）恢复模式对动态运动15分钟后恢复期间平均动脉压（MAP）、皮肤血流量（SkBF）和出汗的影响。研究假设，主动恢复模式在减轻运动恢复期间MAP、SkBF和出汗的下降方面最为有效。六名男性受试者以其预定峰值耗氧量的70%进行了15分钟的自行车测力计运动，随后进行15分钟的1）主动、2）被动或3）不活动恢复。在基线、运动结束时以及运动后2、5、8、12和15分钟记录平均皮肤温度（T(sk)）、食管温度（T(es)）、SkBF、出汗、心输出量（CO）、每搏输出量（SV）、心率（HR）、总外周阻力（TPR）和MAP。皮肤血管传导率（CVC）计算为激光多普勒血流与MAP的比值。在主动和被动恢复模式下，CVC、出汗率、MAP、CO和SV保持高于不活动时的值（P<0.05）。在维持CO、SV、MAP、CVC和出汗率高于不活动恢复方面，被动模式与主动模式同样有效。恢复8分钟后，所有模式下的出汗率不同（P<0.05）。主动恢复期间的TPR显著低于被动和不活动模式下的恢复期间（P<0.05）。各条件下未观察到T(es)或T(sk)的差异。鉴于被动和主动恢复模式下的MAP高于不活动恢复，表明CVC的差异可能是由于压力感受器卸载的差异，而非中枢指令因素所致。然而，出汗率的差异可能受中枢指令和机械感受器刺激等因素影响。
