Department of Automation, Biocybernetics and Robotics, Jozef Stefan Institute, Ljubljana, Slovenia.
Respir Physiol Neurobiol. 2011 Feb 15;175(2):247-54. doi: 10.1016/j.resp.2010.11.009. Epub 2010 Nov 26.
The purpose of the study was to investigate the effect of 30-min voluntary hyperpnoea on cerebral, respiratory and leg muscle balance between O(2) delivery and utilization during a subsequent constant-power test. Eight males performed a V˙O(2max) test, and two exercise tests at 85% of peak power output: (a) a control constant-power test (CPT), and (b) a constant-power test after a respiratory maneuver (CPT(RM)). Oxygenated (Δ[O(2)Hb]), deoxygenated (Δ[HHb]) and total (Δ[tHb]) hemoglobin in cerebral, intercostal and vastus lateralis were monitored with near-infrared spectroscopy. The performance time dropped ∼15% in CPT(RM) (6:55±2:52min) compared to CPT (8:03±2:33min), but the difference was not statistically significant. The vastus lateralis and intercostal Δ[tHb] and Δ[HHb] were lower in CPT(RM) than in CPT (P≤0.05). There were no differences in cerebral oxygenation between the trials. Thus, respiratory work prior to an exercise test influences the oxygenation during exercise in the leg and respiratory muscles, but not in the frontal cortex.
本研究旨在探讨 30 分钟自愿性过度通气对随后进行的恒功率测试中脑、呼吸和腿部肌肉之间氧输送和利用平衡的影响。8 名男性进行了 V˙O2max 测试，并进行了两次 85%峰值功率输出的运动测试：（a）对照恒功率测试（CPT），和（b）呼吸动作后的恒功率测试（CPT（RM））。使用近红外光谱监测脑、肋间肌和股外侧肌中的氧合（Δ[O2Hb]）、去氧（Δ[HHb]）和总血红蛋白（Δ[tHb]）。与 CPT（8:03±2:33min）相比，CPT（RM）中的运动时间下降了约 15%（6:55±2:52min），但差异无统计学意义。CPT（RM）中股外侧肌和肋间肌的 Δ[tHb]和 Δ[HHb]低于 CPT（P≤0.05）。两次试验之间的脑氧合没有差异。因此，运动前的呼吸工作会影响腿部和呼吸肌的运动期间的氧合，但不会影响额叶皮质的氧合。
