The prefrontal oxygenation and ventilatory responses at start of one-legged cycling exercise have relation to central command
The prefrontal oxygenation and ventilatory responses at start of one-legged cycling exercise have relation to central command
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DOI：
10.1152/japplphysiol.00401.2016
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发表时间：
2016-11-01
影响因子：
3.3
通讯作者：
Endo, Kana
中科院分区：
文献类型：
--
作者：
Asahara, Ryota;Matsukawa, Kanji;Endo, Kana
任意运动时，中枢指令的激活应在运动开始前开始，而当运动被迫从提示开始时，中枢指令的激活应延迟。我们通过比较运动中的反应与任意启动和线索启动，来检验中枢指令的提前激活是否影响了呼吸反应并反映在额叶前部的氧合上。测定单腿骑行时的呼吸呼吸变量和前额氧合血红蛋白浓度(Oxy-Hb)。在任意单腿骑行开始时，每分钟通气量(VE)的增加幅度大于线索自行车，而呼气末二氧化碳分压(Etco(2))下降，而与任意或线索开始无关。在任意单腿骑行之前和开始时，双侧前额叶Oxy-Hb出现对称性增加，而提示开始时这种增加是不存在的。前额叶氧合增加的时间进程和幅度不受主观感觉疲劳程度的影响，与先前报道的两足自行车前额叶氧合增加的时间进程和幅度相同。心理想象或单腿骑自行车的被动表现增加了VE，降低了ETCO(2)。然而，这两种干预都没有增加额叶前部的氧合血红蛋白。ETCO(2)的变化不能解释主动或被动单足骑行时额叶前部的氧合反应。综上所述，中枢指令的提前激活可能通过增强单腿自行车运动开始时的分钟通气量来影响呼吸反应，并反映在运动前前额叶氧合的增加上。
When performing exercise arbitrarily, activation of central command should start before the onset of exercise, but when exercise is forced to start with cue, activation of central command should be delayed. We examined whether the in- advance activation of central command influenced the ventilatory response and reflected in the prefrontal oxygenation, by comparing the responses during exercise with arbitrary and cued start. The breathby- breath respiratory variables and the prefrontal oxygenated- hemoglobin concentration (Oxy- Hb) were measured during one- legged cycling. Minute ventilation (VE) at the onset of arbitrary one- legged cycling was augmented to a greater extent than cued cycling, while end- tidal carbon dioxide tension (ETco(2)) decreased irrespective of arbitrary or cued start. Symmetric increase in the bilateral prefrontal Oxy- Hb occurred before and at the onset of arbitrary one- legged cycling, whereas such an increase was absent with cued start. The time course and magnitude of the increased prefrontal oxygenation were not influenced by the extent of subjective rating of perceived exertion and were the same as those of the prefrontal oxygenation during two- legged cycling previously reported. Mental imagery or passive performance of the one- legged cycling increased VE and decreased ETco(2). Neither intervention, however, augmented the prefrontal Oxy- Hb. The changes in ETco(2) could not explain the prefrontal oxygenation response during voluntary or passive one- legged cycling. Taken together, it is likely that the in- advance activation of central command influenced the ventilatory response by enhancing minute ventilation at the onset of one- legged cycling exercise and reflected in the preexercise increase in the prefrontal oxygenation.