随意筋収縮と強縮時の呼吸応答特性の検討

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This study examined comparative changes in respiratory responses (VE, Vo_2, Vco_2) between tetanic contractions and voluntary contractions. Eight healthy volunteers (male) performed dynamic voluntary contractions for 4 min at approximately 20% MVC level of the left upper leg (control side). During dynamic voluntary contractions (DVC), intermittent tetanic contractions for 2 min (approximately 40% MVC level) were induced in the triceps surae of the contralateral right lower leg (experimental side) by electric stimulation of the tibial nerve (300 μ sec, 20Hz, 10sec train), with and without an arterial tourniquet (280 Torr). In addition, heart rate (HR), EMG and evoked M response were measured in three different experiments. The magnitude of the initial ventilatory response increased more during DVC contractions alone. However, the later V_E response was independent of the influence of blood flow. HR responses were sightly increased for less than 30sec after onset during which V_E of the initial phase inreased strongly. However, the O_2 pulse increased more rapidly at the onset of DVC + tetanic contractions than by DVC contractions alone. The respiratory responses were not influenced by changes in the activation of the heart in this experiment. The V_E response delay (time constant) was shortened with DVC + teranic contractions compared to those with DVC alone. The relation between the time constant and the amplitude of M response (right triceps sure muscle) showed a negative correlation (P < 0.01). Thus, these results suggest that neural afferents from active muscles may quickly assume a fundamental role in the ventilatory response to tetanic contractions, while humoral pathways may a play a small role.
日本運動生理学会の論文
1995-08-31

随意筋収縮と強縮時の呼吸応答特性の検討

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