Respiratory Muscle Oxygenation Kinetics: Relationships with Breathing Pattern during Exercise

Abstract

This work aimed to investigate accessory respiratory muscle oxygenation (RMO₂) during exercise, using near-infrared spectroscopy, and to study relationships between RMO₂ kinetics and breathing parameters. Nineteen young males (19.3 ± 1.5 years) performed a maximal incremental test on a cycle ergometer. Changes in breathing pattern were characterized by accelerated rise in the breathing frequency (f_Racc), plateau of tidal volume (V_Tplateau) and inflection point in the V·_E/V_T relationship (V·_E/V_{T inflection}). First and second ventilatory thresholds (VT1 and VT2) were also determined. RMO₂ kinetics were monitored by NIRS on the serratus anterior. During exercise, all subjects showed reduced RMO₂ (deoxygenation) with a breakdown (B‐RMO₂) at submaximal workload (86 % V·O_2max). V·O₂ corresponding to B‐RMO₂ and to f_Racc, V_Tplateau, V·_E/V_{T inflection}, or VT2 were not different. Relationships were found between the V·O₂ at B‐RMO₂ and the V·O₂ at f_Racc (r = 0.88, p < 0.001), V_Tplateau (r = 0.84, p < 0.001), V·_E/V_{T inflection} (r = 0.58, p < 0.05) or VT2 (r = 0.79, p < 0.001). The amplitude of RMO₂ at maximal workload was weakly related to V·O_2max (r = 0.58, p < 0.05). B‐RMO₂ seems to be due to the change in breathing pattern and especially to the important rise in breathing frequency at the VT2 exercise level. Moreover, subjects who exhibit higher V·O_2max also exhibit a higher decrease in respiratory muscle oxygenation during exercise.

Key words

NIRS - ventilatory thresholds - breathing pattern - healthy young men - respiratory muscle oxygenation kinetics

References

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