Muscle Oxygenation Responses to Low-intensity Steady Rate Concentric and Eccentric Cycling

作者：Rakobowchuk Mark; Isacco Laurie; Ritter Ophelie; Gonzalez Represas Alicia; Bouhaddi Malika; Degano Bruno; Tordi Nicolas; Mourot Laurent^*

来源：International Journal of Sports Medicine, 2018, 39(3): 173-180.

DOI：10.1055/s-0043-121272

• Tissue saturation index
• cardiovascular
• vascular conductance
• near infra-red spectroscopy
• negative muscle work
• oxygen uptake

Muscle deoxygenation responses provide information about the training impulse of an exercise session enabling adaptation to be predicted. Our aim was to investigate muscle oxygenation profiles during prolonged low-intensity eccentric and concentric cycling. Twelve healthy men performed two 45-min exercise sessions of concentric (CON) and eccentric (ECC) cycling, matched for the same heart rate at the start of each session. Mechanical power output during ECC was similar to 2.5 times that of CON (210 +/- 40W vs. 82 +/- 16 W). Oxygen uptake, blood lactate, cardiac output and systolic arterial pressure responses did not differ between exercises. Heart rate was similar at 5min of each exercise bout but progressively increased during ECC and was higher at 15, 30 and 45min of ECC compared to CON (+10bpm), with a trend for a lower stroke volume. Diastolic and mean blood pressures were higher during ECC. No significant differences were observed in muscle oxygenation profiles. Muscle oxygenation responses during prolonged low-intensity exercise were not affected by the type of muscle action at the same metabolic demand and cardiac output.

• 出版日期2018-2