Deoxy[Hb+Mb] increases consistently up to peak oxygen consumption in elite cyclists
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This study aimed to compare deoxygenation in the vastus lateralis in the skeletal muscle microvasculature of nine world-class/elite (WC/E) vs. thirty-one well-trained/trained (T) cyclists by near infrared spectroscopy (NIRS) during a maximal aerobic power (MAP) test. Interaction analysis showed that 1st degree polynomial trends across % peak oxygen consumption (%VO2peak) differed significantly between WC/E and T cyclists on deoxygenated hemoglobin-myoglobin (Δ[HHb]) and on total hemoglobin-myoglobin (Δ[THb]) from 70 to 100% of VO2peak. These results show that the linear slopes of these trends were different. Near-plateau of Δ[HHb] was observed in T cyclists, whereas a consistent increase up to VO2peak was seen in WC/E cyclists. The Δ[THb] curve declined in T cyclists suggesting that blood volume in the vastus lateralis microcirculation decreases from 70 to 100% of VO2peak whereas it increases slowly but continuously to 95% of VO2peak in WC/E cyclists. The results of this study showed that deoxygenation in the vastus lateralis increases consistently up to VO2peak in WC/E cyclists and seems to be influenced by blood volume in the microcirculation.
Abstract
This study aimed to compare deoxygenation in the vastus lateralis in the skeletal muscle microvasculature of nine world-class/elite (WC/E) vs. thirty-one well-trained/trained (T) cyclists by near infrared spectroscopy (NIRS) during a maximal aerobic power (MAP) test. Interaction analysis showed that 1st degree polynomial trends across % peak oxygen consumption (%VO2peak) differed significantly between WC/E and T cyclists on deoxygenated hemoglobin-myoglobin (Δ[HHb]) and on total hemoglobin-myoglobin (Δ[THb]) from 70 to 100% of VO2peak. These results show that the linear slopes of these trends were different. Near-plateau of Δ[HHb] was observed in T cyclists, whereas a consistent increase up to VO2peak was seen in WC/E cyclists. The Δ[THb] curve declined in T cyclists suggesting that blood volume in the vastus lateralis microcirculation decreases from 70 to 100% of VO2peak whereas it increases slowly but continuously to 95% of VO2peak in WC/E cyclists. The results of this study showed that deoxygenation in the vastus lateralis increases consistently up to VO2peak in WC/E cyclists and seems to be influenced by blood volume in the microcirculation.
참고문헌 (29)
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