<i>In vivo</i> quantitative near‐infrared spectroscopy in skeletal muscle during incremental isometric handgrip exercise

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<jats:p>The aim of this study was to investigate the performance of <jats:italic>in vivo</jats:italic> quantitative near‐infrared spectroscopy (NIRS) in skeletal muscle at various workloads. NIRS was used for the quantitative measurement of O<jats:sub>2</jats:sub> consumption (mV˙O<jats:sub>2</jats:sub>) in the human flexor digitorum superficialis muscle at rest and during rhythmic isometric handgrip exercise in a broad range of work intensities (10–90% MVC=maximum voluntary contraction force). Six subjects were tested on three separate days. No significant differences were found in mV˙O<jats:sub>2</jats:sub> measured over different days with the exception of the highest workload. The within‐subject variability for each workload measured over the three measurements days ranged from 15·7 to 25·6% and did not increase at the high workloads. The mV˙O<jats:sub>2</jats:sub> was 0·14 ± 0·01 mlO<jats:sub>2</jats:sub> min<jats:sup>–1</jats:sup> 100 g<jats:sup>–1</jats:sup> at rest and increased roughly 19 times to 2·68 ± 0·58 mlO<jats:sub>2</jats:sub> min<jats:sup>–1</jats:sup> 100 g<jats:sup>–1</jats:sup> at 72% MVC. These results show that local muscle oxygen consumption at rest as well as during exercise at a broad range of work intensities can be measured reliably by NIRS, applied to a uniform selected subject population. This is of great importance as direct local measurement of mV˙O<jats:sub>2</jats:sub> during exercise is not possible with the conventional techniques. The method is robust enough to measure over separate days and at various workloads and can therefore contribute to a better understanding of human physiology in both the normal and pathological state of the muscle.</jats:p>

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