Our purpose is to compare the changes in muscle oxygenation in the vastus lateralis (VL) and biceps brachii (BB) muscles simultaneously using near-infrared spectroscopy (NIRS) during incremental rowing exercise in eight rowers. Based on the BB and VL muscle oxygenation patterns, two points are used to characterize the muscle oxygenation kinetics in both the arm and the leg muscles. The first point is the breaking point (Bp), which refers to an accelerated fall in muscle oxygenation that correlates with the gas exchange threshold (GET). The second point is the leveling-off point (Lo), which suggests the upper limit of O2 extraction. The GET occurred at 63.3±2.4% of maximal oxygen uptake (O2 max). The Bp appeared at 45.0±3.8% and 55.6±2.4% O2 max in the BB and VL, respectively. The Lo appeared at 63.6±4.1% and 86.6±1.0% O2 max in these two muscles, respectively. Both the Bp and the Lo occurred earlier in BB compared with VL. These results suggest that arm muscles have lower oxidative capacity than leg muscles during rowing exercise. The rowers with higher exercise performances showed heavier workloads, as evaluated by Bp and Lo. The monitoring of muscle oxygenation by NIRS in arm and leg muscles during rowing could be a useful guide for evaluation and training.
For the purpose of comparing the response in local skeletal muscle oxygenation and blood lactate concentration during
incremental exercise, 8 female finswimmers were recruited to take an incremental exercise on a cycle ergometer. Muscle
oxygenation in right vastus lateralis (VL) were monitored by continuous wave near infrared spectroscopy (CW NIRS),
respiratory gas exchange and blood lactate concentration ([La]b) were simultaneously measured by a metabolic system
and a portable blood lactate analyzer respectively. NIRS measurements showed a muscle oxygenation index inflection
point (OIip), from which the muscle oxygenation started to decrease dramatically. Significant correlations have been
found between OIip and blood lactate threshold identified at the lowest [La]b value which was >0.5 mmol/L lower than
that obtained at the following workload. These results might suggest that the CW NIRS measurement could be applied to
monitor lactate threshold noninvasively.
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