Nonuniform quadriceps O2 consumption revealed by near infrared multipoint measurements.
Single location muscle monitoring does not reflect the heterogeneous activation of the muscle group(s) during a given exercise. Vastus lateralis and rectus femoris O2 consumption (VO2) was investigated, noninvasively, at rest and during maximal voluntary contractions (MVC) using a 12-channel near-infrared continuous wave spectroscopy (NIR(CWS)) system (0.1 s acquisition time). VO2 either at rest or during MVC was found to be nonuniform in the 11 out of 12 measurement sites over a surface of 8 x 8 cm2. As expected, VO2 during exercise was significantly higher than VO2 at rest (P < 0.01). However, at each muscle measurement site no difference was found between the mean values (n = 12) of VO2 measured during a 5-s intermittent MVC and the VO2 values measured during 30-s continuous MVC (P = 0.25). These results strengthen the role of NIR(CWS) as a powerful tool for investigating the spatial and temporal features of muscle oxygenation changes as well as muscle VO2.
Quaresima
V
V
Department of Biomedical Sciences and Technologies, University of L'Aquila, L'Aquila, 67100, Italy. vale@univaq.it
Colier
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WN
van der Sluijs
M
M
Ferrari
M
M
D000328:Adult; D001785:Blood Gas Monitoring, Transcutaneous / Q000379:methods; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010100:Oxygen / Q000378:metabolism*; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation / Q000379:methods*; D013848:Thigh / Q000502:physiology; D014836:Volition
D010100:Oxygen