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Accelerated point of muscle deoxygenation during the 20‐m shuttle run test
Author(s) -
Kume Daisuke,
Iguchi Akira,
Endoh Hiroshi
Publication year - 2018
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12426
Subject(s) - deoxygenation , medicine , oxygenation , vastus lateralis muscle , deoxygenated hemoglobin , anatomy , nuclear medicine , biochemistry , hemoglobin , chemistry , skeletal muscle , catalysis
Summary This study examined whether the point of accelerated deoxygenation of active muscle occurs during the 20‐m shuttle run test (20m SRT ) and, if so, whether it is associated with exercise performance in the test. Twenty‐nine male subjects performed the 20m SRT , and concentration changes in oxyhaemoglobin (ΔOxy‐Hb) and deoxyhaemoglobin (ΔDeoxy‐Hb) in the m. vastus lateralis were measured using a portable near‐infrared spectroscopy device. The difference between the relative concentration changes in ΔOxy‐Hb and ΔDeoxy‐Hb (Δ[Oxy‐Hb − Deoxy‐Hb]) was regarded as the muscle oxygenation index. Group‐averaged Δ[Oxy‐Hb − Deoxy‐Hb] showed progressive decrease during the test. However, among the individuals, we found an accelerated point of decrease in Δ[Oxy‐Hb − Deoxy‐Hb] in 20 subjects, which revealed that the laps at the accelerated point correlated with the total laps ( r = 0·78). These results demonstrate that the accelerated deoxygenation of active muscle occurs during the 20m SRT , but not in all cases. Our findings also indicate that if the accelerated point of muscle deoxygenation occurs, the timing of its appearance is related to 20m SRT performance.