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Gazzetta Medica Italiana Archivio per le Scienze Mediche 2017 March;176(3):92-9

DOI: 10.23736/S0393-3660.16.03333-7

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

Recovery time based on reoxygenation period from incremental test after sustained isometric trunk muscle contraction

Douglas MORI 1, Hiroshi SUMII 1, Mitsuhisa SHIOKAWA 2

1 Biological System Sciences, Prefectural University of Hiroshima, Hiroshima, Japan; 2 Faculty of Health and Welfare, Prefectural University of Hiroshima, Hiroshima, Japan


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BACKGROUND: Adjusting muscle function in vivo is important for understanding the mechanics and for developing appropriate assessment and training protocols, and treatments to prevent injuries. We hypothesized that after isometric sustained exercise, when oxygen demand is still high and oxygen supply is not completely restored, muscle may exhibit slower reoxygenation levels and a subsequent increase in half time to recovery (hTR).
METHODS: Eleven subjects performed static voluntary isometric contraction of the erector spinae muscle (ESM) in the prone position in six randomized time trials. Near infrared spectroscopy (NIRS) probes was used bilaterally at L3 (3 cm from the spinous process) to determine hTR. Electromyography (EMG) was used to quantify neuromuscular activity of the muscle using Fast fourier transform (FFT), and then the results were integrated to determine the median frequency (MF).
RESULTS: We found that a linear incremental isometric exercise time lead to a linear decrease in the slope for MF (EMG) and increase in hTR measured by NIRS. Therefore,518s and 593s was needed to recover half of the reoxygenation level from baseline by adding one second of isometric contraction, respectively to right and left ESM.
CONCLUSIONS: We showed the importance of maintaining muscle oxygenation between tasks after static contraction of the ESM. An understanding of the time to recovery after exercise might help comprehend the mechanisms of work/rest to prevent injury.


KEY WORDS: Isometric contraction - Spectroscopy, near-infrared - Electromyography

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