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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Demura S. 1, Aoki H. 2, Kawabata H. 1
1 Graduate School of Natural Science and Technology, Kanazawa University, Ishikawa, Japan;
2 Kanazawa College of Art, Ishikawa, Japan
Aim. This study aimed to compare muscle oxygenation kinetics and subjective muscle-fatigue sensation (SMS) during sustained muscle strength exertion using progressive workload method (PW) and a constant workload (CW) method with maximal voluntary contraction.
Methods. The subjects consisted of 15 healthy young males (mean age 24.5±4.4 yr, mean height 171.7±4.3 cm, mean mass 65.6±5.6 kg). All subjects were right-handed. The subjects performed maximal voluntary contractions (100%MVC) for 180 sec in the CW method and 20% MVC for 10 sec, then 30, 40, 50, 60, and 70% MVC each for 20 sec, and 80% MVC for 10 sec in the PW method. Measurements were taken during these activities for muscle oxygenation kinetics and SMS by using the Borg CR10 scale. The following were selected as evaluation parameters: time to reach minimum Oxygenation- Haemoglobin/ Myoglobin (Oxy-Hb/Mb), time to reach maximum Deoxygenation-Haemoglobin/ Myoglobin (Deoxy-Hb/Mb), average SMS and time at the highest SMS at 10 sec intervals. Time to reach minimum Oxy-Hb/Mb and time to reach maximum Deoxy-Hb/Mb were significantly lower with the CW method than with the PW method.
Results. A significant and moderate relationship was found between both workload methods in both parameters. Average SMS was significantly higher with the CW method, but the time at the highest SMS was significantly lower. A significant and moderate relationship was found between both workload methods in both parameters.
Conclusion. In conclusion, muscle oxygenation kinetics differ between the CW and PW methods during sustained muscle strength exertion. The PW method may result in less muscle pain and delay peak muscle fatigue.