Temporal increase in muscle cross-sectional area as an acute effect of resistance exercise in resistance-trained and untrained individuals

Masahiro Goto, Hitoshi Kumada, Chikako Maeda, Yoshihiro Yamashina, Yosuke Yamato, Hiroto Honda, Hiroki Aoyama, Takafumi Hamaoka

Abstract

The purpose of this study was to compare the temporal increase in muscle cross-sectional area (CSA) as the acute response of resistance exercise (RE) between resistance-trained and untrained groups, and investigate the factors that affect the muscle CSA. Resistance-trained (n = 14) and untrained (n = 14) subjects performed four kinds of triceps brachii RE. Muscle CSA and intracellular hydration (IH), were measured prior to and 5-, 30-, and 60-minute after RE. Pearson's correlation coefficient was calculated to clarify the relationships among percent increases in muscle CSA and IH, area under the Oyx-Hb curve, blood lactate concentration, and % maximum voluntary contraction (MVC)-root-mean-square (RMS) of electromyogram (EMG). At 5-minute after RE, muscle CSA increased significantly to 120.2 ± 6.3% in the resistance-trained group and 105.5 ± 2.3% in the untrained group (p < 0.01). However, neither group showed a significant difference between the values before and 30-minute after RE. In the resistance-trained group, there was a significant increase in IH at 5-minute post-RH (p < 0.01), and correlations were found between percent increases in muscle CSA and IH (r = 0.70, p < 0.01), area under the Oxy-Hb curve (r = 0.77, p < 0.01), and % MVC-RMS of EMG (r = 0.72, p < 0.01). The findings of this study suggest that measurements of muscle CSA in studies of muscle hypertrophy should be performed 30-minute or more after the last resistance exercise session, and muscle pump exercises should be conducted just before participation in bodybuilding, and physique contests.


Keywords

Muscle hypertrophy; Oxygenated haemoglobin; Hypoxia; Intramuscular hydration; Muscle pump

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DOI: https://doi.org/10.14198/jhse.2020.152.19





License URL: https://creativecommons.org/licenses/by-nc-nd/4.0/