Effect of diurnal aerobic intervention on indicators of body composition of young women

ABSTRACT

The aim of this study was to compare the effect of morning and evening movement intervention on the following indicators of body composition: ratio (extracellular mass/body cell mass [ECM/BCM]), phase angle (PA), muscle mass (MM), and percentage of total body fat mass (FM%) in university female students with neutral chronotype who perform exercise in the morning (morning group [MG], n = 25, or evening (evening group [EG], n = 26). Statistical analysis did not show significant differences between the MG and EG: ECM/BCM, MG_PRE-POST -0.001 ± 0.10 vs. EG_PRE-POST -0.03 ± 0.07, t = -1.121, p > 0.05, d = 0.16; PA, MG_PRE-POST 0.18 ± 0.29 vs. EG_PRE-POST -0.28 ± 0.31, t = 1.201, p > 0.05, d = 0.17; MM, MG_PRE-POST 0.3 ± 1.2 vs. EG_PRE-POST 0.4 ± 1.0, t = 0.081, p > 0.05, d = 0.01; FM%, MG_PRE-POST -0.04 ± 1.5 vs. EG_PRE-POST -0.2 ± 1.3, t = -0.307, p > 0.05, d = 0.04. Results did not show significant difference in effect (p > 0.05) of morning and evening intervention on changes in body composition in the selected population.

KEYWORDS:

• Aerobic
• chronotype
• morning exercise
• evening exercise
• university female students

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by VEGA [grant number 1/0242/17], [grant number VEGA 1/0583/18], GAČR [grant number GA19-12150S] and Charles University [grant number UNCE HUM 32].