Abstract
The main purpose of the present study was to investigate the effect of a hypertrophy-type
resistance training protocol on phase angle, an indicator of cellular integrity, in
young adult men and women. 28 men (22.2±4.3 years, 67.8±9.0 kg and 174.2±6.8 cm) and
31 women (23.2±4.1 years, 58.7±12.1 kg and 162.7±6.4 cm) underwent a progressive RT
for 16 weeks (2 phases, 8 weeks each), 3 times per week, consisting of 10 to 12 whole
body exercises with 3 sets of 8–12 repetitions maximum. Phase angle, resistance, reactance
and total body water (intra and extracellular water compartments) were assessed by
bioimpedance spectroscopy (Xitron 4200 Bioimpedance Spectrum Analyzer). Total body
water, intracellular water and phase angle increased significantly (P<0.05) in men (7.8, 8.3, and 4.3%, respectively) and women (7.6, 11.7, and 5.8% respectively),
with no significant difference between sexes (P>0.05). Bioimpedance resistance decreased (P<0.05) similarly in both sex (men=−4.8%, women=−3.8%). The results suggest that regardless
of sex, progressive RT induces an increase in phase angle and a rise in cellular hydration.
Key words
strength training - phase angle skeletal muscle - cellular hydration - spectral bioimpedance