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Resistance training promotes increase in intracellular hydration in men and women

Article (PDF Available) inEuropean Journal of Sport Science 14(6):578-585 · January 2014with390 Reads
DOI: 10.1080/17461391.2014.880192 · Source: PubMed
Abstract
The main purpose of the present study was to investigate the effect of 16 weeks of resistance training (RT) on body water in men and women. Thirty men (22.7 ± 4.4 years, 68.4 ± 9.0 kg and 174.5 ± 6.6 cm) and 34 women (22.7 ± 4.1 years, 58.8 ± 11.9 kg and 162.6 ± 6.2 cm) underwent progressive RT for 16 weeks (2 phases, 8 weeks each), 3 times per week, that consisted of 10-12 whole body exercises with 3 sets of 8-12 repetitions maximum. Total body water, TBW (intracellular water, ICW and extracellular water, ECW compartments) and skeletal muscle mass (SMM) were assessed using a spectral bioelectrical impedance device (Xitron 4200 Bioimpedance Spectrum Analyzer). TBW, ICW compartment and SMM increased significantly (P < 0.05) over time in men (+7.5%, +8.2% and +4.2%, respectively) and women (+7.6%, +11.0% +3.9%, respectively), with no sex by time interaction (P > 0.05). We conclude that progressive RT promotes an increase in body water, principally by intracellular content; however, the hydration status is not influenced by sex.
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Comments

February 9, 2018
Ghent University
Sarcoplasmatic hypertrophy is that a form of the increase in ICW? Of course the muscle fiber needs to increase in volume to be called "hypertrophic" (depending on the defintion ofcourse) So "cell swelling" could be seen as this?
Would intramuscular fat droplets storage also attracts more water?
In case of the increase of ICW, is that also not related to myonuclei? I recall that the volume controled by a myonuclei is static, so RT would give more myonuclei, so more potential for volume increase?
December 25, 2016
Lone Star College System
It might interesting to compare the results of 8-12 reps (8-12RM) with another group doing 3-5 reps (3-5RM) and see what if any difference there is intracellular hydration.
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