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Effect of resistance training on phase angle in older women: A randomized controlled trial
Author(s) -
Souza M. F.,
Tomeleri C. M.,
Ribeiro A. S.,
Schoenfeld B. J.,
Silva A. M.,
Sardinha L. B.,
Cyrino E. S.
Publication year - 2017
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12745
Subject(s) - bioelectrical impedance analysis , medicine , phase angle (astronomy) , body water , resistance training , physical therapy , randomized controlled trial , body weight , body mass index , physics , astronomy
Phase angle (PhA) is an angular‐derived bioelectrical impedance parameter based on resistance and reactance that has been widely used in different populations as an objective indicator of cellular health. The purpose of this study was to analyze the effect of resistance training ( RT ) on PhA in older women. Forty‐one older women (67.2 ± 4.5 years, 64.0 ± 12.3 kg, 154.7 ± 5.2 cm, and 26.6 ± 4.8 kg/m 2 ) were randomly assigned to one of two groups: a training group ( TG , n = 19) that underwent progressive RT for 12 weeks (eight exercises, three sets of 10–15 repetitions maximum, three times per week) or a control group ( CG , n = 22) that did not perform any type of exercise during the intervention period. Resistance, reactance, PhA, total body water ( TBW ), intracellular ( ICW ) and extracellular ( ECW ) water were assessed by spectral bioelectrical impedance. There was a significant group by time interaction ( P < 0.05) for PhA, TBW , and ICW in which only the TG increased their scores after the intervention period (PhA = +6.5%, TBW = +2.8%, and ICW = +5.1%). The results suggest that progressive RT promotes an increase in PhA in older women. Therefore, the PhA seems to be a good parameter to assess changes in cellular health during RT intervention.