title: Effect of resistance training on phase angle in older women: A randomized controlled trial.
abstract: 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/m2) 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.
authors.affiliation: Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Parana, Brazil.
authors.forename: M F
authors.initials: MF
authors.lastname: Souza
authors.affiliation: Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Parana, Brazil.
authors.forename: C M
authors.initials: CM
authors.lastname: Tomeleri
authors.affiliation: Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Parana, Brazil.
authors.forename: A S
authors.initials: AS
authors.lastname: Ribeiro
authors.affiliation: Exercise Science Department, CUNY Lehman College, Bronx, New York, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Schoenfeld
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, Universidade de Lisboa, Lisbon, Portugal.
authors.forename: A M
authors.initials: AM
authors.lastname: Silva
authors.affiliation: Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, Universidade de Lisboa, Lisbon, Portugal.
authors.forename: L B
authors.initials: LB
authors.lastname: Sardinha
authors.affiliation: Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Parana, Brazil.
authors.forename: E S
authors.initials: ES
authors.lastname: Cyrino
mesh_terms: D000368:Aged; D001823:Body Composition; D001834:Body Water; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength; D055070:Resistance Training
keywords: Aging; cellular hydration; skeletal muscle; spectral bioimpedance; strength training