title: Physiological strain to prolonged exercise bouts at the walk-run transition speeds depends on locomotion mode in healthy untrained men.
abstract: This study compared the physiological strain induced by prolonged walking and running performed at the walk-run transition speed (WRTS) in healthy untrained men. Twenty volunteers (age: 28 ± 5.01 years; height: 174.0 ± 0.3 cm; body mass: 74.5 ± 0.6 kg) underwent the following: (a) ramp-incremental maximal cardiopulmonary exercise test (CPET); (b) specific protocol to detect the WRTS; and (c) two 30-min walking and running bouts at WRTS (mean ± SD: 6.9 ± 0.06 km/h). Expired gases were collected during exercise bouts via the metabolic cart. A significant effect of locomotion mode (F = 4.8, P < 0.001) was observed with running resulting in higher cardiorespiratory responses than walking at the WRTS (oxygen uptake: mean difference = 0.26 L/min; pulmonary ventilation: mean difference = 5.53 L/min; carbon dioxide output: mean difference = 0.32 L/min; heart rate: mean difference = 13 beats/min; total energy expenditure: mean difference = 59 kcal). The rating of perceived exertion was similar across locomotion modes (mean difference = 0.3; P = 0.490). In conclusion, running promoted greater cardiorespiratory responses than walking at the WRTS in untrained healthy men. These data might have practical impact on aerobic training performed at intensities corresponding to WRTS.
authors.affiliation: Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Niterói, Rio de Janeiro, Brazil.|Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil.
authors.forename: W D
authors.initials: WD
authors.lastname: Monteiro
authors.affiliation: Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil.|Rehabilitation Sciences Graduate Program, Augusto Motta University Center (UNISUAM), Rio de Janeiro, Brazil.
authors.forename: F A
authors.initials: FA
authors.lastname: Cunha
authors.affiliation: Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Niterói, Rio de Janeiro, Brazil.
authors.forename: E X
authors.initials: EX
authors.lastname: Ivo
authors.affiliation: Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Niterói, Rio de Janeiro, Brazil.|Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil.
authors.forename: R A
authors.initials: RA
authors.lastname: Freire
authors.affiliation: Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Niterói, Rio de Janeiro, Brazil.
authors.forename: B S
authors.initials: BS
authors.lastname: Silva
authors.affiliation: Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Niterói, Rio de Janeiro, Brazil.|Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil.
authors.forename: P
authors.initials: P
authors.lastname: Farinatti
mesh_terms: D000328:Adult; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000502:physiology*; D012123:Pulmonary Ventilation; D012420:Running / Q000502:physiology*; D016138:Walking / Q000502:physiology*; D055815:Young Adult
keywords: aerobic training; energy expenditure; gait; heart rate; oxygen consumption; perceived exertion