title: Whole-body active warm-up and inspiratory muscle warm-up do not improve running performance when carrying thoracic loads.
abstract: Whole-body active warm-ups (AWU) and inspiratory muscle warm-up (IMW) prior to exercise improves performance on some endurance exercise tasks. This study investigated the effects of AWU with and without IMW upon 2.4-km running time-trial performance while carrying a 25-kg backpack, a common task and backpack load in physically demanding occupations. Participants (n = 9) performed five 2.4-km running time-trials with a 25-kg thoracic load preceded in random order by (i) IMW comprising 2 × 30 inspiratory efforts against a pressure-threshold load of 40% maximal inspiratory pressure (PImax), (ii) 10-min unloaded running (AWU) at lactate turnpoint (10.33 ± 1.58 km·h-1), (iii) placebo IMW (PLA) comprising 5-min breathing using a sham device, (iv) AWU+IMW, and (v) AWU+PLA. Pooled baseline PImaxwas similar between trials and increased by 7% and 6% following IMW and AWU+IMW (P < 0.05). Relative to baseline, pooled PImaxwas reduced by 9% after the time-trial, which was not different between trials (P > 0.05). Time-trial performance was not different between any trials. Whole-body AWU and IMW performed alone or combination have no ergogenic effect upon high-intensity, short-duration performance when carrying a 25-kg load in a backpack.
authors.affiliation: a College of Life and Natural Sciences, University of Derby, Derby DE22 1GB, UK.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Faghy
authors.affiliation: b English Institute of Sport, Loughborough High Performance Centre, Loughborough Leicestershire LE11 3TU, UK.
authors.forename: Peter I
authors.initials: PI
authors.lastname: Brown
mesh_terms: D000293:Adolescent; D000328:Adult; D054874:Athletic Performance; D001823:Body Composition; D017097:Electric Impedance; D006801:Humans; D008297:Male; D012132:Respiratory Muscles / Q000502:physiology*; D012420:Running; D063996:Warm-Up Exercise / Q000502:physiology*; D055815:Young Adult
keywords: exercise performance; inspiratory muscle warm-up; load carriage; performance physique; port de charge; respiratory system; système respiratoire; échauffement des muscles inspiratoires