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Prolonged exercise shifts ventilatory parameters at the moderate-to-heavy intensity transition.
Stevenson, Julian D; Kilding, Andrew E; Plews, Daniel J; Maunder, Ed.
Afiliação
  • Stevenson JD; Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
  • Kilding AE; Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
  • Plews DJ; Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
  • Maunder E; Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand. ed.maunder@aut.ac.nz.
Eur J Appl Physiol ; 124(1): 309-315, 2024 Jan.
Article em En | MEDLINE | ID: mdl-37495864
PURPOSE: To quantify the effects of prolonged cycling on the rate of ventilation ([Formula: see text]), frequency of respiration (FR), and tidal volume (VT) associated with the moderate-to-heavy intensity transition. METHODS: Fourteen endurance-trained cyclists and triathletes (one female) completed an assessment of the moderate-to-heavy intensity transition, determined as the first ventilatory threshold (VT1), before (PRE) and after (POST) two hours of moderate-intensity cycling. The power output, [Formula: see text], FR, and VT associated with VT1 were determined PRE and POST. RESULTS: As previously reported, power output at VT1 significantly decreased by ~ 10% from PRE to POST. The [Formula: see text] associated with VT1 was unchanged from PRE to POST (72 ± 12 vs. 69 ± 13 L.min-1, ∆ - 3 ± 5 L.min-1, ∆ - 4 ± 8%, P = 0.075), and relatively consistent (within-subject coefficient of variation, 5.4% [3.7, 8.0%]). The [Formula: see text] associated with VT1 was produced with increased FR (27.6 ± 5.8 vs. 31.9 ± 6.5 breaths.min-1, ∆ 4.3 ± 3.1 breaths.min-1, ∆ 16 ± 11%, P = 0.0002) and decreased VT (2.62 ± 0.43 vs. 2.19 ± 0.36 L.breath-1, ∆ - 0.44 ± 0.22 L.breath-1, ∆ - 16 ± 7%, P = 0.0002) in POST. CONCLUSION: These data suggest prolonged exercise shifts ventilatory parameters at the moderate-to-heavy intensity transition, but [Formula: see text] remains stable. Real-time monitoring of [Formula: see text] may be a useful means of assessing proximity to the moderate-to-heavy intensity transition during prolonged exercise and is worthy of further research.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Exercício Físico / Treino Aeróbico Limite: Female / Humans Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Exercício Físico / Treino Aeróbico Limite: Female / Humans Idioma: En Ano de publicação: 2024 Tipo de documento: Article