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Power output at the moderate-to-heavy intensity transition decreases in a non-linear fashion during prolonged exercise.
Gallo, Gabriele; Faelli, Emanuela Luisa; Ruggeri, Piero; Filipas, Luca; Codella, Roberto; Plews, Daniel J; Maunder, Ed.
Afiliación
  • Gallo G; Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
  • Faelli EL; Department of Neuroscience, RehabilitationGenoa, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Viale Benedetto XV, 16100, Genoa, Italy.
  • Ruggeri P; Department of Experimental Medicine, University of Genoa, Genoa, Italy. emanuela.faelli@unige.it.
  • Filipas L; Department of Experimental Medicine, University of Genoa, Genoa, Italy.
  • Codella R; Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Milan, Italy.
  • Plews DJ; Department of Endocrinology, Nutrition and Metabolic Diseases, IRCCS MultiMedica, Milan, Italy.
  • Maunder E; Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Milan, Italy.
Eur J Appl Physiol ; 124(8): 2353-2364, 2024 Aug.
Article en En | MEDLINE | ID: mdl-38483635
ABSTRACT

PURPOSE:

The aims of this study were to (i) describe the time course of the decrease in power output at the moderate-to-heavy intensity transition during prolonged exercise; (ii) investigate the association between durability of the moderate-to-heavy intensity transition and exercise capacity; and (iii) explore physiological correlates of durability of the moderate-to-heavy intensity transition.

METHODS:

Twelve trained cyclists (age 40 ± 8 y, V ˙ O2peak 52.3 ± 5.2 mL·min-1·kg-1) performed an exhaustive cycling protocol involving alternating incremental exercise tests to determine power output at the moderate-to-heavy intensity transition via the first ventilatory threshold (VT1), and 30-min bouts at 90% of the power output at the previously estimated VT1 in the rested state. The individual time course of VT1 was modelled using linear and second-order polynomial functions, and time to a 5% decrease in VT1 (Δ5%VT1) was estimated using the best-fitting model.

RESULTS:

Power output at VT1 decreased according to a second-order polynomial function in 11 of 12 participants. Time-to-task failure (234 ± 66 min) was correlated with Δ5%VT1 (139 ± 78 min, rs = 0.676, p = 0.016), and these were strongly correlated with absolute and relative rates of fat oxidation at specific exercise intensities measured during the incremental test performed in the rested state.

CONCLUSIONS:

These data (i) identify a non-linear time course of decreases in the moderate-to-heavy intensity transition during prolonged exercise; (ii) support the importance of durability of the moderate-to-heavy intensity transition in prolonged exercise capacity; and (iii) suggest durability of the moderate-to-heavy intensity transition is related to fat oxidation rates.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Consumo de Oxígeno Límite: Adult / Humans / Male / Middle aged Idioma: En Revista: Eur J Appl Physiol Asunto de la revista: FISIOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: Nueva Zelanda Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Consumo de Oxígeno Límite: Adult / Humans / Male / Middle aged Idioma: En Revista: Eur J Appl Physiol Asunto de la revista: FISIOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: Nueva Zelanda Pais de publicación: Alemania