A Ramp versus Step Transition to Constant Work Rate Exercise Decreases Steady-State Oxygen Uptake

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Autor(es): dc.contributorUniversity of Calgary-
Autor(es): dc.contributorUniversity of Western Ontario-
Autor(es): dc.contributorLawson Health Research Institute-
Autor(es): dc.contributorToronto General Hospital-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorHamad Bin Khalifa University-
Autor(es): dc.creatorMarinari, Gabriele-
Autor(es): dc.creatorIannetta, Danilo-
Autor(es): dc.creatorHolash, Robert John-
Autor(es): dc.creatorTrama, Robin-
Autor(es): dc.creatorFaricier, Robin-
Autor(es): dc.creatorZagatto, Alessandro M.-
Autor(es): dc.creatorKeir, Daniel A.-
Autor(es): dc.creatorMurias, Juan M.-
Data de aceite: dc.date.accessioned2025-08-21T20:43:26Z-
Data de disponibilização: dc.date.available2025-08-21T20:43:26Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-05-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1249/MSS.0000000000003372-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/298992-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/298992-
Descrição: dc.descriptionWithin the initial minutes of square-wave exercise transitions above the moderate-intensity domain, the reliance on the anaerobic energy sources may induce some levels of metabolic instability; however, no study has attempted to limit metabolic instability at exercise onset by manipulating the exercise transition phase to a target work rate (WR). Purpose This study aimed to investigate whether a ramp-to-constant WR (rCWR) transition compared with a square-wave-to-constant WR (CWR) transition within the heavy-intensity domain can reduce metabolic instability and decrease the oxygen cost of exercise. Methods Fourteen individuals performed (i) a ramp-incremental test to task failure, (ii) a 21-min CWR within the heavy-intensity domain, and (iii) an rCWR to the same WR. Oxygen uptake (VO2), lactate concentration ([La-]), and muscle oxygen saturation (SmO2) were measured. VO2 and VO2 gain (VO2-G) during the first 10-min steady-state VO2 were analyzed. [La-] before, at, and after steady-state VO2 and SmO2 during the entire 21-min steady-state exercise were also examined. Results VO2 and VO2-G during rCWR (2.49 ± 0.58 L·min-1 and 10.7 ± 0.2 mL·min-1·W-1, respectively) were lower (P < 0.001) than CWR (2.57 ± 0.60 L·min-1 and 11.3 ± 0.2 mL·min-1·W-1, respectively). [La-] before and at steady-state VO2 during the rCWR condition (1.94 ± 0.60 and 3.52 ± 1.19 mM, respectively) was lower than the CWR condition (3.05 ± 0.82 and 4.15 ± 1.25 mM, respectively) (P < 0.001). [La-] dynamics after steady-state VO2 were unstable for the rCWR (P = 0.011). SmO2 was unstable within the CWR condition from minutes 4 to 13 (P < 0.05). Conclusions The metabolic disruption caused by the initial minutes of square-wave exercise transitions is a primary contributor to metabolic instability, leading to an increased VO2-G compared with the rCWR condition approach. The reduced early reliance on anaerobic energy sources during the rCWR condition may be responsible for the lower VO2-G.-
Descrição: dc.descriptionFaculty of Kinesiology University of Calgary-
Descrição: dc.descriptionSchool of Kinesiology University of Western Ontario-
Descrição: dc.descriptionLawson Health Research Institute-
Descrição: dc.descriptionToronto General Research Institute Toronto General Hospital-
Descrição: dc.descriptionLaboratory of Physiology and Sport Performance (LAFIDE) Department of Physical Education School of Sciences São Paulo State University-UNESP-
Descrição: dc.descriptionSchool of Health and Life Sciences Hamad Bin Khalifa University-
Descrição: dc.descriptionLaboratory of Physiology and Sport Performance (LAFIDE) Department of Physical Education School of Sciences São Paulo State University-UNESP-
Formato: dc.format972-981-
Idioma: dc.languageen-
Relação: dc.relationMedicine and Science in Sports and Exercise-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectANAEROBIC ENERGY SOURCES-
Palavras-chave: dc.subjectMUSCLE BIOENERGETICS-
Palavras-chave: dc.subjectMUSCLE OXYGEN SATURATION-
Palavras-chave: dc.subjectOXIDATIVE PHOSPHORYLATION-
Palavras-chave: dc.subjectOXYGEN COST-
Palavras-chave: dc.subjectOXYGEN UPTAKE SLOW COMPONENT-
Título: dc.titleA Ramp versus Step Transition to Constant Work Rate Exercise Decreases Steady-State Oxygen Uptake-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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