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Muscle oxygenation maintained during repeated-sprints despite inspiratory muscle loading

Rodriguez, Ramón F ; Townsend, Nathan E ; Aughey, Robert J ; Billaut, François Kerhervé, Hugo A.

PloS one, 2019-09, Vol.14 (9), p.e0222487-e0222487 [Periódico revisado por pares]

United States: Public Library of Science

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Título:
Muscle oxygenation maintained during repeated-sprints despite inspiratory muscle loading
Autor: Rodriguez, Ramón F ; Townsend, Nathan E ; Aughey, Robert J ; Billaut, François
Kerhervé, Hugo A.
Assuntos: Adult ; Biology and Life Sciences ; Blood ; Confidence limits ; Exercise ; Experiments ; Fatigue ; Hemoglobin ; Hemoglobins ; Hemoglobins - analysis ; High intensity interval training ; Humans ; Influence ; Infrared spectra ; Infrared spectroscopy ; Intercostal Muscles - metabolism ; Laboratories ; Male ; Males ; Medicine ; Medicine and Health Sciences ; Metabolism ; Muscle, Skeletal - metabolism ; Muscles ; Near infrared radiation ; Near infrared spectroscopy ; Oxygen ; Oxygen - metabolism ; Oxygenation ; Physical fitness ; Physical Sciences ; Physiology ; Quadriceps Muscle - metabolism ; Recovery ; Research and Analysis Methods ; Respiration ; Respiratory Function Tests ; Respiratory muscles ; Running - physiology ; Saturation index ; Spectroscopy ; Spectroscopy, Near-Infrared ; Spectrum analysis ; Sports medicine ; Townsend, Robert ; Trends
É parte de: PloS one, 2019-09, Vol.14 (9), p.e0222487-e0222487
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-News-1
ObjectType-Feature-3
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Competing Interests: The authors have read the journal's policy and have the following competing interests: NET is a paid employee of Aspetar Orthopaedic and Sports Medicine Hospital. This does not affect our adherence to PLOS ONE policies on sharing data and materials. There are no patents, products in development, or marketed products to declare. This does not alter our adherence to PLOS ONE policies on sharing data and materials.
Descrição: A high work of breathing can compromise limb oxygen delivery during sustained high-intensity exercise. However, it is unclear if the same is true for intermittent sprint exercise. This project examined the effect of adding an inspiratory load on locomotor muscle tissue reoxygenation during repeated-sprint exercise. Ten healthy males completed three experiment sessions of ten 10-s sprints, separated by 30-s of passive rest on a cycle ergometer. The first two sessions were "all-out' efforts performed without (CTRL) or with inspiratory loading (INSP) in a randomised and counterbalanced order. The third experiment session (MATCH) consisted of ten 10-s work-matched intervals. Tissue saturation index (TSI) and deoxy-haemoglobin (HHb) of the vastus lateralis and sixth intercostal space was monitored with near-infrared spectroscopy. Vastus lateralis reoxygenation (ΔReoxy) was calculated as the difference from peak HHb (sprint) to nadir HHb (recovery). Total mechanical work completed was similar between INSP and CTRL (effect size: -0.18, 90% confidence limit ±0.43), and differences in vastus lateralis TSI during the sprint (-0.01 ±0.33) and recovery (-0.08 ±0.50) phases were unclear. There was also no meaningful difference in ΔReoxy (0.21 ±0.37). Intercostal HHb was higher in the INSP session compared to CTRL (0.42 ±0.34), whilst the difference was unclear for TSI (-0.01 ±0.33). During MATCH exercise, differences in vastus lateralis TSI were unclear compared to INSP for both sprint (0.10 ±0.30) and recovery (-0.09 ±0.48) phases, and there was no meaningful difference in ΔReoxy (-0.25 ±0.55). Intercostal TSI was higher during MATCH compared to INSP (0.95 ±0.53), whereas HHb was lower (-1.09 ±0.33). The lack of difference in ΔReoxy between INSP and CTRL suggests that for intermittent sprint exercise, the metabolic O2 demands of both the respiratory and locomotor muscles can be met. Additionally, the similarity of the MATCH suggests that ΔReoxy was maximal in all exercise conditions.
Editor: United States: Public Library of Science
Idioma: Inglês

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Muscle oxygenation maintained during repeated-sprints despite inspiratory muscle loading

Rodriguez, Ramón F ; Townsend, Nathan E ; Aughey, Robert J ; Billaut, François Kerhervé, Hugo A.

United States: Public Library of Science

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