Influence of dietary nitrate supplementation on physiological and muscle metabolic adaptations to sprint interval training
Autor: | Christopher Thompson, Sinead T. J. McDonagh, Matthew I. Black, James Kelly, Lee J. Wylie, Anni Vanhatalo, James M. Carter, Jamie R. Blackwell, Stephen J. Bailey, Andrew M. Jones, Jonathan Fulford |
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Přispěvatelé: | Human Physiology and Sports Physiotherapy Research Group, Physiotherapy, Human Physiology and Anatomy |
Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Adult
Male Muscle metabolism medicine.medical_specialty Physiology education Administration Oral 030204 cardiovascular system & hematology Beetroot Juice Athletic Performance High-Intensity Interval Training Placebo Interval training MUSCLE METABOLISM Running 03 medical and health sciences 0302 clinical medicine Oxygen Consumption Physiology (medical) Dietary Nitrate Task Performance and Analysis Journal Article Medicine Humans Controlled Clinical Trial Muscle Skeletal Beetroot juice supplementation Nitrates business.industry Oxygen metabolism 030229 sport sciences Adaptation Physiological Oxygen Physiological Adaptations Sprint Training adaptation Dietary Supplements Physical therapy business exercise training Research Article |
Popis: | We hypothesized that 4 wk of dietary nitrate supplementation would enhance exercise performance and muscle metabolic adaptations to sprint interval training (SIT). Thirty-six recreationally active subjects, matched on key variables at baseline, completed a series of exercise tests before and following a 4-wk period in which they were allocated to one of the following groups: 1) SIT and [Formula: see text]-depleted beetroot juice as a placebo (SIT+PL); 2) SIT and [Formula: see text]-rich beetroot juice (~13 mmol [Formula: see text]/day; SIT+BR); or 3) no training and [Formula: see text]-rich beetroot juice (NT+BR). During moderate-intensity exercise, pulmonary oxygen uptake was reduced by 4% following 4 wk of SIT+BR and NT+BR ( P < 0.05) but not SIT+PL. The peak work rate attained during incremental exercise increased more in SIT+BR than in SIT+PL ( P < 0.05) or NT+BR ( P < 0.001). The reduction in muscle and blood [lactate] and the increase in muscle pH from preintervention to postintervention were greater at 3 min of severe-intensity exercise in SIT+BR compared with SIT+PL and NT+BR ( P < 0.05). However, the change in severe-intensity exercise performance was not different between SIT+BR and SIT+PL ( P > 0.05). The relative proportion of type IIx muscle fibers in the vastus lateralis muscle was reduced in SIT+BR only ( P < 0.05). These findings suggest that BR supplementation may enhance some aspects of the physiological adaptations to SIT. NEW & NOTEWORTHY We investigated the influence of nitrate-rich and nitrate-depleted beetroot juice on the muscle metabolic and physiological adaptations to 4 wk of sprint interval training. Compared with placebo, dietary nitrate supplementation reduced the O2 cost of submaximal exercise, resulted in greater improvement in incremental (but not severe-intensity) exercise performance, and augmented some muscle metabolic adaptations to training. Nitrate supplementation may facilitate some of the physiological responses to sprint interval training. |
Databáze: | OpenAIRE |
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