Creatine Supplementation Improves Phosphagen Energy Pathway During Supramaximal Effort, but Does Not Improve Anaerobic Capacity or Performance

Autor(es)

Bonetti de Poli, Rodrigo de Araujo ^{[1, 2]} ; Roncada, Luan Henrique ^{[1, 3]} ; Malta, Elvis de Souza ^{[1, 2]} ; Artioli, Guilherme Giannini ^{[4, 5]} ; Bertuzzi, Romulo ^[4] ; Zagatto, Alessandro Moura ^{[1, 2, 3]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Lab Physiol & Sport Performance LAFIDE, Bauru - Brazil

^[2] Sao Paulo State Univ UNESP, Postgrad Program Movement Sci, Bauru - Brazil

^[3] Sao Paulo State Univ UNESP, Dept Phys Educ, Sch Sci, Bauru - Brazil

^[4] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo - Brazil

^[5] Univ Sao Paulo, Appl Physiol & Nutr Res Grp, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN PHYSIOLOGY; v. 10, APR 10 2019.
• Citações Web of Science: 0

Resumo

This study aimed to investigate the effects of short-duration creatine monohydrate supplementation on anaerobic capacity (AC), anaerobic energy pathways, and timeto-exhaustion during high-intensity running. Fourteen healthy men underwent a graded exercise test (GXT) followed by a (V)overdotO(2max) confirmation test, 5 submaximal efforts, and 4 supramaximal running bouts at 115% of (V)overdotO(2max) intensity (the first two supramaximal sessions were applied as familiarization trials) to measure the AC using two procedures; the maximum accumulated oxygen deficit (MAOD) and non-oxidative pathways energetics sum (AC({[}La)(-])(+EPOCfast)). The investigation was conducted in a single-blind and placebo-controlled manner, with participants performing the efforts first after being supplemented with a placebo (dextrose 20 g.day(-1) for 5 days), and then, after a 7 day ``placebo{''} washout period, they started the same procedure under creatine supplementation (20 g.day(-1) for 5 days. This order was chosen due to the prolonged washout of creatine. MAOD was not different between placebo (3.35 +/- 0.65 L) and creatine conditions (3.39 +/- 0.79 L; P = 0.58) and presented a negligible effect {[}effect size (ES) = 0.08], similar to, AC({[}La)(-])(+EPOCfast) (placebo condition (3.66 +/- 0.79 Land under creatine ingestion 3.82 +/- 0.85 L; P = 0.07) presenting a small effect (ES = 0.20). The energetics from the phosphagen pathway increased significantly after creatine supplementation (1.66 +/- 0.40 L) compared to the placebo condition (1.55 +/- 0.42 L; P = 0.03). However, the glycolytic and oxidative pathways were not different between conditions. Furthermore, time to exhaustion did not differ between placebo (160.79 +/- 37.76 s) and creatine conditions (163.64 +/- 38.72; P = 0.49). Therefore, we can conclude that creatine supplementation improves the phosphagen energy contribution, but with no statistical effect on AC or time to exhaustion in supramaximal running. (AU)

• Processo FAPESP: 17/21724-8 - Impacto do uso regular de imersão em água fria após sessões de treinamento intervalado de alta intensidade sobre o reparo tecidual, adaptação muscular e desempenho em corrida
• Beneficiário: Elvis de Souza Malta
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/17836-2 - Efeitos da pós ativação neuromuscular induzida por saltos na capacidade anaeróbia em cicloergômetro
• Beneficiário: Rodrigo de Araujo Bonetti de Poli
• Modalidade de apoio: Bolsas no Brasil - Mestrado