Caffeine increases motor output entropy and performance in 4 km cycling time trial

Autor(es)

Viana, Bruno Ferreira ^{[1, 2, 3]} ; Trajano, Gabriel S. ^{[4, 5]} ; Ugrinowitsch, Carlos ^[6] ; Pires, Flavio Oliveira ^[3]

Afiliação do(s) autor(es)

^[1] Augusto Motta Univ Ctr UNISUAM, Phys Educ Course, Rio De Janeiro, RJ - Brazil

^[2] Estacio Sa Univ UNESA, Phys Educ Course, Rio De Janeiro, RJ - Brazil

^[3] Univ Sao Paulo, Sch Arts Sci & Humanities, Exercise Psychophysiol Res Grp, Sao Paulo, SP - Brazil

^[4] Queensland Univ Technol, Sch Exercise & Nutr Sci, Kelvin Grove, Qld - Australia

^[5] Queensland Univ Technol, Inst Hlth & Biomed Innovat, Kelvin Grove, Qld - Australia

^[6] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 15, n. 8 AUG 13 2020.
• Citações Web of Science: 0

Resumo

Caffeine improves cycling time trial performance through enhanced motor output and muscle recruitment. However, it is unknown if caffeine further increases power output entropy. To investigate the effects of caffeine effects on cycling time trial performance and motor output entropy (MOEn), nine cyclists (VO(2MAX)of 55 +/- 6.1 mL(.)kg(.-1)min(-1)) performed a 4 km cycling time trial (TT4km) after caffeine and placebo ingestion in a counterbalanced order. Power output data were sampled at a 2 Hz frequency, thereafter entropy was estimated on a sliding-window fashion to generate a power output time series. A number of mixed models compared performance and motor output entropy between caffeine and placebo every 25% of the total TT(4km)distance. Caffeine ingestion improved power output by 8% (p = 0.003) and increased MOEn by 7% (p = 0.018). Cyclists adopted a U-shaped pacing strategy after caffeine ingestion. MOEn mirrored power output responses as an inverted U-shape MOEn during the time trial. Accordingly, a strong inverse correlation was observed between MOEn and power output responses over the last 25% of the TT4km(p < 0.001), regardless of the ingestion, likely reflecting the end spurt during this period (p = 0.016). Caffeine ingestion improved TT(4km)performance and motor output responses likely due to a greater power output entropy. (AU)

• Processo FAPESP: 16/16496-3 - Efeitos do bochecho de carboidrato sobre o desempenho físico e respostas psicofisiológicas de indivíduos mentalmente fadigados durante teste de VO2MÁX
• Beneficiário: Flávio de Oliveira Pires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/01317-0 - Reserva neurofisiológica: efeitos centrais e periféricos da suplementação de cafeína
• Beneficiário: Flávio de Oliveira Pires
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado