| Full text | |
| Author(s): |
Viana, Bruno Ferreira
[1, 2, 3]
;
Trajano, Gabriel S.
[4, 5]
;
Ugrinowitsch, Carlos
[6]
;
Pires, Flavio Oliveira
[3]
Total Authors: 4
|
| Affiliation: | [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
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | PLoS One; v. 15, n. 8 AUG 13 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 16/16496-3 - Effects of carbohydrate mouth rinse on physical performance and psychophysiological responses in individuals mentally fatigued during VO2MAX test |
| Grantee: | Flávio de Oliveira Pires |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 10/01317-0 - Neurophysiological reserve: peripheral and central effects of caffeine supplementation |
| Grantee: | Flávio de Oliveira Pires |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |