| Full text | |
| Author(s): |
Franco-Alvarenga, Paulo Estevao
[1]
;
Brietzke, Cayque
[1]
;
Canestri, Raul
[1]
;
Goethel, Marcio Fagundes
[1]
;
Hettinga, Florentina
[2]
;
Santos, Tony Meireles
[3]
;
Pires, Flavio Oliveira
[1, 4]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Sch Arts Sci & Humanities, Exercise Psychophysiol Res Grp, Sao Paulo - Brazil
[2] Northumbria Univ, Fac Hlth & Life Sci, Dept Sport Exercise & Rehabil, Newcastle Upon Tyne, Tyne & Wear - England
[3] Univ Fed Pernambuco, Recife, PE - Brazil
[4] Univ Fed Sao Paulo, Human Movement Sci & Rehabil Program, Sao Paulo - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Physiology & Behavior; v. 204, p. 41-48, MAY 15 2019. |
| Web of Science Citations: | 2 |
| Abstract | |
Purpose: To verify whether caffeine (CAF) could increase the prefrontal cortex (PFC) activation and improve 20 km cycling time trial (TT20km) performance in mentally fatigued cyclists. Methods: After preliminary TT20km, twelve recreational cyclists (VO2MAX of 58.9 +/- 6.2 mL kg min(-1)) performed a familiarization with a cognitive test to induce mental fatigue (MF) and psychological scales. Thereafter, they performed: 2) a baseline TT20km; 3) a mentally fatigued TT20km (MF); 4 and 5) a mentally fatigued TT20km after CAF (MF + CAF) or placebo (MF + PLA) ingestion, in a double-blind, counterbalanced design. Performance and psychological responses were obtained throughout the TT20km, while PFC electroencephalography (EEG) theta wave was obtained before and after the mental fatigue test. Results: The mental fatigue-induced increase in EEG theta wave (up arrow similar to 4.8%) was reverted with CAF (down arrow 8.8%) and PLA ingestion (down arrow 4.8%). CAF improved TT20km performance in mentally fatigued cyclists by reducing time (p = .00; down arrow similar to 1.7%) and increasing W-MEAN (p = .00; up arrow similar to 3.6%), when compared to MF + PLA. The RPE-power output ratio was lower (p = .01), but affect (p = .018), motivation (p = .033) and emotional arousal (p = .001) were greater throughout the TT20km in MF + CAF than in MF + PLA. Conclusions: CAF ingestion improved TT20km performance and psychological responses in mentally fatigued cyclists, despite the unaltered PFC activation. (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 |