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Eur J Appl Physiol. 2016 Dec;116(11-12):2293-2303. Epub 2016 Sep 30.

Effects of caffeine ingestion on endurance performance in mentally fatigued individuals.

Author information

1
Endurance Performance Research Group, Departamento de Esporte, School of Physical Education and Sport (GEDAE-USP), University of São Paulo, Av. Professor Melo de Moraes, 65, Cidade Universitária, São Paulo, SP, 05508-030, Brazil.
2
Sports Science Research Group, Academic Center of Vitoria, Federal University of Pernambuco, Recife, Brazil.
3
School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
4
Rheumatology Department, School of Medicine, University of Sao Paulo, São Paulo, Brazil.
5
Endurance Performance Research Group, Departamento de Esporte, School of Physical Education and Sport (GEDAE-USP), University of São Paulo, Av. Professor Melo de Moraes, 65, Cidade Universitária, São Paulo, SP, 05508-030, Brazil. bertuzzi@usp.br.

Abstract

PURPOSE:

To examine the effects of caffeine ingestion on physiological and perceptual responses in mentally fatigued individuals.

METHODS:

Eight male physically active subjects completed four cycling constant-workload tests in four experimental conditions at 80 % of maximal power output: control (C), mental fatigue (MF), mental fatigue plus caffeine ingestion (5 mg/kg) (MF-CAF), and mental fatigue plus placebo (MF-PLA). The mental fatigue was induced by a continuous performance task A-X version (AX-CPT). Before and after the AX-CPT, the profile of mood state (POMS) and blood samples for lactate measurement were collected. Oxygen consumption ([Formula: see text]), rating of perceived exertion (RPE), and electromyography (EMG) activity were measured during the cycling test.

RESULTS:

The time to exhaustion in C, MF, MF-PLA, and MF-CAF were 251 ± 30, 222 ± 23, 248 ± 28, and 285 ± 42 s, respectively. Delta values (corrected by C condition) were higher in MF-CAF than MF (P = 0.031). MF-CAF reported higher Vigor scores when compared with C (P = 0.046) and MF (P = 0.020). RPE at the first minute was significantly higher in MF-PLA than in C (P = 0.050); at the second minute, RPE was higher in MF-PLA than in C (P = 0.049) and MF-CAF (P = 0.048). EMG activity was not different between the conditions.

CONCLUSIONS:

Caffeine ingestion increased approximately 14 % endurance performance after the induction of mental fatigue. This effect was accompanied by a tendency to improvement in mood state (i.e., vigor). Therefore, caffeine ingestion can promote a beneficial effect on endurance performance in mentally fatigued individuals.

KEYWORDS:

Caffeine ingestion; Endurance capacity; Mental fatigue; Mood state

PMID:
27695980
DOI:
10.1007/s00421-016-3483-y
[Indexed for MEDLINE]

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