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European Journal of Applied Physiology

, Volume 116, Issue 11–12, pp 2293–2303 | Cite as

Effects of caffeine ingestion on endurance performance in mentally fatigued individuals

  • Rafael Azevedo
  • Marcos David Silva-Cavalcante
  • Bruno Gualano
  • Adriano E. Lima-Silva
  • Romulo BertuzziEmail author
Original Article

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 (\( \dot{V}{\text{O}}_{2} \)), 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

Mental fatigue Endurance capacity Caffeine ingestion Mood state 

Abbreviations

AX-CPT

AX continuous performance task

C

Control group

CNS

Central nervous system

EMG

Eletromiography

iEMG

Integrated eletromiography

MVC

Maximal voluntary contraction

MF

Mental fatigue group

MF-CAF

Mental fatigue plus caffeine ingestion group

MF-PLA

Mental fatigue plus placebo ingestion group

RMS

Root mean square

RPE

Rating of perceptive exertion

POMS

Profile of mood state questionnaire

VL

Lateral vastus

VO2max

Maximal oxygen uptake

Wmax

Maximal power output

Notes

Compliance with ethical standards

Conflict of interest

None.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Rafael Azevedo
    • 1
  • Marcos David Silva-Cavalcante
    • 1
    • 2
  • Bruno Gualano
    • 3
    • 4
  • Adriano E. Lima-Silva
    • 2
  • Romulo Bertuzzi
    • 1
    Email author
  1. 1.Endurance Performance Research Group, Departamento de Esporte, School of Physical Education and Sport (GEDAE-USP)University of São PauloSão PauloBrazil
  2. 2.Sports Science Research Group, Academic Center of VitoriaFederal University of PernambucoRecifeBrazil
  3. 3.School of Physical Education and SportUniversity of São PauloSão PauloBrazil
  4. 4.Rheumatology Department, School of MedicineUniversity of Sao PauloSão PauloBrazil

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