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.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Azevedo R,Silva-Cavalcante MD,Gualano B,Lima-Silva AE,Bertuzzi Rdoi
10.1007/s00421-016-3483-ysubject
Has Abstractpub_date
2016-12-01 00:00:00pages
2293-2303issue
11-12eissn
1439-6319issn
1439-6327pii
10.1007/s00421-016-3483-yjournal_volume
116pub_type
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