Dispelling the myth that habitual caffeine consumption influences the performance response to acute caffeine supplementation

Gonçalves, LS, Painelli, VS, Yamaguchi, G, de Oliveira, LF, Saunders, B, da Silva, RP, Maciel, E, Artioli, GG ORCID: https://orcid.org/0000-0001-8463-2213, Roschel, H and Gualano, B, 2017. Dispelling the myth that habitual caffeine consumption influences the performance response to acute caffeine supplementation. Journal of Applied Physiology, 123 (1), pp. 213-220. ISSN 8750-7587

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Abstract

Objective:
To investigate the influence of habitual caffeine intake on aerobic exercise performance responses to acute caffeine supplementation.
Methods:
A double-blind, crossover, counterbalanced study was performed. Forty male endurance-trained cyclists were allocated into tertiles according to their daily caffeine intake: low (58 ± 29 mg.d-1), moderate (143 ± 25 mg.d-1), and high consumers (351 ± 139 mg.d-1). Participants completed three trials in which they performed simulated cycling time-trials in the fastest time possible following
ingestion of: caffeine (CAF: 6 mg.kg-1 BM), placebo (PLA), and no supplement (CON).
Results:
Mixed-model analysis revealed time-trial performance was significantly improved in CAF compared to PLA and CON
(29.92±2.18 min vs 30.81±2.67 and 31.14±2.71 min; P = <0.0002). ANCOVA revealed no influence of habitual caffeine intake as a covariate on exercise performance (P=0.47). Time-trial performance was not significantly different between tertiles (P=0.75). No correlation was observed between habitual caffeine intake and absolute changes (CAF – CON) in time-trial performance with caffeine (P=0.524). Individual analysis showed that eight, seven and five individuals improved above the variation of the test in CAF in the low, moderate and high tertiles, respectively. A Fisher's Exact Test did not show any significant differences in the number of individuals who improved in CAF between the tertiles (P>0.05). Blood lactate and ratings of
perceived exertion were not different between trials and tertiles (P>0.05).
Conclusion:
Performance effects of acute caffeine supplementation during a ~30 min cycling TT performance were not influenced by the level of habitual caffeine consumption.

Item Type:	Journal article
Alternative Title:	Habitual caffeine intake and performance [running head]
Publication Title:	Journal of Applied Physiology
Creators:	Gonçalves, L.S., Painelli, V.S., Yamaguchi, G., de Oliveira, L.F., Saunders, B., da Silva, R.P., Maciel, E., Artioli, G.G., Roschel, H. and Gualano, B.
Publisher:	American Physiological Society
Date:	1 July 2017
Volume:	123
Number:	1
ISSN:	8750-7587
Identifiers:	Number Type 10.1152/japplphysiol.00260.2017 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	16 May 2017 13:24
Last Modified:	31 May 2021 15:14
URI:	https://irep.ntu.ac.uk/id/eprint/30677

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