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Eur J Appl Physiol. 2016 Sep;116(9):1693-702. doi: 10.1007/s00421-016-3423-x. Epub 2016 Jul 2.

Caffeine ingestion improves power output decrement during 3-min all-out exercise.

Author information

1
Department of Athletic Performance, National Taiwan Normal University, Taipei, Taiwan.
2
Graduate Institute of Sports Training, University of Taipei, Taipei, Taiwan.
3
Department of Physical Education, National Taiwan Normal University, Taipei, Taiwan.
4
Center for General Education, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung, 80424, Taiwan. karenlee1129@gmail.com.

Abstract

PURPOSE:

To investigate the effect of caffeine ingestion on the 3-min all-out test (3MT) performance and plasma electrolytes in athletes.

METHODS:

Fifteen collegiate male basketball players were recruited and completed two trials separated by at least 1 week in caffeine (CAF, 6 mg kg(-1)) and placebo conditions. During the first visit, participants performed an incremental cycling test to determine their 3MT resistance. After a familiarization trial, participants performed a CAF or PL trial according to a randomized crossover design. One hour after ingesting capsules, the participants performed the 3MT to estimate the end-test power (EP) and work done above EP (WEP). Blood samples for sodium (Na(+)), potassium (K(+)), pH, and lactate concentrations were drawn pretest, 1 h after ingestion, and posttest.

RESULTS:

Significant differences in WEP (CAF vs. PL, 13.4 ± 3.0 vs. 12.1 ± 2.7 kJ, P < 0.05) but not in EP (CAF vs. PL, 242 ± 37 vs. 244 ± 42 W, P > 0.05) were determined between the conditions. Compared with the PL condition, the CAF condition yielded significantly higher power outputs (60-150 s), a lower fatigue rate during the 3MT (CAF vs. PL, 0.024 ± 0.007 vs. 0.029 ± 0.006 s(-1), P < 0.05), a significantly higher lactate concentration after the 3MT, and significantly lower K(+) concentrations at 1 h after caffeine ingestion. There were no significant interaction effects for pH and Na(+) concentrations.

CONCLUSIONS:

Caffeine ingestion did not change EP but improved WEP and the rate of decline in power output during short-term, severe exercise.

KEYWORDS:

Anaerobic power; Critical power; Ergogenic aid; Nutritional supplement; Performance; Short-term high-intensity exercise

PMID:
27372742
DOI:
10.1007/s00421-016-3423-x
[Indexed for MEDLINE]

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