SciELO - Scientific Electronic Library Online

vol.26 número2Body composition and habitual and match-day dietary intake of the FNB Maties Varsity Cup rugby playersAssociations of objectively and subjectively measured physical activity with trabecular and cortical bone properties in prepubertal children índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


South African Journal of Sports Medicine

versão On-line ISSN 2078-516X
versão impressa ISSN 1015-5163


ZHANG, Y et al. Effect of caffeine ingestion on fluid balance during exercise in the heat and during recovery. SA J. Sports Med. [online]. 2014, vol.26, n.2, pp.43-47. ISSN 2078-516X.

BACKGROUND: The effect of ingestion of a common stimulant, caffeine, on fluid balance during exercise and recovery is not fully known. OBJECTIVES: To determine the effect of caffeine on fluid balance during exercise in the heat and during a 3-hour recovery period thereafter. METHODS: In a randomised, controlled design, caffeine-naive participants (N=8) pedalled on a bike to achieve 2.5% baseline body mass loss in a hot environment in four separate conditions: with (C+) or without (C-) caffeine ingestion (6 mg/kg of body mass) prior to exercise, followed by (W+) or without (W-) 100% fluid replenishment (water) of the body mass loss during a 3-hour recovery period (yielding C+W+, C+W-, C-W+ and C-W-, respectively). RESULTS: Mean (standard deviation) urine production was not different (p>0.05) regardless of rehydration status: 230 (162) mL (C+W-) v. 168 (77) mL (C-W-); and 713 (201) mL (C+W+) v. 634 (185) mL (C-W+). For the 3-hour recovery, caffeine ingestion caused higher hypohydration during rehydration conditions (p=0.02), but practically the mean difference in the loss of body mass was only 0.2 kg. CONCLUSION: In practical terms, there was no evidence that caffeine ingestion in moderation would impair fluid balance during prolonged exercise in the heat or during 3 hours of recovery.

        · texto em Inglês     · Inglês ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons