Does caffeine ingestion before a short-term sprint interval training promote body fat loss?

Abstract

We investigated the effect of caffeine ingestion combined with a 2-wk sprint interval training (SIT) on training-induced reductions in body adiposity. Twenty physically-active men ingested either 5 mg/kg of cellulose as a placebo (PLA, n=10) or 5 mg/kg of caffeine (CAF, n=10) 60 min before each SIT session (13 30 s sprint/15 s of rest). Body mass and skinfold thickness were measured pre-and post-training. Energy expenditure was measured at rest, during exercise, and 45 min after exercise in the first SIT session. Body fat was similar between PLA and CAF groups at pre-training (P40.05). However, there was a significant decrease in body fat after training in the CAF group (–5.9±4.2%, Po0.05) but not in PLA (1.5±8.0%, P40.05). There was no difference in energy expenditure at rest and during exercise between PLA and CAF groups (P40.05), but the post-exercise energy expenditure was 18.3±21.4% greater in the CAF than in the PLA group (Po0.05). In conclusion, caffeine ingestion before SIT sessions induced a body fat loss that may be associated with higher post-exercise energy expenditure.