The Effects of Habitual Caffeine Intake on Lean Body Mass and Strength Performance During 12Weeks of Resistance Exercise Training
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Caffeine ingestion has been shown to potentially improve training and performance in endurance exercise. The effects of caffeine on resistance exercise training (RET) have not been thoroughly explored; however, it has been hypothesized that caffeine can limit muscle growth and recovery postRET. Determining whether habitual caffeine use would limit benefits (increased lean mass and strength) associated with RET would be important to those who are currently training. 58 healthy, untrained individuals (Men: 24; Women: 34; Age: 643y) underwent 12 weeks of wholebody RET (8 exercises, 3dwk1, 3 sets 812 reps, 75% of onerepetition maximum (1RM)). Three caffeine groups were created based on habitual consumption: low (L) (<150mg/kg/day), medium (M) (151300mg/kg/day), and high (H) (>300mg/kg/day). Body composition (DEXA) and 1RM were measured before and after training. No difference in percent change in weight lifted (Leg Press: L, (67.0354.97; M, 57.0444.09; H, 51.5755.17; Chest Press: L, 44.1455.97; M, 32.9614.64; H, 25.8923.70; p>0.05), and percent change in lean mass were found between the groups (L, 2.273.55; M, 1.553.21; H, 2.392.59; p>0.05). Our data suggests that there were no negative effects from a wide range of habitual caffeine intakes on muscle response to RET. These results do not predict the effects of a single dose of caffeine on RET responses in an individual unaccustomed to caffeine.
