Caffeine increases strength and power performance in resistance‐trained females during early follicular phase

Caffeine ingestion at 4 mg·kg significantly enhanced strength and power in resistance-trained females during the early follicular phase.

• Caffeine improved one-repetition maximum (1RM) squat and bench press by 4.5% and 3.3%, respectively.
• Repetitions to failure (RTF) increased by 15.9% for squat and 9.8% for bench press with caffeine compared to placebo.
• Maximal voluntary contraction torque increased by 4.6%, while countermovement jump height and power improved by 7.6% and 3.8%, respectively.
• No differences were observed in the rate of force development or muscle activation.
• Caffeine levels in plasma significantly rose throughout the protocol, with only mild side effects reported by 3 participants.

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