Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers.
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2019
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Nutrients
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Abstract
Background: this study examined the effects of caffeine supplementation on anaerobic
performance, neuromuscular efficiency and upper and lower extremities fatigue in Olympic-level
boxers. Methods: Eight male athletes, members of the Spanish National Olympic Team, were enrolled
in the study. In a randomized double-blind, placebo-controlled, counterbalanced, crossover design,
the athletes completed 2 test sessions after the intake of caffeine (6 mg kg) or placebo. Sessions
involved initial measures of lactate, handgrip and countermovement jump (CMJ) performance,
followed by a 30-seconds Wingate test, and then final measures of the previous variables. During
the sessions, electromiography (EMG) data were recorded on the gluteus maximus, biceps femoris,
vastus lateralis, gastrocnemius lateral head and tibialis anterior. Results: caffeine enhanced peak
power (6.27%, p < 0.01; E ect Size (ES) = 1.26), mean power (5.21%; p < 0.01; ES = 1.29) and reduced
the time needed to reach peak power (9.91%, p < 0.01; ES = 0.58) in theWingate test, improved jump
height in the CMJ (+2.4 cm, p < 0.01), and improved neuromuscular e ciency at peak power in the
vastus lateralis (ES = 1.01) and gluteus maximus (ES = 0.89), and mean power in the vastus lateralis
(ES = 0.95) and tibialis anterior (ES = 0.83). Conclusions: in these Olympic-level boxers, caffeine
supplementation improved anaerobic performance without a ecting EMG activity and fatigue levels
in the lower limbs. Further benefits observed were enhanced neuromuscular e ciency in some
muscles and improved reaction speed.
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Keywords
Anaerobic, Caffeine, Ergogenic aids, Exercise, Nutrition, Sport supplement, Wingate, Electromyography