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Article

Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers

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Laboratorio de Biomecánica Deportiva, Departamento de Salud y Rendimiento Humano, Facultad de Ciencias de la Actividad Física y del Deporte, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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School of Physiotherapy, Faculty of Health Sciences, Francisco de Vitoria University, 28223 Madrid, Spain
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Faculty of Health Sciences, Alfonso X El Sabio University, 28691 Villanueva de la Cañada (Madrid), Spain
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Department of Systems Biology, University of Alcalá, 28805 Madrid, Spain
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Departamento de Nutrición Humana y Dietética, Facultad de Ciencias de la Salud, Universidad Alfonso X El Sabio, 28691 Villanueva de la Cañada (Madrid), Spain
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Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Alcalá, 28805 Madrid, Spain
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Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain
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Author to whom correspondence should be addressed.
Nutrients 2019, 11(9), 2120; https://doi.org/10.3390/nu11092120
Received: 19 August 2019 / Revised: 29 August 2019 / Accepted: 30 August 2019 / Published: 5 September 2019
(This article belongs to the Special Issue Coffee and Caffeine Consumption for Human Health)
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−1) 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; Effect 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 the Wingate test, improved jump height in the CMJ (+2.4 cm, p < 0.01), and improved neuromuscular efficiency 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 affecting EMG activity and fatigue levels in the lower limbs. Further benefits observed were enhanced neuromuscular efficiency in some muscles and improved reaction speed. View Full-Text
Keywords: anaerobic; caffeine; CMJ; ergogenic aids; exercise; nutrition; sport supplement; Wingate; electromyography; efficiency anaerobic; caffeine; CMJ; ergogenic aids; exercise; nutrition; sport supplement; Wingate; electromyography; efficiency
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MDPI and ACS Style

San Juan, A.F.; López-Samanes, Á.; Jodra, P.; Valenzuela, P.L.; Rueda, J.; Veiga-Herreros, P.; Pérez-López, A.; Domínguez, R. Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers. Nutrients 2019, 11, 2120. https://doi.org/10.3390/nu11092120

AMA Style

San Juan AF, López-Samanes Á, Jodra P, Valenzuela PL, Rueda J, Veiga-Herreros P, Pérez-López A, Domínguez R. Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers. Nutrients. 2019; 11(9):2120. https://doi.org/10.3390/nu11092120

Chicago/Turabian Style

San Juan, Alejandro F., Álvaro López-Samanes, Pablo Jodra, Pedro L. Valenzuela, Javier Rueda, Pablo Veiga-Herreros, Alberto Pérez-López, and Raúl Domínguez. 2019. "Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers" Nutrients 11, no. 9: 2120. https://doi.org/10.3390/nu11092120

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