Caffeine Attenuates Decreases in Leg Power Without Increased Muscle Damage

Abstract

Ribeiro, BG, Morales, AP, Sampaio-Jorge, F, Barth, T, de Oliveira, MBC, Coelho, GMdO, and Leite, TC. Caffeine attenuates decreases in leg power without increased muscle damage. J Strength Cond Res 30(8): 2354-2360, 2016-Caffeine ingestion has been shown to be an effective ergogenic aid in several sports. Caffeine administration may increase exercise capacity, which could lead to a greater degree of muscle damage after exercise. This was a randomized, double-blind, placebo-controlled crossover study. Six male handball athletes ingested placebo (PLA) or caffeine (CAF) (6 mg·kg body mass) capsules on 2 different occasions. Sixty minutes after ingestion of the capsules, serum CAF levels were evaluated. Thereafter, all participants performed a protocol of vertical jumps (VJs). The protocol consisted of 4 sets of 30 seconds of continuous VJs with 60 seconds of recovery between sets. Blood lactate (LAC) and creatine kinase (CK) levels were determined before and after the protocol. We found significant differences in serum CAF levels between PLA (0.09 ± 0.18 µg·ml) vs. CAF (6.59 ± 4.44 µg·ml) (p < 0.001). Caffeine elicited a 5.23% (p ≤ 0.05) improvement in the leg power compared with PLA. The CAF trial displayed higher LAC (p ≤ 0.05) compared with PLA (6.26 ± 2.01 vs. 4.39 ± 2.42 mmol·L, respectively) after protocol of VJs, whereas no difference in CK was observed between trials (p > 0.05). These results indicate that immediate ingestion of CAF (6 mg·kg body weight) can reduce the level of muscle fatigue and preserve leg power during the test, possibly resulting in increase in LAC. There was no increase in muscle damage, which indicates that immediate administration of (6 mg·kg body weight) CAF is safe. Thus, nutritional interventions with CAF could help athletes withstand a greater physiological overload during high-intensity training sessions. The results of this study would be applicable to sports and activities that require repetitive leg power.

Caffeine Supplementation for 4 Days Does Not Induce Tolerance to the Ergogenic Effects Promoted by Acute Intake on Physiological, Metabolic, and Performance Parameters of Cyclists: A Randomized, Double-Blind, Crossover, Placebo-Controlled Study

“…The resultant plasma and serum were stored at −20 °C until the analyses could be performed. The caffeine blood levels were determined using a HPLC method, adapted from Ribeiro et al [ 2 ]. The HPLC analyses were carried out using a Shimadzu chromatograph (Shimadzu ® Corp., Kyoto, Japan).…”

“…In an attempt to establish the proper protocol to induce ergogenicity, researchers have examined different strategies, including the source of caffeine to be used [ 5 ], the dose used [ 2 , 3 ], and the acute time of ingestion [ 6 ]. Among these strategies, acute caffeine intake before exercise has been studied more closely by researchers [ 7 , 8 , 9 , 10 , 11 ].…”

Effects of Caffeine Ingestion on Physical Performance in Elite Women Handball Players: A Randomized, Controlled Study

“…5,6 Given the explosive demands that characterize handball competition, identification of nutritional aids that might contribute to the improvement of physical performance during training or matches could be an interesting strategy to be adopted by elite handball players. 7 However, despite the popularity of handball, the information about nutritional strategies to increase handball performance is scarce, in particular caffeine (CAFF). In fact, only one investigation has determined the effects of acute CAFF intake on handball performance 7 despite the fact that the postmatch urinary concentrations of elite handball players suggest a common use of this substance in competition.…”

A Ingestão Aguda De Cafeína Não Suprime O Declínio Das Repetições Máximas E Da Velocidade Média No Exercício De Força

“…Diante dessas dificuldades, muitos pesquisadores reportam ao entendimento dos mecanismos clássicos já bem descritos na literatura; como aumento da atividade da ATPase Na + /K + da musculatura esquelética inativa, levando ao aumento da captação de K + e ao efluxo do Na + (LINDINGER & GRAHAM, 1993), bloqueador competitivo dos receptores de adenosina A 1 e/ou A 2a (DAVIS et al, 2009) e aumento da disponibilidade de nutrientes (i.e., cafeína e glicose) através da alteração do tempo no esvaziamento gástrico ( VAN NIEUWENHOVEN et al, 2000). O tempo de absorção proposto (60 minutos) pelo presente estudo foi baseado na pesquisa realizada pelo nosso grupo (RIBEIRO et al, 2016) onde foi verificado em jogadores de handebol níveis séricos de cafeína de 6.59±4.44 µg/mL, valores de pico semelhantes ao encontrado em ciclistas (̴ 7.3 µg/mL) (CONWAY et al, 2003) e atletas recreacionais (11.29 µg/mL) ( VAN SOEREN & GRAHAM, 1998), todos utilizando 6 mg de cafeína por quilograma de peso corporal.…”

“…Foram utilizados intervalos de 3 minutos entre as séries. Foram utilizadas cápsulas idênticas contendo 6 mg de cafeína por quilograma de peso corporal ou placebo (150 mg de sulfato cálcio), manipuladas por um farmacêutico e fornecidas aos participantes para serem ingeridas 1h antes do teste (RIBEIRO et al 2016). A ordem de tratamento (CAF ou PLA) foi sorteada entre os participantes.…”