Acute Photobiomodulation Does Not Influence Specific High-Intensity and Intermittent Performance in Female Futsal Players.

The acute improvement of performance after photobiomodulation therapy (PBMT) has been reported in different types of exercise. However, the effect on high-intensity and intermittent exercises that are relevant for team sports is unknown. Thus, we evaluated the effect of prior acute application of PBMT on high-intensity and intermittent exercise performance, muscle oxygenation, and physiological/perceptual indicators in amateur female futsal players. Thirteen players (24.1 ± 3.7 years) performed a testing battery (countermovement jump (CMJ), Illinois agility and YoYo intermittent recovery test level 1 (YYIR1)) preceded by 15 min of PBMT (1 min 30 s each muscular point; five muscular points in each lower limbs) or 15 min of placebo (SHAM), in a counterbalanced randomized cross-over design (one-week in-between PBMT/SHAM). All test performance did not differ (p > 0.05) between PBMT and SHAM, as well as blood lactate, rating of perceived exertion, heart rate, and muscle oxygenation (via near infrared spectroscopy) responses. The acute application of PBMT prior to a physical testing battery does not influence high-intensity and intermittent exercises performance, neither physiological nor perceptual responses in amateur female futsal players.

Optimal load for the peak power and maximal strength of the upper body in Brazilian Jiu-Jitsu athletes.

We determined the optimal load for the peak power output (PPO) during the bench press throw (BPT) in Brazilian Jiu-Jitsu (BJJ) athletes and compared the PPO and maximal strength between advanced (AD) and nonadvanced (NA) athletes. Twenty-eight BJJ athletes (24.8 ± 5.7 years) performed the BPT at loads of 30, 40, 50, and 60% of their 1 repetition maximum (RM) in a randomized order (5-minute rest between BPTs). The PPO was determined by measuring the barbell displacement by an accelerometer (Myotest). The absolute (F = 7.25; p < 0.001; effect size [ES] = 0.21) and relative intensities were different (F = 7.11; p < 0.001; ES = 0.21) between the AD and NA. There was also a group and intensity interaction effect (F = 2.79; p = 0.046; ES = 0.10), but the differences were centered around the AD group, which achieved higher values using 40% (p = 0.001) and 50% of the 1RM (p < 0.001) than the PPO with 60% of 1RM. The AD athletes presented with higher 1RM than NA (p ≤ 0.05; ES = 1.0), but there was no difference (p > 0.05) in the PPO (30-60% 1RM). A polynomial adjustment indicated that the optimal load was ∼42% of 1RM for all groups and subgroups (R from 0.82 to 0.99). Our results suggest that there can be (1RM) differences between AD and NA BJJ athletes; however, there is no difference in the muscle power between the AD and NA groups. Additionally, ∼42% of 1RM seems to be the optimal load for developing maximal power using the BPT for the BJJ athletes.

Resposta aguda da pressão arterial, da frequência cardíaca e do duplo-produto após uma sessão de eletroestimulação em exercício de força / Acute response of blood pressure, heart rate and dual output after an electro-stimulation session with strength training exercises

Objetivo: Verificar as respostas cardiovasculares(frequência cardíaca, pressão arterial e duplo-produto)agudas após a utilização da eletroestimulação (EE) prévia aos exercícios de força. Métodos: Foram estudados 16 homens voluntários do sexo masculino (idade 25,7 mais ou menos 6 anos, massa 80 mais ou menos 10,5 kg, estatura 177,1 mais ou menos 7,41 cm) com previa experiência em exercício de força. Os indivíduos foram separados aleatoriamente em dois grupos: Grupo I: Grupo sem eletroestimulação )GSE n igual 8), Grupo 2: Grupo eletroestimulação (GEE n igual 8). Antes da coleta de dados, todos os indivíduos realizaram o teste de 10 repetições máximas (10-RM) no exercício extensão de joelhos simultâneos. Após 48 h do teste 10-RM, foi realizada a coleta de dados, com a execução de 3 séries de 10 repetições, a 80 por cento de 10-RM e intervalo de recuperação de 2 minutos fixos, para ambos os grupos, no exercício cadeira extensora. As mensurações da pressão arterial, da frequência cardíaca e do duplo-produto (PAS X FC) foram realizadas no repouso e ao final da 1, 2 e 3 séries de exercícios. No GEE foi adotada a aplicação da EE prévia à realização do exercício em uma frequência de 50 Hz...