Sports Medicine Commons^™

Acute Effect Of High‑Definition And Conventional Tdcs On Exercise Performance And Psychophysiological Responses In Endurance Athletes: A Randomized Controlled Trial, Daniel Gomes Da Silva Machado, Marom Bikson, Abhishek Datta, Egas Caparelli‑Dáquer, Gozde Unal, Abrahão F. Baptista, Edilson Serpeloni Cyrino, Li Min Li, Edgard Morya, Alexandre Moreira, Alexandre Hideki Okano

Publications and Research

Transcranial direct current stimulation (tDCS) has been used aiming to boost exercise performance and inconsistent findings have been reported. One possible explanation is related to the limitations of the so-called “conventional” tDCS, which uses large rectangular electrodes, resulting in a diffuse electric field. A new tDCS technique called high-definition tDCS (HD-tDCS) has been recently developed. HD-tDCS uses small ring electrodes and produces improved focality and greater magnitude of its aftereffects. This study tested whether HD-tDCS would improve exercise performance to a greater extent than conventional tDCS. Twelve endurance athletes (29.4 ± 7.3 years; 60.15 ± 5.09 ml kg− 1 min− …

Using Carrots Not Sticks To Cultivate A Culture Of Safeguarding In Sport, Judith L. Komaki, Yetsa A. Tuakli-Wosornu

Publications and Research

The power-driven, win-at-all-costs milieu of many sport settings can create fertile ground for athlete victimization and abuse (Roberts et al., 2020). Victory can in fact be so sovereign that abusive coaches and staff are enabled and “even rewarded. . . in the name of winning” (Armour, 2020). Athlete abuse prevention therefore requires systemic cultural change (Letourneau et al., 2014; Rhind and Owusu-Sekyere, 2017). Thus far, however, enacting this idea has eluded organizations in sport (Mountjoy et al., 2016; Harris and Terry, 2019; Kerr et al., 2019; Rhind and Owusu-Sekyere, 2020) as well as in other settings (National Academies of Sciences, …

Resistance Exercise Intensity Does Not Influence Neurotrophic Factors Response In Equated Volume Schemes, Leandro Lodo, Alexandre Moreira, Reury Frank P Bacurau, Carol D. Capitani, Wesley P. Barbosa, Marcelo Massa, Brad J. Schoenfeld, Marcelo S. Aoki

Publications and Research

The aim of the present study was to evaluate the effects of 2 different intensities of resistance training (RT) bouts, performed with the equated total load lifted (TLL), on the acute responses of neurotrophic factors (NFs) (brain-derived neurotrophic factor [BDNF]; and nerve growth factor [NGF]), as well as on metabolic (lactate concentration) and hormonal (salivary cortisol concentration) responses. Thirty participants (males, 22.8 ± 2.3 years old, 177 ± 6.8 cm, 75.5 ± 7.9 kg, n = 15; and females, 22.2 ± 1.7 years, 163.7 ± 6.5 cm, 57 ± 7.6 kg, n = 15) performed 2 separate acute RT bouts …

Test–Retest Reliability Of The One- Repetition Maximum (1rm) Strength Assessment: A Systematic Review, Jozo Grgic, Bruno Lazinica, Brad J. Schoenfeld, Zeljko Pedisic

Publications and Research

Background: The test–retest reliability of the one-repetition maximum (1RM) test varies across different studies. Given the inconsistent findings, it is unclear what the true reliability of the 1RM test is, and to what extent it is affected by measurement-related factors, such as exercise selection for the test, the number of familiarization trials and resistance training experience.

Objectives: The aim of this paper was to review studies that investigated the reliability of the 1RM test of muscular strength and summarize their findings.

Methods: The PRISMA guidelines were followed for this systematic review. Searches for studies were conducted through eight databases. Studies …

Comparison Of Blood Lactate And Perceived Exertion Responses In Two Matched Time-Under- Tension Protocols, Salvador Vargas-Molina, Fernando Martín-Rivera, Diego A. Bonilla, Jorge L. Petro, Leandro Carbone, Ramón Romance, Manuel Dediego, Brad J. Schoenfeld, Javier Benítez-Porres

Publications and Research

Purpose: The aim of this study was to compare the concentration of blood lactate [bLa-] and the subjective perception of exertion of trained men in a moderate repetition protocol (MRP) versus a high repetition protocol (HRP) equated for time under tension.

Methods: A sample of 40 healthy young men (aged, 23.2 ± 4.0 years; height, 177.3 ± 7.0 cm; BMI, 24.3 ± 2.2) performed two sessions of 8 sets of bicep curls with a one-week recovery interval between the trials. In the HRP protocol, 20 repetitions were performed with a cadence of 2 seconds of eccentric and 1 …

Caffeine Ingestion Enhances Repetition Velocity In Resistance Exercise: A Randomized, Crossover, Double-Blind Study Involving Control And Placebo Conditions, Jozo Grgic, Sandro Venier, Brad J. Schoenfeld, Pavle Mikulic

Publications and Research

We aimed to examine the effects of placebo and caffeine compared to a control condition on mean velocity in the bench press exercise. Twenty-five resistance-trained men participated in this randomized, crossover, double-blind study. The participants performed the bench press with loads of 50%, 75%, and 90% of one-repetition maximum (1RM), after no supplementation (i.e., control), and after ingesting caffeine (6 mg/kg), and placebo (6 mg/kg of dextrose). At 50% 1RM, there was a significant effect of caffeine on mean velocity compared to control (effect size [ES] = 0.29; p = 0.003), but not when compared to placebo (ES = 0.09; …