Abstract
Various choline-based multi-ingredient supplementations (CMS) have been suggested in the current market, but the research is limited. The purpose of this study was to investigate the acute effect of a CMS on physical performance. Fourteen male college football players (20.4 ± 1.0 years) participated in a randomized double-blind crossover experiment separated by 7 days. Subjects were given a CMS or a placebo 60 min before physical performance testing measures, including maximum vertical jumps, maximum voluntary isometric contractions (MVIC), maximal voluntary concentric contractions (MVCC), and fatiguing contractions. Four MVICs and seven sets of two MVCCs at various loads (1 N·m to 60% MVIC torque) were performed with the knee extensor muscles while seated on a dynamometer before and after the fatiguing tasks. During the fatiguing tasks, 120 MVCCs (4 sets × 30 reps) were performed with a load equivalent to 20% MVIC. Twitch interpolation technique was used to assess muscle contractile properties and voluntary activation. No significant differences were seen at baseline between sessions for all testing measures including vertical jump height, strength, power, muscle contractile properties and voluntary activation. Rate of torque development and impulse was higher in supplemental session compared to control session throughout the fatiguing contractions (p = 0.018, p < 0.001, respectively). Acute CMS can improve explosive strength by delaying the onset of fatigue.
Highlights
Maximum vertical jump showed no significant difference in jump height between control and supplemental sessions (70.8 ± 6.6 vs. 70.9 ± 6.2 cm, t13 = 0.135, p = 0.895)
EMG activity of the RF during 0-25 ms of maximum voluntary isometric contractions (MVIC) contractions after the first 30 fatiguing contractions was significantly greater in supplementary session than control session (8.4 ± 3.5 vs. 10.4 ± 3.1% of MVIC, t13 = 1.135, p = 0.029, Cohen’s d = 0.605)
The main findings of this study were that 1) acute supplementation showed no improvements in MVIC strength, rate of torque development (RTD), power, and jump height at baseline; 2) acute supplementation delayed the onset of fatigue for RTD and impulse; 3) The decreased fatigability of static explosive force production (RTD and impulse) could be explained by the increased muscle activity
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Athletes are required to produce a great amount of force and produce that force at a high rate in order to perform a variety of skills including sprinting, jumping, and changing of direction. Many athletes consider supplementation as a means of gaining a physical edge on their competition [1] with the highly competitive culture in today’s athletics. The prevalence of use of sports supplements has rapidly increased over the last decade. The prevalence rate was 82.2% of young athletes in young athletes from 4 countries in 18 sports at the international level [2]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call