Effect Of Nitrate Supplementation On Motor Unit Functions In Healthy Active Adults

Nitrate (NO3-) supplementation may enhance fatigue resistance and recovery, possibly because its additive effect on muscle blood flow (BF) during contraction. During submaximal contractions, there are numerous ways in which the decrease performance can be compensated for, such as motor unit (MU) recruitment, or increasing firing rate (MUFR). Given that changes BF correlates with MUFR, increased via NO3- MUFR recovery. PROPOSE: to investigate of MU Functions a sustained isometric contraction where was occluded healthy active adults. METHODS: In counterbalanced double-blinded manner, 14 young adults completed two 5-day supplement period either NO3--rich (NIT) NO3--depleted (PLA) beetroot juice. Each trial consisted measuring knee-extension forces, jiggle were measured an intramuscular concentric needle. After initial 20 sec at 25% maximal voluntary (MVC) unfatigued state (UF), leg for 5 min then participants held MVC 3 recording iEMG throughout, final taken value (F). Participants rested, but still occluded, performed 45 post-fatigue (R1). Occlusion released, after further (R2). Data analysed using two-way repeated measures ANOVA. RESULTS: The plasma NO2- concentration (475 ± 93 nmol·L-1) compared PLA (198 46 nmol·L-1, p < 0.01). decreased remained low recovery periods (UF: 9 0.3 Hz; F: 7.3 R1: 8 0.2 R2: 7.7 Hz, develops, high occlusion, without occlusion 19.7 0.8 %; 23.7 1.4 27.7 2.5 23.3 1.5 %, 0.05). had no placebo any condition (p > CONCLUSION: ergogenic aid development short-period adults, least intensity contractions.