The Effects of Nitrate-Rich Supplementation on Neuromuscular Efficiency during Heavy Resistance Exercise
| Autor: | William J. Kraemer, Mark J. S. Miller, David P. Looney, Jeff S. Volek, Lindsay A. Ellis, William H. DuPont, Shawn D. Flanagan, Tunde K. Szivak, Carl M. Maresh, Brent C. Creighton, David R. Hooper, Luke Pryor, Adam J. Sterczala |
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| Rok vydání: | 2016 |
| Předmět: |
Male
Recruitment Neurophysiological medicine.medical_specialty Gross motor skill Medicine (miscellaneous) Squat Isometric exercise Sports nutrition Plant Roots Young Adult 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Animal science Double-Blind Method Nitrate Crossover experiment Heart rate medicine Humans Exercise Nitrates Nutrition and Dietetics Washout 030229 sport sciences chemistry Dietary Supplements Physical therapy Beta vulgaris 030217 neurology & neurosurgery |
| Zdroj: | Journal of the American College of Nutrition. 35:100-107 |
| ISSN: | 1541-1087 0731-5724 |
| Popis: | Nitrate-rich (NR) supplements can enhance exercise performance by improving neuromuscular function and the aerobic cost of exercise. However, little is known about the effects of nitrate on dynamic, multijoint resistance exercise.Fourteen resistance-trained men (age, 21.1 ± 0.9 years; height, 173.2 ± 2.9 cm: body mass, 77.6 ± 4.3 kg; squat one-repetition maximum [1RM], 127.5 ± 18.8 kg) participated in a randomized, double-blind, crossover experiment. Subjects consumed an NR or nitrate-poor (NP) supplement for 3 days, performed a bout of heavy resistance exercise, completed a washout, and then repeated the procedures with the remaining supplement. Before, during, and after exercise, individual and gross motor unit efficiency was assessed during isometric and dynamic muscle contractions. In addition, we compared physical performance, heart rate, lactate, and oxygen consumption (VO2).Nitrate-rich supplementation resulted in lower initial muscle firing rates at rest and lower mean and maximum firing rates over the course of fatiguing exercise. Nitrate-poor supplementation was accompanied by increased mean and maximum firing rates by the end of exercise and lower initial firing rates. In addition, NR supplementation resulted in higher mean peak electromyography (EMG) amplitudes. Heart rate, lactate, and physical performance did not differ by treatment, but oxygen consumption increased more frequently when the NP supplement was consumed.Supplementation with an NR beetroot extract-based supplement provided neuromuscular advantages during metabolically taxing resistance exercise. |
| Databáze: | OpenAIRE |
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