Effect of New Zealand Blackcurrant Extract on Isometric Contraction-Induced Fatigue and Recovery: Potential Muscle-Fiber Specific Effects
| Autor: | Ian Perkins, Megan Bradley, Mark E. T. Willems, Sam D. Blacker |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physical Therapy
Sports Therapy and Rehabilitation Isometric exercise 030204 cardiovascular system & hematology Article RC1200 lcsh:GV557-1198.995 03 medical and health sciences recovery 0302 clinical medicine Animal science Medicine Orthopedics and Sports Medicine Increased fatigue Muscle fibre Twitch force lcsh:Sports Muscle fatigue business.industry Work (physics) 030229 sport sciences twitch force QP Crossover study anthocyanins sports nutrition Quartile muscle force muscle fatigue business blackcurrant |
| Zdroj: | Sports Sports, Vol 8, Iss 135, p 135 (2020) Volume 8 Issue 10 |
| ISSN: | 2075-4663 |
| Popis: | New Zealand blackcurrant (NZBC) extract has shown performance-enhancing effects during cycling, running and sport climbing. We examined effects of NZBC extract on (1) voluntary and twitch force of the quadriceps femoris muscles during repeated isometric contraction-induced fatigue, (2) twitch force during recovery and (3) muscle fiber-specific effects. Familiarized recreationally active males (n = 12, age: 24 ± 5 yrs height: 180 ± 5 cm body mass: 89 ± 11 kg) performed sixteen, 5-s voluntary maximal isometric contractions (iMVC) separated by 3-s rest. Twitch force was recorded before, during the 3-s rests and 5-min recovery. Supplementation consisted of 7-days intake of NZBC extract (600 mg∙day&minus 1 containing 210 mg anthocyanin) in a double-blind, randomized, placebo-controlled crossover design with a 14-days washout. NZBC extract allowed for greater force in the first quartile of the iMVCs. Twitch force at baseline was 12% higher with NZBC extract (p = 0.05). However, there was no effect of NZBC for twitch force during the 16-iMVCs and recovery. Based on the maximum post-activation potentiation during the placebo 16-iMVCs, four subjects were classified of having a predominant type I or II muscle fiber typology. In type II, NZBC extract provided a trend for increased MVC force (~14%) in the first quartile and for type I in the fourth quartile (~10%). In type I, NZBC extract seemed to have higher twitch forces during the fatiguing exercise protocol and recovery, indicating increased fatigue resistance. New Zealand blackcurrant extract affects force during repeated maximal isometric contractions. Future work on mechanisms by NZBC extract for muscle fiber-specific fatigue-induced force responses is warranted. |
| Databáze: | OpenAIRE |
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