Effects of enzymatically modified isoquercitrin in supplementary protein powder on athlete body composition: a randomized, placebo-controlled, double-blind trial

Journal of the International Society of Sports Nutrition

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[1] 0000 0000 8801 3092, grid.419972.0, Health Science Research Center, Morinaga & Co., Ltd, Tokyo, Japan;0000 0001 2369 4728, grid.20515.33, Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan;0000 0001 2369 4728, grid.20515.33, Physical Education Graduate School, University of Tsukuba, Tsukuba, Japan;0000 0001 2369 4728, grid.20515.33, Physical Education Graduate School, University of Tsukuba, Tsukuba, Japan;

关键词: Rutin;    Quercetin;    Antioxidant;    Muscle mass;    Weight management;    Resistance training;   

DOI  :  10.1186/s12970-019-0303-x

来源: publisher

【 摘 要 】

BackgroundEnzymatically modified isoquercitrin (EMIQ), a water-soluble quercetin, has been shown to intensify muscle hypertrophy in mice. We investigated the effect of EMIQ in supplementary protein powder on athlete body composition.MethodsForty Japanese males who played American football (age: 19.8 ± 1.4 years; body height: 174.1 ± 6.0 cm; body mass: 75.5 ± 10.7 kg) were assigned to a randomized, placebo-controlled, double-blind trial of parallel group. Participants received either EMIQ in whey protein (EW, n = 19) or contrast whey protein (W, n = 20) 6 days per week over 4 months. Body composition was assessed using dual-energy X-ray absorptiometry. Markers of oxidative stress, derivatives of reactive oxygen metabolites (d-ROMs) and biological antioxidant potential (BAP), were assessed using a free radical analytical system. Data were analyzed using a univariate and repeated measures general model statistics.ResultsAfter 4 months, changes in lower limb fat-free mass and muscle mass were significantly greater in the EW group than in the W group (mean change ±95% CI; W: 324.1 ± 284.3, EW: 950.3 ± 473.2, p = 0.031, W: 255.7 ± 288.6, EW: 930.9 ± 471.5, p = 0.021, respectively). Moreover, the EW group exhibited a significantly higher BAP/d-ROMs ratio, antioxidation index, than the W group after 4 months (mean change ± SD; W: 8.8 ± 1.1, EW: 10.3 ± 2.8; p = 0.028). No significant differences in body mass, lean body mass, fat mass, or lower limb fat mass were observed between the groups.ConclusionIngestion of EMIQ in supplementary protein powder for 4 months exerts antioxidant effects and increases muscle mass among American football players.Trial registrationUniversity Hospital Medical Information Network Clinical Trial Registry, UMIN000036036. Retrospectively registered in 2019.

【 授权许可】

CC BY