Ontology type: schema:ScholarlyArticle Open Access: True
2020-01-03
AUTHORSJessica M. Moon, Kayla M. Ratliff, Julia C. Blumkaitis, Patrick S. Harty, Hannah A. Zabriskie, Richard A. Stecker, Brad S. Currier, Andrew R. Jagim, Ralf Jäger, Martin Purpura, Chad M. Kerksick
ABSTRACTBackgroundLarge (48-g), isonitrogenous doses of rice and whey protein have previously been shown to stimulate similar adaptations to resistance training, but the impact of consuming smaller doses has yet to be compared. We evaluated the ability of 24-g doses of rice or whey protein concentrate to augment adaptations following 8 weeks of resistance training.MethodsHealthy resistance-trained males (n = 24, 32.8 ± 6.7 years, 179.3 ± 8.5 cm, 87.4 ± 8.5 kg, 27.2 ± 1.9 kg/m2, 27.8 ± 6.0% fat) were randomly assigned and matched according to fat-free mass to consume 24-g doses of rice (n = 12, Growing Naturals, LLC) or whey (n = 12, NutraBio Labs, Inc.) protein concentrate for 8 weeks while completing a standardized resistance training program. Body composition (DXA), muscular strength (one-repetition maximum [1RM]) and endurance (repetitions to fatigue [RTF] at 80% 1RM) using bench press (BP) and leg press (LP) exercises along with anaerobic capacity (Wingate) were assessed before and after the intervention. Subjects were asked to maintain regular dietary habits and record dietary intake every 2 weeks. Outcomes were assessed using 2 × 2 mixed (group x time) factorial ANOVA with repeated measures on time and independent samples t-tests using the change scores from baseline. A p-value of 0.05 and 95% confidence intervals on the changes between groups were used to determine outcomes.ResultsNo baseline differences (p > 0.05) were found for key body composition and performance outcomes. No changes (p > 0.05) in dietary status occurred within or between groups (34 ± 4 kcal/kg/day, 3.7 ± 0.77 g/kg/day, 1.31 ± 0.28 g/kg/day, 1.87 ± 0.23 g/kg/day) throughout the study for daily relative energy (34 ± 4 kcals/kg/day), carbohydrate (3.7 ± 0.77 g/kg/day), fat (1.31 ± 0.28 g/kg/day), and protein (1.87 ± 0.23 g/kg/day) intake. Significant main effects for time were revealed for body mass (p = 0.02), total body water (p = 0.01), lean mass (p = 0.008), fat-free mass (p = 0.007), BP 1RM (p = 0.02), BP volume (p = 0.04), and LP 1RM (p = 0.01). Changes between groups were similar for body mass (− 0.88, 2.03 kg, p = 0.42), fat-free mass (− 0.68, 1.99 kg, p = 0.32), lean mass (− 0.73, 1.91 kg, p = 0.37), fat mass (− 0.48, 1.02 kg, p = 0.46), and % fat (− 0.63, 0.71%, p = 0.90). No significant between group differences were seen for BP 1RM (− 13.8, 7.1 kg, p = 0.51), LP 1RM (− 38.8, 49.6 kg, p = 0.80), BP RTF (− 2.02, 0.35 reps, p = 0.16), LP RTF (− 1.7, 3.3 reps, p = 0.50), and Wingate peak power (− 72.5, 53.4 watts, p = 0.76) following the eight-week supplementation period.ConclusionsEight weeks of daily isonitrogenous 24-g doses of rice or whey protein in combination with an eight-week resistance training program led to similar changes in body composition and performance outcomes. Retroactively registered on as NCT04411173. More... »
PAGES60
http://scigraph.springernature.com/pub.10.1186/s12970-020-00394-1
DOIhttp://dx.doi.org/10.1186/s12970-020-00394-1
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/33261645
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"description": "BackgroundLarge (48-g), isonitrogenous doses of rice and whey protein have previously been shown to stimulate similar adaptations to resistance training, but the impact of consuming smaller doses has yet to be compared. We evaluated the ability of 24-g doses of rice or whey protein concentrate to augment adaptations following 8 weeks of resistance training.MethodsHealthy resistance-trained males (n\u00a0=\u200924, 32.8\u2009\u00b1\u20096.7\u2009years, 179.3\u2009\u00b1\u20098.5\u2009cm, 87.4\u2009\u00b1\u20098.5\u2009kg, 27.2\u2009\u00b1\u20091.9\u2009kg/m2, 27.8\u2009\u00b1\u20096.0% fat) were randomly assigned and matched according to fat-free mass to consume 24-g doses of rice (n\u00a0=\u200912, Growing Naturals, LLC) or whey (n\u2009=\u200912, NutraBio Labs, Inc.) protein concentrate for 8 weeks while completing a standardized resistance training program. Body composition (DXA), muscular strength (one-repetition maximum [1RM]) and endurance (repetitions to fatigue [RTF] at 80% 1RM) using bench press (BP) and leg press (LP) exercises along with anaerobic capacity (Wingate) were assessed before and after the intervention. Subjects were asked to maintain regular dietary habits and record dietary intake every 2 weeks. Outcomes were assessed using 2\u2009\u00d7\u20092 mixed (group x time) factorial ANOVA with repeated measures on time and independent samples t-tests using the change scores from baseline. A p-value of 0.05 and 95% confidence intervals on the changes between groups were used to determine outcomes.ResultsNo baseline differences (p\u00a0>\u20090.05) were found for key body composition and performance outcomes. No changes (p\u00a0>\u20090.05) in dietary status occurred within or between groups (34\u2009\u00b1\u20094\u2009kcal/kg/day, 3.7\u2009\u00b1\u20090.77\u2009g/kg/day, 1.31\u2009\u00b1\u20090.28\u2009g/kg/day, 1.87\u2009\u00b1\u20090.23\u2009g/kg/day) throughout the study for daily relative energy (34\u2009\u00b1\u20094 kcals/kg/day), carbohydrate (3.7\u2009\u00b1\u20090.77\u2009g/kg/day), fat (1.31\u2009\u00b1\u20090.28\u2009g/kg/day), and protein (1.87\u2009\u00b1\u20090.23\u2009g/kg/day) intake. Significant main effects for time were revealed for body mass (p\u00a0=\u20090.02), total body water (p\u00a0=\u20090.01), lean mass (p\u00a0=\u20090.008), fat-free mass (p\u00a0=\u20090.007), BP 1RM (p\u00a0=\u20090.02), BP volume (p\u00a0=\u20090.04), and LP 1RM (p\u00a0=\u20090.01). Changes between groups were similar for body mass (\u2212\u20090.88, 2.03\u2009kg, p\u00a0=\u20090.42), fat-free mass (\u2212\u20090.68, 1.99\u2009kg, p\u00a0=\u20090.32), lean mass (\u2212\u20090.73, 1.91\u2009kg, p\u00a0=\u20090.37), fat mass (\u2212\u20090.48, 1.02\u2009kg, p\u00a0=\u20090.46), and % fat (\u2212\u20090.63, 0.71%, p\u00a0=\u20090.90). No significant between group differences were seen for BP 1RM (\u2212\u200913.8, 7.1\u2009kg, p\u00a0=\u20090.51), LP 1RM (\u2212\u200938.8, 49.6\u2009kg, p\u00a0=\u20090.80), BP RTF (\u2212\u20092.02, 0.35 reps, p\u00a0=\u20090.16), LP RTF (\u2212\u20091.7, 3.3 reps, p\u00a0=\u20090.50), and Wingate peak power (\u2212\u200972.5, 53.4 watts, p\u00a0=\u20090.76) following the eight-week supplementation period.ConclusionsEight weeks of daily isonitrogenous 24-g doses of rice or whey protein in combination with an eight-week resistance training program led to similar changes in body composition and performance outcomes. Retroactively registered on as NCT04411173.",
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