Effects of daily 24-gram doses of rice or whey protein on resistance training adaptations in trained males

Jessica 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, Jessica 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

Abstract

Background: Large (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.

Methods: Healthy 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.

Results: No 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.

Conclusions: Eight 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 .

Keywords: Body composition; Efficacy; Endurance; Fat-free mass; Performance; Plant proteins; Protein isolates; Protein source; Rice; Strength; Supplementation; Whey.

Conflict of interest statement

RJ is an inventor of patent WO2014138305 (US 9,820,504) and has not been involved in the data collection and analysis or writing the manuscript. All other authors declare no competing interests. All other authors declare no conflicts of interest.

Figures

Fig. 1
Fig. 1
Research Design Overview
Fig. 2
Fig. 2
CONSORT diagram
Fig. 3
Fig. 3
(Sub-Panel a & b): DXA fat-free mass (in kilograms) in rice and whey protein supplemented groups. Panel a: Raw data (Rice = 0.05 ± 4.8% change; Whey = 1.5 ± 4.5% change); Panel b: Individual response data. All data is presented as means ± SD. * = Different from within-group week 0 value
Fig. 4
Fig. 4
(Sub-Panel a & b): Bench-press one-repetition maximum (1RM) in rice and whey protein supplemented groups. Panel a: Raw data (Rice = 3.9 ± 4.9% change; Whey = 2.4 ± 5.0% change); Panel b: Individual response data. All data is presented as means ± SD. * = Different from within-group week 0 value

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