No Significant Differences in Muscle Growth and Strength Development When Consuming Soy and Whey Protein Supplements Matched for Leucine Following a 12 Week Resistance Training Program in Men and Women: A Randomized Trial

Heidi M. Lynch, Matthew P. Buman, Jared M. Dickinson, Lynda B. Ransdell, Carol S. Johnston and Christopher M. Wharton
Additional contact information
Heidi M. Lynch: Department of Kinesiology, Point Loma Nazarene University, San Diego, CA 92106, USA
Matthew P. Buman: College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA
Jared M. Dickinson: Health Sciences, Central Washington University, Ellensburg, WA 98926, USA
Lynda B. Ransdell: College of Health and Human Services, Northern Arizona University, Flagstaff, AZ 86011, USA
Carol S. Johnston: College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA
Christopher M. Wharton: College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA

IJERPH, 2020, vol. 17, issue 11, 1-15

Abstract: There are conflicting reports regarding the efficacy of plant versus animal-derived protein to support muscle and strength development with resistance training. The purpose of this study was to determine whether soy and whey protein supplements matched for leucine would comparably support strength increases and muscle growth following 12 weeks of resistance training. Sixty-one untrained young men ( n = 19) and women ( n = 42) (18–35 year) enrolled in this study, and 48 completed the trial (17 men, 31 women). All participants engaged in supervised resistance training 3×/week and consumed 19 grams of whey protein isolate or 26 grams of soy protein isolate, both containing 2 g (grams) of leucine. Multi-level modeling indicated that total body mass (0.68 kg; 95% CI: 0.08, 1.29 kg; p < 0.001), lean body mass (1.54 kg; 95% CI: 0.94, 2.15 kg; p < 0.001), and peak torque of leg extensors (40.27 Nm; 95% CI: 28.98, 51.57 Nm, p < 0.001) and flexors (20.44 Nm; 95% CI: 12.10, 28.79 Nm; p < 0.001) increased in both groups. Vastus lateralis muscle thickness tended to increase, but this did not reach statistical significance (0.12 cm; 95% CI: −0.01, 0.26 cm; p = 0.08). No differences between groups were observed ( p > 0.05). These data indicate that increases in lean mass and strength in untrained participants are comparable when strength training and supplementing with soy or whey matched for leucine.

Keywords: leucine; muscle; skeletal; muscle strength (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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