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Article

Effects of Peanut Protein Supplementation on Resistance Training Adaptations in Younger Adults

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School of Kinesiology, Auburn University, Auburn, AL 36849, USA
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Department of Nutrition, Dietetics and Hospitality Management, Auburn University, Auburn, AL 36849, USA
3
Athletics Department, Auburn University, Auburn, AL 36849, USA
4
Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine, Auburn, AL 36832, USA
*
Author to whom correspondence should be addressed.
Indicates co-principal investigators on awarded grant.
Current Address: Molecular and Applied Sciences Laboratory and Applied Physiology Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA.
Academic Editor: Antoni Pons
Nutrients 2021, 13(11), 3981; https://doi.org/10.3390/nu13113981
Received: 28 September 2021 / Revised: 29 October 2021 / Accepted: 5 November 2021 / Published: 9 November 2021
Protein supplementation is a commonly employed strategy to enhance resistance training adaptations. However, little research to date has examined if peanut protein supplementation is effective in this regard. Thus, we sought to determine if peanut protein supplementation (PP; 75 total g/d of powder providing 30 g/d protein, >9.2 g/d essential amino acids, ~315 kcal/d) affected resistance training adaptations in college-aged adults. Forty-seven college-aged adults (n = 34 females, n = 13 males) with minimal prior training experience were randomly assigned to a PP group (n = 18 females, n = 5 males) or a non-supplement group (CTL; n = 16 females, n = 8 males) (ClinicalTrials.gov trial registration NCT04707963; registered 13 January 2021). Body composition and strength variables were obtained prior to the intervention (PRE). Participants then completed 10 weeks of full-body resistance training (twice weekly) and PP participants consumed their supplement daily. POST measures were obtained 72 h following the last training bout and were identical to PRE testing measures. Muscle biopsies were also obtained at PRE, 24 h following the first exercise bout, and at POST. The first two biopsy time points were used to determine myofibrillar protein synthesis (MyoPS) rates in response to a naïve training bout with or without PP, and the PRE and POST biopsies were used to determine muscle fiber adaptations in females only. Dependent variables were analyzed in males and females separately using two-way (supplement × time) repeated measures ANOVAs, unless otherwise stated. The 24-h integrated MyoPS response to the first naïve training bout was similar between PP and CTL participants (dependent samples t-test p = 0.759 for females, p = 0.912 for males). For males, the only significant supplement × time interactions were for DXA-derived fat mass (interaction p = 0.034) and knee extensor peak torque (interaction p = 0.010); these variables significantly increased in the CTL group (p < 0.05), but not the PP group. For females, no significant supplement × time interactions existed, although interactions for whole body lean tissue mass (p = 0.088) and vastus lateralis thickness (p = 0.099) approached significance and magnitude increases in these characteristics favored the PP versus CTL group. In summary, this is the second study to determine the effects of PP supplementation on resistance training adaptations. While PP supplementation did not significantly enhance training adaptations, the aforementioned trends in females, the limited n-size in males, and this being the second PP supplementation study warrant more research to determine if different PP dosing strategies are more effective than the current approach. View Full-Text
Keywords: resistance training; females; peanut protein; muscle; protein synthesis resistance training; females; peanut protein; muscle; protein synthesis
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MDPI and ACS Style

Sexton, C.L.; Smith, M.A.; Smith, K.S.; Osburn, S.C.; Godwin, J.S.; Ruple, B.A.; Hendricks, A.M.; Mobley, C.B.; Goodlett, M.D.; Frugé, A.D.; Young, K.C.; Roberts, M.D. Effects of Peanut Protein Supplementation on Resistance Training Adaptations in Younger Adults. Nutrients 2021, 13, 3981. https://doi.org/10.3390/nu13113981

AMA Style

Sexton CL, Smith MA, Smith KS, Osburn SC, Godwin JS, Ruple BA, Hendricks AM, Mobley CB, Goodlett MD, Frugé AD, Young KC, Roberts MD. Effects of Peanut Protein Supplementation on Resistance Training Adaptations in Younger Adults. Nutrients. 2021; 13(11):3981. https://doi.org/10.3390/nu13113981

Chicago/Turabian Style

Sexton, Casey L., Morgan A. Smith, Kristen S. Smith, Shelby C. Osburn, Joshua S. Godwin, Bradley A. Ruple, Alex M. Hendricks, Christopher B. Mobley, Michael D. Goodlett, Andrew D. Frugé, Kaelin C. Young, and Michael D. Roberts. 2021. "Effects of Peanut Protein Supplementation on Resistance Training Adaptations in Younger Adults" Nutrients 13, no. 11: 3981. https://doi.org/10.3390/nu13113981

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