No difference between the effects of supplementing with soy protein versus animal protein on gains in muscle mass and strength in response to resistance exercise

Mark Messina, Heidi Lynch, Jared Dickinson, Katharine E. Reed

Research output: Contribution to journalArticle

Abstract

Much attention has been given to determining the influence of total protein intake and protein source on gains in lean body mass (LBM) and strength in response to resistance exercise training (RET). Acute studies indicate that whey protein, likely related to its higher leucine content, stimulates muscle protein synthesis to a greater extent than proteins such as soy and casein. Less clear is the extent to which the type of protein supplemented impacts strength and LBM in long-term studies (≥6 weeks). Therefore, a meta-analysis was conducted to compare the effect of supplementation with soy protein to animal protein supplementation on strength and LBM in response to RET. Nine studies involving 266 participants suitable for inclusion in the meta-analysis were identified. Five studies compared whey with soy protein, and four studies compared soy protein with other proteins (beef, milk, or dairy protein). Meta-analysis showed that supplementing RET with whey or soy protein resulted in significant increases in strength but found no difference between groups (bench press: χ2 = 0.02, p = .90; squat: χ2 = 0.22, p = .64). There was no significant effect of whey or soy alone (n = 5) on LBM change and no differences between groups (χ2 = 0.00, p = .96). Strength and LBM both increased significantly in the "other protein" and the soy groups (n = 9), but there were no between-group differences (bench: χ2 = 0.02, p = .88; squat: χ2 = 0.78, p = .38; and LBM: χ2 = 0.06, p = .80). The results of this meta-analysis indicate that soy protein supplementation produces similar gains in strength and LBM in response to RET as whey protein.

Original languageEnglish (US)
Pages (from-to)674-685
Number of pages12
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume28
Issue number6
DOIs
StatePublished - Nov 1 2018

Fingerprint

Soybean Proteins
Muscle Strength
Resistance Training
Meta-Analysis
Exercise
Proteins
Muscle Proteins
Milk Proteins
Caseins
Leucine
Whey Proteins

Keywords

  • Isoflavones
  • Lean body mass
  • Leucine
  • Meta-analysis
  • Plant protein

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Orthopedics and Sports Medicine
  • Nutrition and Dietetics

Cite this

No difference between the effects of supplementing with soy protein versus animal protein on gains in muscle mass and strength in response to resistance exercise. / Messina, Mark; Lynch, Heidi; Dickinson, Jared; Reed, Katharine E.

In: International Journal of Sport Nutrition and Exercise Metabolism, Vol. 28, No. 6, 01.11.2018, p. 674-685.

Research output: Contribution to journalArticle

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