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The Effect of Soy‐Dairy Protein Blend Supplementation during Resistance Exercise Training
Author(s) -
Reidy Paul,
Borack Michael,
Markofski Melissa,
Dickinson Jared,
Deer Rachel,
Husaini Syed,
Walker Walker,
Igbinigie Sherry,
Cope Mark,
Mukherjea Ratna,
Jennings Kristofer,
Volpi Elena,
Rasmussen Blake
Publication year - 2015
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.29.1_supplement.129.5
Subject(s) - lean body mass , isometric exercise , endocrinology , placebo , zoology , medicine , resistance training , ingestion , leg press , soy protein , chemistry , whey protein , food science , body weight , biology , alternative medicine , pathology
Soy‐dairy protein blend (PB) ingestion prolongs the muscle protein synthesis response to a bout of resistance exercise. The efficacy of PB supplementation with resistance exercise training (RET) has not been evaluated in chronic studies. Our aim was to determine the effect of PB supplementation during RET on lean body mass (LBM), muscle thickness and strength. Healthy young men participated in supervised whole body progressive RET at 60‐80% 1 maximum (1‐RM), 3d/wk for 3 months. Participants were randomized to one of three treatments to ingest 22g protein as soy‐dairy protein blend (PB, N=23), whey protein isolate (WP, N=22) or an isocaloric placebo, 22g maltodextrin (MP, N=23) daily. Whole body lean mass (LBM), muscle strength (dynamometry & 1‐& 8‐RM testing) and vastus lateralis muscle thickness (MT) were assessed at pre & post RET. All treatments increased LBM (p<0.05). PB exhibited a trend for greater LBM change compared to MP (0.92 kg: ‐0.12, 1.95); however, there was no difference in LBM change between WP & MP. Muscle strength (RM tested) and thickness increased similarly for all treatments. All treatments increased isometric knee extension and flexion torque (P<0.05). Both protein‐supplemented treatments increased isokinetic knee extension torque (P<0.05). In conclusion, a soy‐dairy protein blend may enhance LBM during a 3 month RET period, and minor differences in strength between treatments were observed.