Skeletal Muscle Regulatory Markers Responses Following Whole And Egg White Ingestion In Resistance Trained Men
Allnutt, Amy Medicine & Science in Sports & Exercise: July 2020 - Volume 52 - Issue 7S - p 107
Protein ingestion is recommended to maximize muscular adaptations post resistance training (RT). Eggs are a rich food source commonly consumed post-workout to meet protein requirements. Although removing egg yolk is often promoted for the improvement of body composition (BC), whole-egg (WE) consumption has been shown to cause a greater stimulation of post-exercise muscle protein synthesis than egg-white (EW). However, changes in BC and skeletal muscle regulatory markers to chronic RT coupled with WE or EW consumption have not been evaluated.
PURPOSE: To compare the effects of WE vs. EW ingestion after 12 wks of RT on BC and skeletal muscle regulatory markers in RT men.
METHODS: Thirty RT men [age (24 ± 2 yrs), were randomized to either a WE (n=15) or EW (n=15) consumption group for 12 wks. The WE group ingested three WE while the EW group ingested six EW immediately post-workout and at the same time on non-training days. RT consisted of 10 exercises/session, 3x wk. Three sets of 3-14 reps (load was progressed) were performed for each exercise. Body weight, fat mass (FM), skeletal muscle mass (SMM) as well as serum follistatin (FOL), myostatin (MYO) and basic fibroblast growth factor (FGF-2) levels were measured at baseline and after 12 wks.
RESULTS: Significant main effects of time were observed for body weight, SMM, FOL and FGF-2 which significantly (P < 0.05) increased, and for FM and MYO which significantly (P < 0.05) decreased. However, no significant group × time interactions were noted for any markers. Although non-significant, the WE group had ~1 Kg of extra FM loss than EW group.
CONCLUSIONS: There are no differences in the changes achieved in BC and skeletal muscle regulatory factors after 12 wks of RT between WE and EW consumption. Although BC did not differ between groups, the ~1 Kg of extra FM loss seen after WE consumption may be an advantage for fitness enthusiasts with aesthetic goals.