Article by the experts: Bagheri et al.
The study explored the effects of consuming egg white (EW) or whole egg (WE) daily on muscle regulation markers during a 12-week resistance training (RT) period in men who already do resistance training. The findings showed that consuming egg yolk during the RT period did not influence changes in various muscle regulatory markers, muscle strength development, or body composition alterations when protein intake was consistent. Egg protein intake post-exercise has been extensively studied due to its amino acid profile, which includes all essential amino acids and leads to relatively quick post-meal aminoacidemia or leucinemia. The yolk, which contains a significant portion of the total egg protein, could potentially blunt the post-meal muscle protein synthesis (MPS) response, especially after exercise when protein needs may be increased. However, the current data suggests that when total egg protein consumption and total daily protein intake are controlled, the removal of yolk has no impact on body composition and functional adaptations to chronic RT. The study’s longitudinal data contrasts with previous findings from a study by Van Vliet and colleagues, which studied the acute effects of WE vs. EW consumption on post-meal MPS in young men following a single bout of RT. Despite the lack of difference in the measures of amino acid or leucine availability, sensing, and uptake, there was a greater stimulation of post-exercise MPS following WE consumption. The authors attributed the superior effects of WE on post-meal and post-exercise MPS to other nutrient constituents of the yolk that are absent in EW, such as vitamin D and lipids. The study investigated the effects of consuming whole eggs (WE) versus egg whites (EW) on muscle regulation markers during a 12-week resistance training (RT) period. Despite initial results suggesting that we could lead to better RT outcomes, long-term data did not support this. The study found no impact of the type of egg protein consumed on the levels of circulating skeletal muscle regulatory markers, which can either stimulate or inhibit muscle growth. The research also found that 8 weeks of RT increased follistatin (FLST) and decreased myostatin (MSTN) levels in middle-aged men. Similarly, 8 weeks of concurrent training increased FLST and decreased MSTN levels in sarcopenic elderly men. A combination of RT and endurance exercises led to an increase in TGF-β1 levels after 8 weeks in type II diabetes patients, but these levels tend to decrease with ongoing training. Even though the non-protein components in egg yolk may temporarily influence muscle protein synthesis (MPS), they didn’t seem to have any impact on the skeletal muscle regulatory markers. The study suggests that total protein intake appears to be a key factor in many post-digestive changes in anabolic signaling proteins when combined with adequate RT stimulus. Ultimately, the absence of differences between groups in any of the skeletal muscle regulatory markers is consistent with the similar whole-body outcomes observed between groups.
Comentários