King Grub
2017-01-31, 12:57
Att använda vassleprotein eller inte gör varken till eller från.
Resistance training (RT) with nutritional strategies incorporating whey protein intake post-exercise can stimulate muscle protein synthesis (MPS) and elicit hypertrophy. The early phases of training-induced anabolic responses can be attenuated with longer-term training. It is currently unknown if short-term detraining (DT) can restore these blunted anabolic responses during a subsequent retraining (ReT) period. Twenty resistance-trained males (age 20.95 +/- 1.23 y; n=20) were randomized into one of two groups (PRO or CHO; 25 grams) in a double-blind manner. Participants followed a 4-day per week RT program (4-week RT; 2-week DT; 4-week ReT) while consuming their respective supplement only on workout days during RT and ReT, but every day during DT. At baseline, 4 weeks following RT (post-RT), 2 weeks following DT (post-2-week-DT), and after 4 weeks of ReT following DT (post-ReT), lower-body strength (LPS) was assessed and rectus femoris cross-sectional area (RF-CSA) and lean mass changes were assessed by ultrasonography and DEXA, respectively. A factorial 2x4 (group by time) ANOVAs with repeated measures were used with a probability level at <= .05. LPS was elevated throughout the 10-week training study (p=.003) with no decrease in LPS after DT in both groups. Although not statistically significant, both groups retained lean mass following DT. A 2-week period of DT appeared to retain muscular strength in resistance-trained males. Therefore, a short-term period of DT can potentially retain lower body strength in young resistance-trained males irrespective of supplementing with 25 grams of whey protein post-exercise.
Resistance-Training Induced Elevations in Muscular Strength in Trained Males are Maintained after Two Weeks of Detraining and not Differentially Impacted by Whey Protein Supplementation. Journal of Strength & Conditioning Research, January 24, 2017.
Resistance training (RT) with nutritional strategies incorporating whey protein intake post-exercise can stimulate muscle protein synthesis (MPS) and elicit hypertrophy. The early phases of training-induced anabolic responses can be attenuated with longer-term training. It is currently unknown if short-term detraining (DT) can restore these blunted anabolic responses during a subsequent retraining (ReT) period. Twenty resistance-trained males (age 20.95 +/- 1.23 y; n=20) were randomized into one of two groups (PRO or CHO; 25 grams) in a double-blind manner. Participants followed a 4-day per week RT program (4-week RT; 2-week DT; 4-week ReT) while consuming their respective supplement only on workout days during RT and ReT, but every day during DT. At baseline, 4 weeks following RT (post-RT), 2 weeks following DT (post-2-week-DT), and after 4 weeks of ReT following DT (post-ReT), lower-body strength (LPS) was assessed and rectus femoris cross-sectional area (RF-CSA) and lean mass changes were assessed by ultrasonography and DEXA, respectively. A factorial 2x4 (group by time) ANOVAs with repeated measures were used with a probability level at <= .05. LPS was elevated throughout the 10-week training study (p=.003) with no decrease in LPS after DT in both groups. Although not statistically significant, both groups retained lean mass following DT. A 2-week period of DT appeared to retain muscular strength in resistance-trained males. Therefore, a short-term period of DT can potentially retain lower body strength in young resistance-trained males irrespective of supplementing with 25 grams of whey protein post-exercise.
Resistance-Training Induced Elevations in Muscular Strength in Trained Males are Maintained after Two Weeks of Detraining and not Differentially Impacted by Whey Protein Supplementation. Journal of Strength & Conditioning Research, January 24, 2017.