Effects of protein type and composition on postprandial markers of skeletal muscle an

New Exercise and Fitness Review

Effects of protein type and composition on postprandial markers of skeletal muscle an

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Background:We examined the acute effects of different dietary protein sources (0.19.g, dissolved in 1.ml of water) on skeletal muscle, adipose tissue and hypothalamic satiety-related markers in fasted, male Wistar rats (~250.g).Methods:Oral gavage treatments included: a) whey protein concentrate (WPC, n?=?15); b) 70:30 hydrolyzed whey-to-hydrolyzed egg albumin (70.W/30E, n?=?15); c) 50.W/50E (n?=?15); d) 30.W/70E (n?=?15); and e) 1.ml of water with no protein as a fasting control (CTL, n?=?14).Results:Skeletal muscle analyses revealed that compared to CTL: a) phosphorylated (p) markers of mTOR signaling [p-mTOR (Ser2481) and p-rps6 (Ser235/236)] were elevated 2?4-fold in all protein groups 90.min post-treatment (p?

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World Class Bodybuilding Forum

Effects of protein type and composition on postprandial markers of skeletal muscle an

Acute effects of a commercially-available pre-workout supplement on markers of traini

New Exercise and Fitness Review

Acute effects of a commercially-available pre-workout supplement on markers of traini

Background:Pre-workout supplements containing numerous ingredients claim to increase performance and strength. Product-specific research is important for identifying efficacy of combined ingredients. The purpose of this study was to evaluate the effects of a proprietary pre-workout dietary supplement containing creatine monohydrate, beta-alanine, L-Tarurine, L-Leucine, and caffeine, on anaerobic power, muscular strength, body composition, and mood states.Methods:In a double-blind, randomized, matched-pair design, twenty male subjects (mean?±?SD; 22.4?±?9.5 yrs, 76.9?±?11.2 kg, 22.7?±?9.5% body fat), consumed either 30 g of a pre-workout supplement (SUP) or maltodextrin placebo (PLC) 30 minutes before a resistance training workout, after completing baseline testing. Body composition was determined via dual-energy x-ray absorptiometry (DEXA). Subjects completed 12 vertical jumps for height (VJ) and one repetition maximum (1RM) and repetitions to failure lifts on bench (BPM) and leg press (LPM). Finally, subjects completed a Wingate power test on a cycle ergometer [mean power (WMP) and peak power (WPP)]. After baseline testing, participants completed eight days of supplementation and four split-body resistance-training bouts. Side effect questionnaires were completed daily 30 minutes after consuming the supplement. Subjects completed post-supplement testing on Day 8. Data were analyzed utilizing a 2?×?2 repeated measures ANOVA [treatment (PLC vs SUP)?×?time (T1 vs T2)] and ninety-five percent confidence intervals.Results:There were no significant treatment?×?time interactions (p?>?0.05). There were no significant changes in %body fat (%BF; ?-0.43?±?0.58; p?=?0.920), fat mass (?-2.45?±?5.72; p?=?0.988), or lean body mass (LBM; 10.9?±?12.2; p?=?0.848). 95% CI demonstrated significant LBM increases for both groups. There was a main effect for time for WPP (?100.5?±?42.7W; p?=?0.001), BPM (?8.0?±?12.9 lbs; p?=?0.001), and LPM (?80.0?±?28.8 lbs; p?=?0.001), with no significant differences between treatments. There was no significant difference in mood states between groups or over time.Conclusion:The proprietary pre-workout blend combined with eight days of training did not significantly (ANOVA) improve body composition or performance. While not significant, greater gains in LPM were demonstrated in the SUP group for lean body mass and lower body strength. Future studies should evaluate more chronic effects of proprietary pre-workout blends on total training volume and performance outcomes.

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World Class Bodybuilding Forum

Acute effects of a commercially-available pre-workout supplement on markers of traini