It looks like the Xtend vs Powerade study is up:
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Going through the diet I was thinking it looks very much like Chuck Rudolf's diet and sure enough it was his.
So Xtend group did not lose muscle. Both groups gained strength. They were cutting.
This paragraphs shows what happens when you diet with no refeed for 8 weeks:
So metabolism went down significantly in Xtend group but not significantly compared to carb group where it must have gone down insignificantly as they claim it did not change. Interesting
Seems like the cliffs:
The BCAA group lost fat mass (−0.05 ± 0.08 kg;p < .05)
and maintained lean mass, while the
CHO group lost lean mass (−0.90 ± 0.06 kg; p < .05)
and body mass (−2.3 ± 0.7 kg; p < .05).
Both groups increased 1RM squat, but the increase in the BCAA group (15.1 ± 2.2 kg; p < .05)
was greater (P < 0.05) than the CHO group.
The BCAA group increased 1RM bench press (7.1 ± 1.6 kg; P < 0.05),
while the CHO group decreased strength (−3.7 ± 2.3 kg; P < 0.05). The only change in muscular endurance was an increase in repetitions to fatigue (5.3 ± 0.2; p < .05) in the CHO group.
Studied Group:
Seventeen males (between the ages of 21 and 28) who self-reported as resistance trained (defined as consistent whole body resistance
training for at least 2 years prior to the onset of the study) volunteered for the study.
Dietary Features:
The caloric-restricted diet was designed as an 8 week “cut diet” for reducing body fat, and used a modified carbohydrate-restricted diet approach (percent of total calories for
workout days were 30 % carbohydrates, 35 % protein and 35 % fat and for off days were 25 % carbohydrates, 40 % protein and 35 % fat)
Supp Protocol:
Each participant was randomly assigned to either the BCAA supplement group (BCAA; 14 g of a BCAA nutritional supplement containing
seven grams of BCAA prior to and following each workout for a total of 14 g of BCAA in 28 g BCAA commercial product) or the carbohydrate nutritional supplement (CHO;
14 g of a carbohydrate based nutritional supplement (POWERADE ®) prior to and following each workout, for a total of 28 g).
Conclusion:
However, our data suggest that under hypocaloric conditions,
those who participate in heavy resistance training can maintain lean mass and muscular performance by utilizing a BCAA product pre and post workout. Further, while this
protocol resulted in a loss of lean mass in the CHO group, the improvement in lower body strength and repetitions to fatigue suggest that minimal CHO supplementation on a cut diet may help to maintain some performance measures.
at:
i really appreciate that!
