Comparison of carbohydrate and milk-based beverages on muscle damage and glycogen following exercise.
ABSTRACT This study examined effects of carbohydrate (CHO), milk-based carbohydrate-protein (CHO-PRO), or placebo (P) beverages on glycogen resynthesis, muscle damage, inflammation, and muscle function following eccentric resistance exercise. Untrained males performed a cycling exercise to reduce muscle glycogen 12 hours prior to performance of 100 eccentric quadriceps contractions at 120% of 1-RM (day 1) and drank CHO (n = 8), CHO-PRO (n = 9; 5 kcal/kg), or P (n = 9) immediately and 2 hours post-exercise. At 3 hours post-eccentric exercise, serum insulin was four times higher for CHO-PRO and CHO than P (p < .05). Serum creatine kinase (CK) increased for all groups in the 6 hours post-eccentric exercise (p < .01), with the increase tending to be lowest for CHO-PRO (p < .08) during this period. Glycogen was low post-exercise (33+/-3.7 mmol/kg ww), increased 225% at 24 hours, and tripled by 72 hours, with no group differences. The eccentric exercise increased muscle protein breakdown as indicated by urinary 3-methylhistidine and increased IL-6 with no effect of beverage. Quadriceps isokinetic peak torque was depressed similarly for all groups by 24% 24 hours post-exercise and remained 21% lower at 72 hours (p < .01). In summary, there were no influences of any post-exercise beverage on muscle glycogen replacement, inflammation, or muscle function.
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ABSTRACT: Several studies on Caucasian volunteers have proven that milk is an effective recovery drink for athletes. Such benefit, however, cannot be directly applied to the lactose-intolerant Asian population. This study investigated the effects of ingesting water (WT), sports drink (SPD) and lactose-free milk (LFM) on cycling capacity.Journal of the International Society of Sports Nutrition 01/2014; 11(1):49. · 1.83 Impact Factor
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ABSTRACT: The purpose of this study was to examine the effects of whole body periodic acceleration (pGz) on exercise induced muscle damage (EIMD) related symptoms induced by unaccustomed eccentric arm exercise. Seventeen active young men (23.4 ± 4.6 yrs) made six visits to the research facility over a two-week period. On day one, subjects performed a maximum 1-repetition (1RM) elbow flexion test and were randomly assigned to the pGz (n=8) or control group (n=9). Criterion measurements were taken on Day 2, prior to and immediately following performance of the eccentric exercise protocol (10 sets, 10 repetitions using 120% 1RM) and after the recovery period. During subsequent sessions (24, 48, 72, and 96 h) these data were collected before pGz or passive recovery. Measurements included: isometric strength (MVC), blood markers (CK, MYO, IL-6, TNF-α, TBARS, PGF2α, protein carbonyls, uric acid, and nitrites), soreness, pain, circumference, and range of motion (ROM). Significantly higher MVC values were seen for pGz throughout the recovery period. Within group differences were seen in MYO, IL-6, IL-10, protein carbonyls, soreness, pain, circumference, and ROM showing small negative responses and rapid recovery for the pGz condition. Our results demonstrate that pGz can be an effective tool for the reduction of EIMD and may contribute to the training-adaptation cycle by speeding-up the recovery of the body due to its performance loss lessening effect.International journal of sports physiology and performance 03/2014; · 2.25 Impact Factor
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ABSTRACT: Attenuating muscle damage is important to subsequent sports performance. It is possible that pre-exercise protein intake could influence markers of muscle damage and benefit performance, however, published research provides conflicting results. At present no study has investigated protein and carbohydrate (PRO/CHO) co-ingestion solely pre-exercise, nor prior to basketball-specific exercise. The purpose of this study was to answer the research question; would pre-exercise protein intake enhance performance or attenuate muscle damage during a basketball simulation test?Journal of the International Society of Sports Nutrition 01/2014; 11:33. · 1.83 Impact Factor