| dc.description.abstract | The purpose of this research was to examine whether short-term ingestion of a powdered tart cherry supplement surrounding intense resistance and endurance exercise attenuates muscle soreness, while reducing markers of muscle damage, inflammation, and oxidative stress.
23 healthy, resistance-trained men (20.9±2.6 yr, 14.2±5.4% body fat, 63.9±8.6 kg FFM) were recruited for the resistance study, while 27 endurance trained runners or triathlete (21.8±3.9 yr, 15.0±6.0% body fat, 67.4±11.8 kg) men and women were examined in the endurance study. Subjects were matched based on relative maximal back squat strength or average projected race pace, age, body weight, and fat free mass. Subjects were randomly assigned to ingest, in a double blind manner, capsules containing a placebo (P) or powdered tart cherries [CherryPURE®] (TC). Participants supplemented one time daily (480 mg/d) for 10-d including the day of exercise up to 48-hr post-exercise. Resistance study subjects performed 10 sets of 10 repetitions at 70% 1-RM back squat exercise, while endurance subjects completed a half-marathon run (21.1 km) under 2-hr (111.98±11.9 min). Fasting blood samples and quadriceps muscle soreness ratings were taken pre-exercise, 60-min, 24-h, and 48-h post-exercise and analyzed by MANOVA with repeated measures.
Muscle soreness perception in the vastus medialis (1/4) (p=0.10) and the vastus lateralis (1/4) (p=0.024) tended to be lower in TC over time compared to P following resistance exercise. TC induced changes in serum creatinine (p=0.03, p=0.047) and total protein (p=0.018, p=0.081) that were lower over time and smaller from pre-lift levels compared to P in trained individuals. Despite lower TAS activity pre-run in TC compared to P (endurance), changes from pre-run levels revealed a linear increase in TAS activity during recovery in TC that was statistically different from P and pre-run levels. IL-6 levels (endurance) were lower in TC compared to P over time (p=0.053). Subjects in the TC group tended to have smaller deviations from predicted race pace (p=0.091) compared to P (endurance). Short-term supplementation of Montmorency powdered tart cherries surrounding a single bout of intense exercise, appears to be an effective dietary supplement to attenuate muscle soreness and markers of muscle catabolism, while reducing inflammatory stress, better maintaining redox balance, and increasing performance in trained individuals. | en |
