Just came across this article and thought I'd share.
Montmorency Cherry Juice Reduces
Muscle Damage Caused by Intensive
Strength Exercise
JOANNA L. BOWTELL1, DAVID PAUL SUMNERS1, AMY DYER2, PATRICK FOX1, and KATYA N. MILEVA1
1Sports and Exercise Science Research Centre, London South Bank University, London, UNITED KINGDOM;
and 2UK Anti-Doping, Oceanic House, London, UNITED KINGDOM
ABSTRACT
BOWTELL, J. L., D. P. SUMNERS, A. DYER, P. FOX, and K. N. MILEVA. Montmorency Cherry Juice Reduces Muscle Damage
Caused by Intensive Strength Exercise. Med. Sci. Sports Exerc., Vol. 43, No. 8, pp. 1544–1551, 2011. Purpose: Montmorency cherries
contain high levels of polyphenolic compounds including flavonoids and anthocyanins possessing antioxidant and anti-inflammatory
effects. We investigated whether the effects of intensive unilateral leg exercise on oxidative damage and muscle function were attenuated
by consumption of a Montmorency cherry juice concentrate using a crossover experimental design. Methods: Ten well-trained male
overnight-fasted athletes completed two trials of 10 sets of 10 single-leg knee extensions at 80% one-repetition maximum. Trials were
separated by 2 wk, and alternate legs were used in each trial. Participants consumed each supplement (CherryActive! (CA) or isoenergetic
fruit concentrate (FC)) for 7 d before and 48 h after exercise. Knee extension maximum voluntary contractions (MVC) were
performed before, immediately after, and 24 and 48 h after the damaging exercise. Venous blood samples were collected at each time
point, and serum was analyzed for creatine kinase (CK) activity, nitrotyrosine, high-sensitivity C-reactive protein, total antioxidant
capacity, and protein carbonyls (PC). Two-way repeated-measures ANOVA were used for statistical analysis of the data. Results: MVC
force recovery was significantly faster (24 h: CA 90.9% T 4.2% of initial MVC vs FC 84.9% T 3.4% of initial MVC; 48 h: CA 92.9% T
3.3% of initial MVC vs FC 88.5% T 2.9% of initial MVC (mean T SEM); P G 0.05) after CA than FC consumption. Only serum CK and
PC increased significantly from baseline, peaking 24 h after exercise (P G 0.001). The exercise-induced increase in CK activity was not
different between trials. However, both the percentage (24 h after: CA 23.8% T 2.9% vs FC 82.7% T 11.7%; P = 0.013) and absolute
(24 h after: CA 0.31 T 0.03 nmolImgj1 protein vs FC 0.60 T 0.08 nmolImgj1 protein; P = 0.079) increase in PC was lower in CA than
FC trials. Conclusions: Montmorency cherry juice consumption improved the recovery of isometric muscle strength after intensive
exercise perhaps owing to the attenuation of the oxidative damage induced by the damaging exercise. Key Words: ANTIOXIDANT,
PROTEIN CARBONYL, OXIDATIVE DAMAGE, MUSCLE STRENGTH