Muscle Damage Clinical Trial
Official title:
The Effect of New Zealand Blackcurrant (NZBC) Supplementation on Indices of Muscle Damage Following Strenuous Exercise
The study aims to examine the effect of a New Zealand blackcurrant (NZBC) supplement on markers of muscle damage and recovery following strenuous resistance exercise. The investigation will compare responses between an experimental (NZBC capsule, 300 mg/day) and placebo (PLA capsule, 300 mg sugar) group. Participants will attend a screening session where they will consent to the study, complete a pre-activity medical questionnaire and have their height, weight and resting blood pressure measured. If the participants meet the inclusion criteria they will perform a familarisation session on the muscle strength assessment. Participants will be randomized to NZBC or placebo groups, and consume one capsule in the morning (between 6-10 am) for 12 days. This is a double-blinded study, which means that the participant and the study team will not know which group the participants are assigned to until the study is over. On day 8 participants will perform a strenuous bout of upper body resistance exercise on the isokinetic dynamometer (exercise device). Muscle strength and soreness, arm circumference, and elbow range of motion will be measured, and a fasted blood sample will be collected, before and 24, 48, 72 & 96 hours after the muscle fatigue protocol (on days 9, 10, 11 & 12). A marker of muscle damage (creatine kinase [CK] concentration) will be measured in the blood samples. Participants will also be asked to complete a 6-day dietary record, beginning on day 7 and ending on the final day of testing (day 12).
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