Efficacy of Tart Cherry Juice in Reducing Muscle Injury and Biomarkers of Muscle Damage Among Healthy Adults

Study Overview
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Brief Summary
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The purpose of this study is to assess the effects of tart cherry juice to reduce serum biomarkers of inflammation and reduce muscle soreness in healthy adults who undergo a bout of controlled eccentric exercise.

Detailed Description
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Numerous antioxidant and anti-inflammatory agents have been identified in tart cherries, and a study among healthy, non-exercising individuals demonstrated that tart cherries decreased post-exercise weakness and muscle pain. The purpose of this study is to assess the analgesic and myoprotective effects of tart cherry juice among healthy subjects in a randomized, placebo controlled, double-blind, crossover design trial. Fifteen healthy individuals will perform a bout of eccentric elbow flexion contractions (2 x 10 near maximum), and will then ingest 10 fl oz of a cherry juice or a placebo juice twice a day for four days, beginning immediately post exercise. Before and after exercise, and for three days following the eccentric exercise, blood will be drawn to measure serum biomarkers of muscle damage and muscle soreness will be recorded. The protocol will be repeated after a 9-10 day washout period with subjects consuming the alternative juice for the second trial. The opposite arm will perform the eccentric exercise for the second bout to avoid the repeated bout protective effect. The study's outcomes are 1) to assess changes in serum biomarkers of muscle damage, and 2) to assess changes in muscle soreness.

Official Title
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Efficacy of Tart Cherry Juice in Reducing Muscle Injury and Biomarkers of Muscle Damage Among Healthy Adults

Conditions
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Inflammation, Pain

Intervention / Treatment
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* Dietary Supplement: tart cultivar Montmorency cherry juice
* Dietary Supplement: placebo cherry fruit drink


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: no regular upper body strength training no elbow flexor pain, no history of elbow or shoulder injury ability and willingness not to take any anti-inflammatory or pain relieving drugs during the course of the study, not to seek any other treatment for any symptoms of muscle damage directly resulting from the exercises performed as part of the study, and not to exercise their upper extremities during the study. Exclusion Criteria: individuals who have used or are using antiepileptic drugs for pain, acupuncture, or transcutaneous electrical nerve stimulation within 3 weeks before enrollment recent use (within 5 half-lives) of topical medications/anesthetics, muscle relaxants, tender point anesthetic injections within 2 months systemic steroid use within 3 months any investigational drug/device use in the prior 30 days individuals who have Type 1 or Type 2 Diabetes individuals who are pregnant

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: tart cherry juice<br> | Dietary Supplement: tart cultivar Montmorency cherry juice<br> <br> |
| Placebo Comparator: cherry flavored fruit drink<br> | Dietary Supplement: placebo cherry fruit drink<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Lactate | Primary outcomes include measurement of serum and plasma biomarkers that provide a generalized measurement of inflammatory activity; these include Creatine Kinase (CK), Aspartate aminotransferase (AST), Lactate dehydrogenase (LDH), and lactate. | duration of intervention, average of 18 days per participant | 
| Creatine Kinase | Primary outcomes include measurement of serum and plasma biomarkers that provide a generalized measurement of inflammatory activity; these include Creatine Kinase (CK), Aspartate aminotransferase (AST), Lactate dehydrogenase (LDH), and lactate. | duration of intervention, average of 18 days per participant | 
| Aspartate aminotransferase | Primary outcomes include measurement of serum and plasma biomarkers that provide a generalized measurement of inflammatory activity; these include Creatine Kinase (CK), Aspartate aminotransferase (AST), Lactate dehydrogenase (LDH), and lactate. | duration of intervention, average of 18 days per participant | 
| Lactate dehydrogenase | Primary outcomes include measurement of serum and plasma biomarkers that provide a generalized measurement of inflammatory activity; these include Creatine Kinase (CK), Aspartate aminotransferase (AST), Lactate dehydrogenase (LDH), and lactate. | duration of intervention, average of 18 days per participant | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Secondary outcomes includes measurement of physical symptoms of exercise-induced muscle damage and soreness as measured by a muscle myometer. |  | duration of intervention, average of 18 days per participant | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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pain, inflammation, muscle damage