There has been a rapid increase in researching the use of tart cherry supplements in the past 5 years, particularly for inflammatory conditions. Many formulations of cherry supplements exist, however there has been no comparison between these different types. This is particularly important in the realm of inflammation research because sugar is known to increase the inflammatory response. The pill form of cherry supplementation has no added sugar and is naturally low in sugar (\< 1g) while the juice form is higher from added sugar. Recent work indicates tart cherry consumption can change gut microbiota, which may modify inflammation. The purpose of this study is to look at the effects of taking a cherry supplement, either in capsule or juice form, on the gut microbiome, inflammation, and health-related variables such as blood pressure, glucose regulation and sleep quality.
Participants will consume a tart cherry or placebo product for 30 days and attend 5 visits in the Exercise Physiology Lab at Ohio University over the 30 day period. They will self-collect a stool sample at baseline, 14 days and 30 days after supplementation. Blood samples will be taken at baseline, 7 days, 14 days, and 30 days after supplementation. Throughout the study participates will rate symptoms (stomach, head, etc.), pain and sleep quality using an online survey for which the link will be emailed. Participants will maintain normal diet and exercise routine and to track these for the duration of the study.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
70
Two 8oz bottles of tart cherry juice concentrate daily for 30 days
Two 8oz bottles of placebo juice daily for 30 days
Two freeze dried tart cherry powder capsules daily for 30 days
Two placebo capsules daily for 30 days
Ohio University Exercise Physiology Lab
Athens, Ohio, United States
Changes in inflammation measured via tumor necrosis factor alpha (pg/mL)
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in inflammation measured via erythrocyte sedimentation rate (mm/hour)
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in inflammation measured via c-reactive protein (mg/L) and uric acid (mg/dL).
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in glucose regulation assessed via plasma glucose (mg/dL)
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in glucose regulation assessed via insulin (mIU/L)
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in glucose regulation assessed via glycated albumin (%).
Time frame: baseline, 7 days, 14 days, and 30 days post supplementation.
Changes in sleep quantity (hours and minutes) assessed via daily survey.
Time frame: daily for 30 days
Changes in sleep quality measured via 100mm visual analogue scale.
Time frame: daily for 30 days
Changes in gut microbiome bacterial counts
Time frame: baseline, 14 days, and 30 days post supplementation.
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