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Exercise Promotes Gastrointestinal Health

by Mohamed Fathima S on February 16, 2019 at 2:41 PM
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Exercise Promotes Gastrointestinal Health

Earlier studies have indicated that like human cells, bacterial cells in our body play a vital role in our physiology. Also, a greater diversity of gut microbiota (number of different species and evenness of these species' population) contributes to better health. Now, a recent study has shown that having good cardiorespiratory fitness (efficiency with which we transport oxygen to our tissues) is a good predictor of gut microbiota diversity.

The findings suggest that exercise at a sufficiently high intensity, to improve cardiorespiratory fitness, may support health through favorable alterations in the presence, activity and clustering of gut microbes. Such exercise-induced improvements, in cardiorespiratory fitness, often correspond with central (e.g. increased volume of blood pumped by the heart each beat) and peripheral adaptations (e.g. increased number of capillaries to transport oxygen from blood to muscles).

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Before now, it was understood that higher cardiorespiratory fitness tended to coincide with greater gut microbiota diversity, but it was unclear whether this relationship was attributable to body fat percentage or physical activities of daily-living. Since cancer treatment is known to trigger physiological changes detrimental to cardio-metabolic health, including increased body fat percentage and declining cardiorespiratory fitness, this research was performed on cancer survivors. In total, 37 non-metastatic breast cancer survivors, who had completed treatment at least one year prior, were enrolled.

Participants performed a graded exercise test to estimate peak cardiorespiratory fitness, assessments of total energy expenditure and examination of gut microbiota from fecal swipes. The results showed that participants with the higher cardiorespiratory fitness had significantly greater gut microbiota diversity compared to less fit participants. Further statistical analyses highlighted that cardiorespiratory fitness accounted for roughly a quarter of the variance in species richness and evenness, independent of body fat percent.
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These data offer intriguing insight into the relationship between cardiorespiratory fitness and gut microbiota diversity. However, given the cross-sectional nature of the study design, the research team's findings are correlative in nature. The participant sample was restricted to women with a history of breast cancer, who tended to exhibit low cardiorespiratory fitness and other health problems, meaning generalization to other groups should be made with caution.

Stephen Carter, lead author of the paper from Indiana University, is enthusiastic about continuing his team's research:

"Our group is actively pursuing an interventional study to determine how variation in exercise intensity can influence gut microbiota diversity under controlled-feeding conditions to uncover how exercise may affect functional outcomes of gut microbiota, as well as, studying how exercise prescription may be optimized to enhance health outcomes among clinical populations."



Source: Eurekalert
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