Carbon Monoxide and Exercise Prevents Diet‐Induced Obesity and Metabolic Dysregulation Without Affecting Bone

Objective Carbon monoxide (CO) may counteract obesity and metabolic dysfunction in rodents consuming high‐fat diets, but the skeletal effects are not understood. This study investigated whether low‐dose inhaled CO (250 ppm) with or without moderate intensity aerobic exercise (3 h/wk) would limit die...

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Bibliographic Details
Published in:Obesity (Silver Spring, Md.) Md.), 2020-05, Vol.28 (5), p.924-931
Main Authors: Gasier, Heath G., Yu, Tianzheng, Swift, Joshua M., Metzger, Corrine E., McNerny, Erin M., Swallow, Elizabeth A., Piantadosi, Claude A., Allen, Matthew R.
Format: Article
Language:English
Subjects:
Adipocytes
Aerobics
Bone density
Bone marrow
Carbon monoxide
Diet
Exercise
Fitness equipment
Fitness training programs
Fractures
Gas detectors
Laboratories
Mechanical properties
Metabolism
Nutrition research
Obesity
Physical fitness
Physiology
Plasma
Proteins
Sucrose
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Summary:Objective Carbon monoxide (CO) may counteract obesity and metabolic dysfunction in rodents consuming high‐fat diets, but the skeletal effects are not understood. This study investigated whether low‐dose inhaled CO (250 ppm) with or without moderate intensity aerobic exercise (3 h/wk) would limit diet‐induced obesity and metabolic dysregulation and preserve bone health. Methods Obesity‐resistant (OR) rats served as controls, and obesity‐prone (OP) rats were randomized to sedentary, sedentary plus CO, exercise, or CO plus exercise. For 10 weeks, OP rats consumed a high‐fat, high‐sucrose diet, whereas OR rats consumed a low‐fat control diet. Measurements included indicators of obesity and metabolism, bone turnover markers, femoral geometry and microarchitecture, bone mechanical properties, and tibial morphometry. Results A high‐fat, high‐sucrose diet led to obesity, hyperinsulinemia, and hyperleptinemia, without impacting bone. CO alone led only to a modest reduction in weight gain. Exercise attenuated weight gain and improved the metabolic profile; however, bone fragility increased. Combined CO and exercise led to body mass reduction and a metabolic state similar to control OR rats and prevented the exercise‐induced increase in bone fragility. Conclusions CO and aerobic exercise training prevent obesity and metabolic sequelae of nutrient excess while stabilizing bone physiology.
ISSN:1930-7381
1930-739X
DOI:10.1002/oby.22768