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Diet and Exercise Alone Unlikely to Cure Sleep Apnea in Obese Patients

by VR Sreeraman on October 16, 2009 at 2:50 PM
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 Diet and Exercise Alone Unlikely to Cure Sleep Apnea in Obese Patients

While a strict diet and exercise program may prove beneficial for obese patients with mild to moderate obstructive sleep apnea (OSA), it is unlikely to eliminate the condition, according to a new study.

The results of the study, which has been published in the Oct. 15 issue of the Journal of Clinical Sleep Medicine, showed improvement in typical OSA symptoms including snoring, daytime sleepiness, impaired vigilance, poor quality of life and mood after the completion of a 16-week diet and exercise program.

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Weight loss was significant, with an average loss of 12.3 kg (about 27 pounds), representing 12.9 percent of baseline total body weight. Although weight loss reduced the average apnea-hypopnea index (AHI) by 25 percent from 24.6 to 18.3 breathing pauses per hour of sleep, the change was not statistically significant, the study found.

Principal investigator Maree Barnes, MBBS, sleep medicine practitioner and senior research fellow at the Institute for Breathing and Sleep at Austin Hospital in Victoria, Australia, said that the exercise program resulted in improved fitness and muscle strength, which is important in obese OSA patients; however, diet and exercise alone should not be relied upon to treat the condition.
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"Although there was some improvement in sleep disordered breathing, it was not seen in all patients and was not proportional to the degree of weight loss," said Barnes.

Twelve consecutive patients from the Institute for Breathing and Sleep who were newly diagnosed with OSA were included in the cohort study, and 10 completed the program. Participants had mild to moderate OSA, were obese with an average body mass index (BMI) of 36.1, were heavy snorers, had no significant comorbidities and were able to exercise. Participants had an average age of 42 years, and nine of 12 were female.

An initial evaluation was performed to assess sleep disordered breathing, cardiovascular risk factors, and neurobehavioral function prior to and following completion of the 16-week program.

The program used a proprietary low-energy diet (Optifast), and subjects participated in a hospital-based exercise schedule that included both aerobic and resistance training supervised by a physiologist and a physiotherapist. Subjects also completed questionnaires to assess subjective sleep quality, mood and quality of life.

Source: ANI
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