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Green tea compounds beat OSA-related brain deficits 5-22-08
Green tea compounds may help stave off the cognitive deficits that occur in
patients with obstructive sleep apnea (OSA), according to a study in the second
issue for May of the American Thoracic Society’s American Journal of Respiratory
and Critical Care Medicine.
The study showed rats with a condition that patients with OSA commonly
experience drinking water with green tea compounds performed better than those
drinking plain water in a memory test.
"Recent studies have demonstrated the neuroprotective activity of GTP in animal
models of neurodegenerative conditions such as Parkinson’s and Alzheimer’s
disease," wrote David Gozal, M.D., professor and director of Kosair Children's
Hospital Research Institute at the University of Louisville, lead author of the
article.
In the study, researchers gave drinking water with green tea polyphenols (GTP)
to a group of rats who were intermittently deprived of oxygen during 12-hour
“night” cycles, mimicking the intermittent hypoxia (IH) that humans with OSA
experience. Another group drank plain water.
People with OSA increase markers of oxidative stress and exhibit architectural
changes in their brain tissue in areas involved in learning and memory.
GTPs have anti-oxidant properties and they can scavenge free radicals and
relieve oxidative stress. Early studies showed these compounds may reduce the
risk of a variety of different diseases.
For the study, all rats were tested for markers of inflammation and oxidative
stress as well as for their performance in spatial learning and memory tasks.
The researchers found the IH rats that received drinking water with green tea
compounds performed significantly better in a water maze than the rats that
drank plain water. The maze is used to measure rats' ability of memorizing the
location of a hidden platform.
"GTP-treated rats exposed to IH displayed significantly greater spatial bias for
the previous hidden platform position, indicating that GTPs are capable of
attenuating IH-induced spatial learning deficits," wrote Dr. Gozal, adding that
GTPs "may represent a potential interventional strategy for patients" with
sleep-disordered breathing.