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Study shows subjective sensitivity skin temperature change is decreased in older insomniac adults
September 02, 2008The inability to detect changes in skin temperature may contribute to the poor sleep of older adults who have insomnia
Westchester, Ill.-A study in the Sept. 1 issue of the journal Sleep shows that the subjective interpretation of temperature change is decreased in older adults, particularly those who suffer from insomnia.
The study is the first to find pronounced attenuation of subjective thermosensitivity in elderly insomniacs within the small range of normal bed temperatures. Researchers manipulated core body temperature, proximal skin temperature and distal skin temperature in order to observe the effect on sleep-onset latency. All temperature increases were seen as discomforting by the elderly with no sleep complaints, but none were discomforting to elderly insomniacs.
This inability to adequately feel how warm or cold the body is could contribute to the poor sleep of elderly insomniacs. Surprisingly, results indicate that warming the skin of elderly people may facilitate sleep onset despite the diminished ability to detect changes in temperature. Core body cooling also accelerates sleep onset in elderly insomniacs.
"We were positively surprised by the fact that although elderly insomniacs have troubles detecting small changes in skin temperature, the small changes are still effective in promoting sleep onset," said principal investigator Roy Raymann, PhD, psychophysiologist at the Netherlands Institute for Neuroscience in Amsterdam.
The two-day study was conducted in a sleep laboratory and involved eight elderly subjects without sleep complaints and eight elderly insomniacs. Their average age was 65.8 years. Participants were fitted with a thermosuit for skin temperature manipulation and were evaluated by overnight polysomnography.
The authors suggest that elderly insomniacs who are not sensitive to subjective changes in temperature may fail to change the bedding or their clothing when the temperature in the bedroom is too hot or too cold. The elderly may benefit from interventions that increase skin temperature, such as mild skin warming via controlled and feed-back looped electric blankets. Another suggestion is for the elderly to take a hot bath 1.5 to 2 hours before the planned bed time in order to warm the skin and lower core body temperature.
American Academy of Sleep Medicine
This inability to adequately feel how warm or cold the body is could contribute to the poor sleep of elderly insomniacs. Surprisingly, results indicate that warming the skin of elderly people may facilitate sleep onset despite the diminished ability to detect changes in temperature. Core body cooling also accelerates sleep onset in elderly insomniacs.
"We were positively surprised by the fact that although elderly insomniacs have troubles detecting small changes in skin temperature, the small changes are still effective in promoting sleep onset," said principal investigator Roy Raymann, PhD, psychophysiologist at the Netherlands Institute for Neuroscience in Amsterdam.
The two-day study was conducted in a sleep laboratory and involved eight elderly subjects without sleep complaints and eight elderly insomniacs. Their average age was 65.8 years. Participants were fitted with a thermosuit for skin temperature manipulation and were evaluated by overnight polysomnography.
The authors suggest that elderly insomniacs who are not sensitive to subjective changes in temperature may fail to change the bedding or their clothing when the temperature in the bedroom is too hot or too cold. The elderly may benefit from interventions that increase skin temperature, such as mild skin warming via controlled and feed-back looped electric blankets. Another suggestion is for the elderly to take a hot bath 1.5 to 2 hours before the planned bed time in order to warm the skin and lower core body temperature.
American Academy of Sleep Medicine
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