Single question about total lying time for assessing physical inactivity in community-dwelling older adults: a study of reliability and discriminant validity from sleeping time.
Satomi Kaneya, Hiroyuki Hashidate
PMID 32884175WHAT IT FOUND
In 54 healthy older adults, one question about daily lying time gave stable week-to-week answers and averaged 8.4 to 8.7 hours, more than 7.1 hours of sleep.
Key findings
01The 7-day average score for lying time had an ICC of 0.973, and daily lying times were 8.4 to 8.7 hours.
02Recalled lying time for the previous week averaged 8.4 hours/day, and recorded lying time for the next week averaged 8.7 hours/day, with no significant difference.
03Total lying time was distinct from sleep: lying time averaged 8.4 to 8.7 hours/day, sleep averaged 7.1 hours/day, and the correlations were r = 0.337 and r = 0.330.
STILL TO COME
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What it does not show
The study included only 54 healthy community-dwelling older adults with no cognitive impairment and excluded neurological, cardiovascular, or major musculoskeletal impairments. The lying-time measure was self-reported and was not compared with a device-based measure, so the paper does not show accuracy against an objective standard. Results may not generalize to institutionalized older adults, people with disabilities, or those with cognitive impairment or neurological disorders. The sample size met a minimum recommendation for reliability studies, so it is a single small study rather than evidence that the question is valid across populations.
Declared interests
No conflicts of interest were declared.
The easy way to misread this
Do not conclude that this single question accurately measures physical inactivity or sedentary behavior. The study only showed that self-reported lying time was stable and distinct from sleep in healthy community-dwelling older adults, and it did not compare the question with device-based measurement or include people with disabilities or cognitive impairment.