Effects of an exercise program with video: targeting older female residents in a remote island.
Yuji Maruyama
PMID 33132525WHAT IT FOUND
A three-month DVD exercise program improved standing balance in older women living on a remote island.
Walking speed, grip strength, and cognitive measures did not change significantly. Self-selection into groups limits confidence in the results.
Key findings
01One-leg standing time with eyes open increased significantly in the exercise group from 40.3 to 60.0 seconds, while the control group decreased slightly from 45.7 to 40.3 seconds.
02There were no statistically significant changes in grip strength, 10-meter obstacle walking time, or cerebral blood flow after the intervention.
03Participants self-selected into the exercise or control group rather than being randomly assigned.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Participants self-selected into groups, introducing significant selection bias. The sample size was very small (19 participants). The study was not blinded; participants knew their allocation. The intervention period (3 months) may have been too short to detect changes in walking or cognitive outcomes. The paper notes 'insufficient exercise time' as a limitation.
Declared interests
None declared.
The easy way to misread this
Do not assume the DVD caused the balance improvement. Since women chose whether to exercise, the results may reflect pre-existing differences in health or motivation between those who volunteered for the exercise group and those who did not.