Percentage of decline in individual proprioceptors in older adults.
Kazunori Yamazaki, Yoshihito Sakai, Tadashi Ito and 2 others
PMID 39239420WHAT IT FOUND
Older adults had smaller sway responses to vibration than young adults, indicating reduced proprioception in lower leg and trunk muscle spindles.
The study describes group differences only and did not test treatment or fall outcomes.
Key findings
01Older adults showed significantly smaller sway values than young adults at all three vibration intervals for both the lower legs and trunk.
02Only 44.3% of older adults showed no decline in proprioception, compared with 76.5% of young adults.
03Older adults were more often below cutoff for lower-leg muscle spindles: 25.0% at low frequency and 20.0% at high frequency, versus 9.9% and 8.6% in young adults.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
This was an observational group comparison, not a treatment study, so it cannot show that the measured decline causes falls or that any intervention would help. The young adults came from a previously published study rather than being recruited at the same time, so differences in testing conditions may affect comparison. The older adults had to stand without assistance and many conditions were excluded, including balance, neurological, vestibular, spinal, and pain problems, so the results do not apply to frailer or medically complex patients. The study did not assess the impact of proprioceptive decline on daily function, falls, or rehabilitation outcomes. The percentages of people below cutoff can overlap, so they are not mutually exclusive diagnostic categories. The cutoff was based on young healthy adults, and the study did not show that it identifies an individual patient's risk.
Declared interests
The paper states no commercial benefits and no conflict of interest.
The easy way to misread this
Do not read these percentages as a validated diagnostic cutoff for an individual patient or as proof of fall risk. The study compared group results with a previous young adult sample, excluded many balance and neurological conditions, and did not test outcomes.