Age has no effect on ankle proprioception when movement history is controlled

Area of Science:

• Neuroscience
• Gerontology
• Biomechanics

Background:

• Ankle proprioceptive deficits are linked to increased fall risk in the elderly.
• Previous research on age-related changes in proprioception has yielded conflicting results.
• The influence of prior muscle contractions and length changes on proprioception has not been fully considered in aging studies.

Purpose of the Study:

• To investigate whether ankle proprioception changes with age in healthy individuals.
• To assess the effect of age on the threshold for detection of passive movement, proprioceptive reaction time, and joint position sense.
• To control for muscle spindle sensitivity by managing previous muscle contractions and length changes.

Main Methods:

• Eighty healthy participants aged 19-80 years were recruited.
• Three ankle proprioception tests were administered: passive movement detection threshold, reaction time, and joint position matching.
• Muscle spindle sensitivity was standardized by repetitive ankle movements before each test to control for thixotropy.

Main Results:

• Linear regression analysis revealed no significant effect of age on proprioceptive acuity.
• Detection thresholds (0.13 ± 0.10°), reaction times (0.251 ± 0.054 s), and joint position sense measures (intercept, slope, R²) were not associated with age.
• The reliability of the testing methods was found to be good to excellent.

Conclusions:

• Contrary to some expectations, this study found little evidence of age-related decline in ankle proprioception in healthy, community-dwelling adults under controlled laboratory conditions.
• The findings suggest that factors other than age alone may contribute to proprioceptive impairments in older adults, particularly those at risk of falling.
• Further research is needed to explore proprioceptive function in older adults with pre-existing functional limitations or a history of falls.