Functional Stratification Reveals Speed-Independent Gait Impairments Beyond Chronological Age

Area of Science:

• Gerontology
• Biomechanics
• Neurology

Background:

• Gait analysis is crucial for assessing functional decline in aging populations.
• Chronological age classification may miss early impairments detectable by gait kinematic profiling.
• Functional age stratification can enhance sensitivity to subtle gait abnormalities.

Purpose of the Study:

• To investigate if stratifying older adults by functional status (using SPPB) improves detection of gait abnormalities.
• To identify instability-related compensatory gait patterns in older adults.
• To compare gait parameters between young, high-functioning, and low-functioning older adults.

Main Methods:

• 190 adults underwent gait trials on a pressure-sensitive walkway.
• 28 spatial, temporal, and variability gait parameters were analyzed.
• Participants were stratified by age and functional status (SPPB), with ANCOVA adjusting for walking speed.

Main Results:

• Low-functioning older adults showed longer stance/double-support, wider steps, and greater variability compared to high-functioning and young groups, even after speed adjustment.
• These findings suggest an instability-driven compensatory gait strategy, not just slower walking.
• High-functioning older adults' gait resembled that of younger adults.

Conclusions:

• Functional classification via SPPB is more sensitive than chronological age for detecting early mobility decline.
• Gait variability is a significant biomarker for impaired neuromuscular control.
• Combining gait profiling with functional assessments can enhance early screening, intervention, and fall prevention.