Gait adaptations on a treadmill in the moderate exercise intensity domain - Comparison between older adults with and without a history of falls.

Older adults with a history of falls showed significantly shorter steps across all exercise intervals compared to those without a fall history.

• A total of 87 participants were included, of whom 44 had experienced a fall event within the past 12 months or a severe fall within the past five years resulting in hospitalization or a fracture.
• The difference in step length between groups was statistically significant (p = 0.007).
• The most pronounced differences were observed during PWS Recovery (5.7 cm) and Start VT1 (5.3 cm).
• Seven distinct intervals were selected for analysis under successive exercise conditions including preferred walking speed (PWS), 50% PWS, and different intervals of a six-minute walking trial at the first ventilatory threshold (VT1).

Older adults with a history of falls took wider steps on average compared to those without a fall history, though this difference did not reach statistical significance.

• The step width difference between groups showed a trend toward significance (p = 0.083).
• This finding was observed across all exercise intervals.
• The wider steps in the fall history group may reflect a compensatory gait adaptation associated with balance concerns.

There was no interaction effect between exercise interval and group for any of the spatiotemporal gait parameters.

• Analyses of variance were conducted to compare spatiotemporal gait parameters between groups (with/without fall history) and across the seven intervals.
• The absence of an interaction effect indicates that differences in gait parameters between groups did not become more pronounced throughout the exercise intervals.
• This finding contrasts with the study's initial aim of determining if differences become more pronounced throughout an interval at moderate exercise intensity.

Step length differences between fallers and non-fallers were most pronounced at the beginning of VT1 exercise and following VT1 exertion during recovery at PWS.

• The Start VT1 interval (first of three consecutive phases of a six-minute walking sequence at VT1) showed a group difference of 5.3 cm in step length.
• The PWS Recovery interval (PWS following exertion up to VT1) showed the largest group difference of 5.7 cm in step length.
• These two conditions—transitioning into moderate intensity exercise and recovering from it—represented the most discriminating intervals for fall history classification.

The study recruited community-dwelling, physically fit older adults and assessed gait during a structured treadmill protocol spanning multiple exercise intensity conditions.

• 87 participants total were included in the study.
• Spatiotemporal gait parameters were recorded on a treadmill during preferred walking speed (PWS), 50% PWS, and at different intervals of a six-minute walking trial at the first ventilatory threshold (VT1).
• Seven distinct intervals were selected for analysis under successive exercise conditions.
• Fall history was defined as a fall event within the past 12 months or a severe fall within the past five years resulting in hospitalization or a fracture.

Gait adaptations at moderate exercise intensities, especially at VT1, are identified as potentially relevant targets for preventive interventions in older adults.

• Step length is proposed to represent 'a situational gait characteristic associated with fall history and elevated fall-related concerns, particularly under moderate exercise conditions.'
• The authors suggest that gait adaptations at moderate intensities may reflect compensatory strategies in individuals with elevated fall risk.
• The findings point to VT1-level exercise as a clinically meaningful context for evaluating fall-related gait characteristics in older adults.