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. 2026 Feb 2;17:1644741. doi: 10.3389/fnagi.2025.1644741

Figure 2.

Line graph showing walking speeds, measured in meters per second (m/s), for three groups: Younger (black line), Older HF (blue line), and Older LF (red line) across different incline levels: flat, low, medium, and high. Walking speed decreases as incline increases for all groups. Younger participants consistently have higher speeds compared to the two older groups.

Overground uneven terrain walking speed across four terrain conditions. Data represent the mean ± standard error. The color of the lines represents each group. †Indicates significantly different for the younger group compared to the older groups in all pooled terrains; ‡indicates significantly different between the older groups in all pooled terrains; ⓪ indicates significantly different compared to flat in all pooled groups; and ① indicates significantly different compared to low terrain in all pooled groups. HF refers to high physical function, and LF refers to low physical function.