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The distributions of participant step length (A), height (B), RMS value at maximal knee flexion (C), and RMS value at maximal knee extension (D) by age group (40s, age 40–49 years; 50s, age 50–59 years; 60s, age 60–69 years; 70s, age 70–79 years). * p < 0.05, ** p < 0.01. ns, not significant; RMS, root mean square.
