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Ground Reaction Forces in Running: A Reexamination

Ground Reaction Forces in Running: A Reexamination. C F Munro, D I Miller & A J Fuglevand. Methods. 20 male subjects ran at speeds 2.5 – 5.5 m/s Kistler force plate interfaced to PDP 11/34 computer 1000 Hz Photocells positioned 5 m apart to monitor average velocity

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Ground Reaction Forces in Running: A Reexamination

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  1. Ground Reaction Forces in Running: A Reexamination C F Munro, D I Miller & A J Fuglevand

  2. Methods • 20 male subjects ran at speeds 2.5 – 5.5 m/s • Kistler force plate interfaced to PDP 11/34 computer 1000 Hz • Photocells positioned 5 m apart to monitor average velocity • Subjects wore their own shoes • Trials where the change in Vy was greater than ± .10 m/s were rejected (Ant/Pos force was integrated) • Stance time was defined as Fz > 16 N • Loading rate was defined as the time to from 50 N to BW + 50 N • Decay rate was defined as the time from BW + 50 N to 50 N following Thrust Max • Impulses and Forces were normalized by dividing by body weight in Newtons • Right and Left foot trials were averaged

  3. Loading Rate Calculation

  4. Anterior – Posterior Force Curves Increasing running speed increases the magnitude of A/P forces and decreases stance time.

  5. Variability in Braking Patterns Rearfoot have a single peak braking pattern. Midfoot runners have two or more peaks during braking.

  6. Vertical GRF as a function of running speed • Increasing running speed: • Increases impact • Increases loading rate • Increases thrust max • Decreases stance time

  7. Medial – Lateral Force Curves Stance time decreases and magnitude of peaks increases with increasing running speed.

  8. Impulse Braking and Propulsion increases with increasing running speed.

  9. Vertical Force Variables as a Function of Running Speed

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