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Context:

Form skipping has been used to help injured athletes progress to running. Because little research has been done on form-skipping mechanics, its justification as a progression to running exercises is unclear.

Objective:

To compare ground-reaction forces (GRF) during form skipping and running in healthy subjects at clinically relevant speeds, 1.75 m/s and 3.83 m/s, respectively.

Design:

Dependent t tests (α = .05).

Setting:

Sports-injury research center.

Participants:

9 male college athletes (age 20 ± 1.33 years, mass 848.4 ± 43.24 N, height 1.80 ± 0.07 m).

Main Outcome Measures:

Average (Fzavg) and maximum (Fzmax) vertical GRF and (Fy) braking impulse were compared.

Results:

Fzavg and Fzmax were greater during running than during form skipping (P < .05). Braking impulses were not different (P > .05).

Conclusions:

It appears that Fz, but not the Fy, GRF might explain why form skipping might be an appropriate progression to running.

Johnson, Golden, and Hoffman are with the Dept of Exercise and Sport Science, Oregon State University, Corvallis, OR 97331. Mercer and Mangus are with the Dept of Kinesiology, University of Nevada, Las Vegas, NV 89154.