The effect of body weight reduction using a lower body positive pressure treadmill on plantar pressure measures while running.

OBJECTIVE

To evaluate the effects of body weight reduction at 10% intervals on pressure distribution variables across regions of the foot while running.

STUDY DESIGN

Crossover Study Design.

SETTING

Laboratory.

PARTICIPANTS

12 recreational runners.

MAIN OUTCOME MEASURES

Pressure-time integral, peak pressure, instance of peak pressure, contact area, contact time and center of pressure (COP) location at initial contact across four foot regions were measured while participants ran at self-selected speed on the Lower Body Positive Pressure Treadmill (LBPPT) at 100%, 90%, 80%, 70% and 60% of their body weight (%BW).

RESULTS

As the %BW decreased, there were corresponding significant decreases in the pressure-time integral and peak pressures in all four regions of the foot. Significant differences within foot region and %BW for the other variables were infrequent. There was a significant anterior shift of the COP location at initial contact as the %BW decreased.

CONCLUSION

LBPPT is useful for reducing the pressure across the entire foot. Additionally, the anterior translation of the COP location at initial contact with reduced %BW may provide an additional gait retraining tool for prevention and treatment of running injuries as reducing %BW moves the runner away from a rearfoot strike pattern.