An investigation into the relation between step height and ground reaction forces in step exercise: a pilot study

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• Step aerobics is a popular exercise modality.
• Understanding biomechanical forces is crucial for injury prevention in step aerobics.
• Previous research suggests lower step heights may be safer.

Purpose of the Study:

• To investigate the impact of varying step heights on ground reaction forces during step aerobics.
• To determine if different step heights influence peak impact force, time to peak impact, and foot contact duration.
• To provide evidence-based recommendations for safe step height selection in aerobics.

Main Methods:

• A randomized crossover design was employed with 12 novice participants.
• Participants performed a basic step at 120 beats/min on 6, 8, and 10-inch step heights.
• Ground reaction forces were measured, analyzing peak impact force, time to peak impact, foot contact time, and force impulse.

Main Results:

• A statistically significant difference in peak impact force was observed between the 6-inch and 8-inch conditions, and between the 6-inch and 10-inch conditions.
• No significant differences in peak impact force were found between the 8-inch and 10-inch conditions.
• No significant differences were found for time to peak impact, total foot contact time, or force impulse across the tested step heights.

Conclusions:

• The findings support current recommendations for using lower step heights in aerobics to minimize impact forces.
• Higher step heights (8 and 10 inches) do not significantly increase impact forces compared to each other, but both are higher than 6 inches.
• Reducing peak impact forces through appropriate step height selection may mitigate injury risk in step aerobics.