A comparison of subtalar joint maximal eversion while jogging on the minitrampoline and floor

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Medicine

Background:

• Minitrampolines are popular for exercise and rehabilitation, often cited for reducing lower extremity stress.
• The deformable surface of minitrampolines may alter lower extremity biomechanics, specifically subtalar joint motion.

Purpose of the Study:

• To investigate and compare subtalar joint eversion during jogging on a minitrampoline versus a standard wooden floor.
• To determine the effect of prolonged jogging on subtalar joint eversion across different surfaces.

Main Methods:

• Utilized a flexible electrogoniometer (elgon) to measure subtalar joint eversion in participants jogging on two surfaces.
• Collected data on average maximal eversion for five steps in an initial experiment (N=27).
• Conducted a second experiment with 20 participants over 20 minutes, alternating between surfaces to assess time-dependent effects.

Main Results:

• Significantly greater mean maximal subtalar joint eversion angles were observed when jogging on the minitrampoline compared to the floor in both experiments.
• Prolonged jogging on the minitrampoline led to increased eversion angles over time.
• A significant interaction was found between jogging condition (minitrampoline vs. floor) and time, indicating a time-dependent increase in eversion on the minitrampoline.

Conclusions:

• Jogging on a minitrampoline induces greater subtalar joint eversion than jogging on a solid floor.
• Individuals with contraindications for valgus deviations of the lower leg should exercise caution or avoid jogging on minitrampolines due to increased eversion.
• The findings highlight potential risks associated with minitrampoline use for specific populations regarding lower limb alignment.