Flat versus Simulated Mountain Trail Running: A Multidisciplinary Comparison in Well-Trained Runners

Area of Science:

• Exercise Physiology
• Biomechanics
• Sports Science

Background:

• Running performance is influenced by surface variations.
• Understanding neuromuscular responses to different running surfaces is crucial for training optimization.
• Trail running presents unique challenges compared to flat surface running.

Purpose of the Study:

• To compare cardiopulmonary and neuromuscular parameters during running on flat versus unpredictable surfaces.
• To investigate the effects of varied terrain on muscle activation patterns in well-trained runners.
• To provide insights into training strategies for natural running environments.

Main Methods:

• Twenty well-trained male runners completed running protocols on a treadmill under flat (FC) and unpredictable roll variation (URV) conditions.
• Cardiopulmonary measures (V˙O2, BLa-, HR), cadence, ground contact time, and RPE were assessed.
• Surface electromyography (sEMG) of lower limb muscles was recorded to analyze activation amplitude, width, and variability.

Main Results:

• No significant differences were found in cardiopulmonary parameters or peak sEMG amplitude/width between FC and URV conditions.
• The variability of sEMG peak amplitude and width was significantly higher in the URV condition compared to FC.
• This indicates increased neuromuscular adaptation and control demands on unpredictable surfaces.

Conclusions:

• While overall aerobic demand is similar, unpredictable running surfaces significantly increase neuromuscular variability.
• Coaches should incorporate varied, non-traditional surfaces into training to mimic natural running environments.
• Further research is needed to explore the physiological effects and injury prevention benefits of surface-specific training.