Effect of Load on Muscle Activity, Kinematics, and Force Production During the Reverse Hyperextension Exercise

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• The reverse hyperextension exercise is a valuable tool for strengthening the posterior chain musculature.
• It is designed to avoid axial loading of the spine, making it suitable for individuals with spinal concerns.
• However, there is a lack of established guidelines regarding optimal loading parameters for this exercise.

Purpose of the Study:

• To investigate the effects of varying external loads on muscle activation and biomechanics during the reverse hyperextension exercise.
• To determine if increasing loads beyond a certain threshold provides additional benefits for posterior chain engagement.
• To provide evidence-based recommendations for loading the reverse hyperextension exercise.

Main Methods:

• Twenty recreationally active participants (13 males, 7 females) performed the reverse hyperextension exercise with 50%, 100%, and 150% of their bodyweight.
• Surface electromyography (sEMG) was used to measure the activity of the erector spinae, gluteus maximus, and biceps femoris muscles.
• Motion tracking analyzed trunk, lower extremity, and exercise pendulum kinematics.
• A one-way repeated-measures ANOVA was employed to analyze the collected data.

Main Results:

• Heavier loads (100% and 150% bodyweight) resulted in significantly greater hip and trunk flexion compared to the 50% bodyweight load.
• Erector spinae and gluteus maximus muscle activity increased with higher loads (100% and 150% bodyweight) compared to the 50% load.
• Biceps femoris activation demonstrated a positive correlation with increasing load.
• Peak force significantly increased with 100% and 150% loads compared to the 50% load, but differences between 100% and 150% were minimal.

Conclusions:

• The reverse hyperextension exercise effectively engages posterior chain musculature.
• Increasing the load to 100% or 150% of bodyweight enhances muscle activation and force production compared to 50% bodyweight.
• However, the benefits of increasing the load beyond 100% bodyweight appear to plateau, suggesting 100% bodyweight may be a near-optimal load for this exercise.