Upper extremity muscle activity and joint loading changes between the standard and powerlifting bench press...

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Performance

Background:

• The bench press is a fundamental exercise for strength training.
• Powerlifters utilize specialized techniques to maximize lifting capacity.
• Understanding technique-specific muscle activation and joint loading is crucial for performance optimization and injury prevention.

Purpose of the Study:

• To compare muscle activation and joint loading between the powerlifting (Arch) technique and the standardized bench press technique.
• To investigate how different percentages of one-rep maximum affect these biomechanical parameters.
• To determine the potential benefits of the Arch technique for enhancing muscle output and reducing joint stress.

Main Methods:

• Twenty experienced male powerlifters performed bench press lifts at 25%, 50%, and 75% of their one-rep maximum.
• Electromyography was used to measure muscle activation, specifically the latissimus dorsi.
• Joint moments, particularly at the shoulder, were calculated to assess joint loading.
• Data was collected for both the Arch technique and the National Strength and Conditioning Association (NSCA) standard technique.

Main Results:

• The Arch technique significantly increased latissimus dorsi mean and peak activation (p < 0.0001) by approximately 13% maximal voluntary contraction.
• This increased activation was consistent across all tested percentages of one-rep maximum.
• The standardized technique resulted in significantly larger integrated shoulder moments (p < 0.0001), approximately 8% greater.
• The Arch technique demonstrated decreased shoulder loading compared to the standardized technique.

Conclusions:

• The Arch technique enhances latissimus dorsi activation without increasing overall shoulder loading.
• This technique may help minimize time in the critical
• sticking region
• of the lift, potentially improving performance.
• Findings suggest the Arch technique can be applied in performance and rehabilitation settings to increase muscular output while managing joint stress.