Potentiating Effects of Accentuated Eccentric Loading Are Dependent Upon Relative Strength

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanics

Background:

• Accentuated eccentric loading (AEL) is a training method that increases the eccentric overload during resistance exercises.
• The effectiveness of AEL in enhancing performance, particularly bench press velocity, is debated and may depend on individual strength levels.

Purpose of the Study:

• To investigate the acute effects of AEL on bench press velocity.
• To assess the impact of AEL on perceived exertion and muscle soreness.
• To determine if relative strength influences the effects of AEL.

Main Methods:

• Ten resistance-trained participants (8 men, 2 women) performed bench presses with AEL and traditional loading (TL) at 50% and 65% of 1-repetition maximum (1RM).
• Eccentric loads for AEL were 120% of the concentric load for the first repetition.
• Hierarchical Linear Modeling was used to analyze differences in velocity, perceived exertion (RPE), and soreness between AEL and TL protocols.

Main Results:

• AEL resulted in slower initial eccentric and concentric velocities compared to TL at both 50% and 65% 1RM.
• The velocity slope across repetitions was steeper with AEL than TL.
• Stronger individuals demonstrated faster concentric velocities with AEL compared to TL at 50% and 65% 1RM.
• No significant differences in RPE or soreness were observed between AEL and TL protocols.

Conclusions:

• Current AEL protocols do not appear to increase concentric velocity during the bench press for the general population.
• Stronger individuals may experience enhanced concentric velocity with AEL, possibly due to altered eccentric phase pacing.
• Increased eccentric intensity with AEL did not lead to greater RPE or soreness.