Exercise Bouts at Three Different Intensities Fail to Potentiate Concentric Power

Area of Science:

• Exercise Physiology
• Sports Science
• Biomechanics

Background:

• Postactivation potentiation (PAP) is a phenomenon where a brief period of high-intensity exercise enhances subsequent muscular performance.
• Previous research hypothesized PAP occurs during voluntary, concentric muscle actions.

Purpose of the Study:

• To investigate if conditioning exercise intensities could evoke potentiation of power during the bench press throw (BPT).
• To determine the effect of different conditioning exercise intensities on power production and muscle activation.

Main Methods:

• Twelve men performed conditioning presses at 55%, 70%, and 86% of their 1-repetition maximum (1RM).
• Average and peak power of the BPT (using 55% 1RM load) and triceps brachii surface electromyography (EMG) were measured before and after conditioning.
• Data were analyzed using two-way repeated measures analyses of variance.

Main Results:

• A significant decrease in both average power (-18.6 W) and peak power (-37.4 W) was observed across all conditioning intensities.
• No significant changes or interactions were found in the EMG data of the triceps brachii.

Conclusions:

• Conditioning exercise at the tested intensities did not induce postactivation potentiation for the bench press throw.
• The findings contradict the hypothesis that PAP can be evoked during voluntary concentric actions with these specific protocols.