Effect of Intention to Squat Explosively on Acute Countermovement Jump Performance

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• The countermovement jump (CMJ) is a key measure of explosive power in athletes.
• Potentiation strategies aim to enhance subsequent athletic performance.
• The effect of explosive intent during a conditioning activity on CMJ is not fully understood.

Purpose of the Study:

• To investigate if squatting with the intention to move the bar explosively during the ascent phase potentiates countermovement jump (CMJ) performance.
• To compare the effects of a controlled versus an explosive intent half-squat conditioning activity on CMJ outcomes.

Main Methods:

• Fourteen recreationally trained men performed a half-squat conditioning activity (CA) with either a controlled (CON) or explosive intent (VMAX) using a 5RM load.
• CMJ performance was assessed before and at 4 and 8 minutes after each CA condition.
• Measures included half-squat force, power, velocity, RFD, and CMJ height, power, velocity, and force.

Main Results:

• The VMAX condition significantly increased half-squat peak power, peak velocity, and maximum rate of force development (RFD) compared to CON.
• Neither the CON nor the VMAX conditioning activity resulted in significant improvements in any measured post-CMJ performance variable.
• Individual analysis revealed some small increases in jump height after the VMAX condition.

Conclusions:

• An explosive intent half-squat conditioning activity does not significantly enhance overall countermovement jump performance in recreationally trained men.
• The observed individual improvements suggest that explosive intent may potentiate CMJ performance in specific athletes.
• Further research is needed to identify the characteristics of individuals who may benefit from explosive intent conditioning activities.