Multiple-joint velocity-spectrum strength/power development consequent to repetition manipulation

Area of Science:

• Exercise Physiology
• Sports Science
• Biomechanics

Background:

• Traditional weight training uses various repetition strategies, with strength often measured by one-repetition maximum (1 RM).
• Isokinetic assessments offer velocity-controlled measurements, potentially better reflecting real-life activities.
• This study investigates how different repetition schemes affect isokinetic performance.

Purpose of the Study:

• To assess the effects of varied repetition schemes in heavy-resistance training on multiple-joint isokinetic performance.
• To compare strength and power changes across different velocities.
• To determine optimal repetition ranges for strength and power development.

Main Methods:

• 48 untrained young men participated in 12 weeks of variable-resistance training.
• Training programs included 3 sets of 3-4 RM, 9-10 RM, or 15-16 RM.
• Isokinetic strength and power were measured pre- and post-training at various velocities for squat and bench press exercises.

Main Results:

• Strength improvements were significant only at the slowest velocities for both squat and bench press.
• Power improvements were significant across all tested velocities for squats and most velocities for bench press.
• Repetition schemes involving 10 RM or fewer per set showed greater power increases.

Conclusions:

• Heavy resistance training with up to 10 RM per set enhances power across a spectrum of velocities in untrained young men.
• Strength gains appear limited to slower movement velocities with this training approach.
• Variable-resistance training with different repetition schemes yields mixed results for force but notable power improvements.