Effects of various isoresistive training programmes on trunk muscle performance

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• Isoresistive exercise is a method for assessing and improving muscle performance.
• Resistance is typically set as a percentage of an individual's maximal isometric torque.
• Trunk muscle performance is crucial for daily activities and potentially preventing low back pain (LBP).

Purpose of the Study:

• To compare the effectiveness of dynamic isoresistive exercise at varying intensities (25%, 50%, 75% of maximal isometric flexion torque) against static isometric exercise.
• To determine the optimal isoresistive protocol for enhancing trunk flexor and extensor muscle performance.

Main Methods:

• 42 healthy females (18-25 years) were randomly assigned to control or dynamic isoresistive exercise groups.
• Exercise groups performed 2 minutes of exercise three times per week.
• Training protocols involved different percentages of maximal isometric flexion torque or static isometric exercise.

Main Results:

• The 50% maximal isometric flexion torque group demonstrated the most significant improvements in most muscle performance measures.
• Maximal isometric torques for flexion and extension did not show significant changes across any groups.
• Improvements were most notable in trunk flexion and extension velocity and power.

Conclusions:

• Dynamic isoresistive exercise at 50% of maximal isometric flexion torque appears most effective for enhancing trunk muscle velocity and power.
• While maximal strength did not significantly increase, improvements in muscle power and velocity suggest functional gains.
• This study provides evidence for an effective isoresistive protocol for trunk muscle conditioning, potentially aiding in LBP prevention.