Learning spinal manipulation: Gender and expertise differences in biomechanical parameters, accuracy, and...

Area of Science:

• Biomechanics
• Motor Learning
• Chiropractic Education

Background:

• Spinal manipulation is a key skill in chiropractic and osteopathic medicine.
• Understanding factors influencing performance, such as gender and expertise, is crucial for effective training.

Purpose of the Study:

• To investigate gender and expertise differences in biomechanical parameters and force accuracy during spinal manipulation learning.
• To identify potential gender-specific motor strategies in performing thoracic spine manipulations.

Main Methods:

• 137 fourth- and fifth-year students performed 5 thoracic spine manipulations with a target force of 450 N.
• Biomechanical parameters (preload, time to peak force, peak force, rate of force) and force error (constant, variable, absolute) were measured.
• Two-way ANOVA was used to assess gender and expertise effects.

Main Results:

• Significant gender differences were observed in biomechanical parameters, accuracy, and variability.
• Women exhibited lower time to peak force and rate of force but superior precision and less variability compared to men.
• Fifth-year students (higher expertise) applied less force and demonstrated greater precision.

Conclusions:

• Gender influences spinal manipulation performance, likely due to differing motor strategies.
• Expertise also plays a role, with advanced students showing more refined force control.
• Future research should explore the underlying reasons for these gender-based differences to inform pedagogical approaches.