Experience and practice organization in learning a simulated high-velocity low-amplitude task

Area of Science:

• Chiropractic education and biomechanics.
• Motor learning and skill acquisition in healthcare.

Background:

• Effective high-velocity low-amplitude (HVLA) spinal manipulation requires precise force control.
• Understanding how practice schedules and feedback influence skill acquisition in chiropractic students is crucial.

Purpose of the Study:

• To determine the impact of practice schedule (blocked vs. random variable) and feedback type (visual vs. knowledge of performance) on simulated HVLA manipulation force accuracy.
• To assess the influence of experience level on simulated force production.

Main Methods:

• Thirty-three chiropractic students performed simulated HVLA prone thoracic spine manipulations.
• Practices involved blocked and random variable schedules with visual or knowledge of performance feedback.
• Force-time history, peak and average rates of thrust development, and peak force error (constant, absolute, variable) were analyzed.

Main Results:

• Practice and familiarity with HVLA manipulation improved peak force production accuracy.
• Blocked variable practice led to lower acquisition error, while random variable practice enhanced retention accuracy.
• Random variable practice combined with visual feedback yielded the best retention accuracy.

Conclusions:

• Familiarity and practice enhance HVLA manipulation force accuracy.
• Random variable practice, particularly with visual feedback, is superior for retention of accurate force production.
• Optimal force production accuracy and minimal variability occur around 75% of maximum thrusting ability.