High-velocity, low-amplitude spinal manipulation (HVLA-SM) may generate different therapeutic effects depending on force and duration characteristics. Variability among clinicians suggests training to target specific thrust duration and force levels is necessary to standardize dosing. This pilot study assessed an HVLA-SM training program using prescribed force and thrust characteristics.
Over 4 weeks, chiropractors and students at a chiropractic college delivered thoracic region HVLA-SM to a prone mannequin in six training sessions, each 30 minutes in duration. Force plates embedded in a treatment table were used to measure force over time. Training goals were 350 and 550 Newtons (N) for peak force and ≤150 ms for thrust duration. Verbal and visual feedback was provided after each training thrust. Assessments included 10 consecutive thrusts for each force target without feedback. Mixed-model regression was used to analyze assessments measured before, immediately following, and 1, 4, and 8 weeks after training.
Error from peak force target, expressed as adjusted mean constant error (standard deviation), went from 107 N (127) at baseline, to 0.2 N (41) immediately after training, and 32 N (53) 8 weeks after training for the 350 N target, and 63 N (148), −6 N (58), and 9 N (87) for the 550 N target. Student median values met thrust duration target, but doctors' were >150 ms immediately after training.
After participation in an HVLA-SM training program, participants more accurately delivered two prescribed peak forces, but accuracy decreased 1 week afterwards. Future HVLA-SM training research should include follow-up of 1 week or more to assess skill retention.
Zacariah Shannon is a postdoctoral research scholar at the Palmer Center for Chiropractic Research, Palmer College of Chiropractic (741 Brady St, Davenport, IA 52803; firstname.lastname@example.org). Robert Vining is an associate professor and Associate Dean of Clinical Research at the Palmer Center for Chiropractic Research, Palmer College of Chiropractic (741 Brady St, Davenport, IA 52803; email@example.com ). Maruti Gudavalli is a professor at Keiser University College of Chiropractic Medicine (2081 Vista Parkway, West Palm Beach, FL 33411; firstname.lastname@example.org ). Ron Boesch is the Executive Dean of Clinic in the Department of Clinical Affairs at Palmer College of Chiropractic (1000 Brady Street, Davenport IA 52803; Ron.email@example.com). Address correspondence to Zacariah Shannon, 741 Brady St, Davenport, IA 52803; firstname.lastname@example.org. This article was received June 28, 2018, revised October 18, 2018, and accepted November 20, 2018.
Concept development: ZS, RV, MG. Design: ZS, RV, MG. Supervision: ZS, RV, MG. Data collection/processing: ZS, MG. Analysis/interpretation: ZS, MG. Literature search: ZS, RZ. Writing: ZS, RV. Critical review: ZS, RV, MG, RB. Mentoring: RV, MG, RB.