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The characteristics of preferred low-back motion.
D R McIntyre1, L H Glover, R H Seeds
1Isotechnologies, Inc., Hillsborough, North Carolina 27278.
Journal of Spinal Disorders
|June 1, 1990
Summary
Increased resistance during low-back motion exercises significantly impacts movement speed and range. Higher loads reduce movement velocities and joint excursions, leading to greater variability in motion parameters.
Area of Science:
- Biomechanics
- Human Movement Science
- Spinal Kinematics
Background:
- Understanding the effects of external loads on spinal motion is crucial for rehabilitation and training.
- Preferred movement patterns are essential for safe and effective physical activity.
Purpose of the Study:
- To investigate how varying loads affect preferred low-back motion.
- To assess the consistency of preferred low-back motion under different resistance levels.
Main Methods:
- Fifteen healthy volunteers performed repeated flexion-extension movements.
- Loads ranged from 0% to 75% of maximum isometric flexion torque.
- Movement velocity, range of motion, and variability were analyzed.
Main Results:
- Loads above 25% resistance decreased movement velocities and cycle excursions.
- Reductions in extension endpoints contributed to decreased range of motion.
- Increased resistance led to greater variability in motion parameters, especially later in trials.
Conclusions:
- External loading significantly alters preferred low-back kinematics.
- Movement consistency decreases with increasing resistance levels.
- These findings have implications for designing exercise protocols and understanding injury mechanisms.