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Training can modify back muscle response to sudden trunk loading
Mogens Theisen Pedersen1, Morten Essendrop, Jørgen H Skotte
1Institute of Exercise and Sport Sciences, University of Copenhagen, Nørre allé 51, 2200 N Copenhagen, Denmark. mtpedersen@ifi.ku.dk.
Summary
Readiness training improved responses to sudden trunk loading in healthy individuals, reducing the time to stop unexpected forces. This suggests a potential method for decreasing low-back injury risk in occupational settings.
Area of Science:
- Occupational Health
- Biomechanics
- Exercise Physiology
Background:
- Sudden, unexpected trunk loading is a known risk factor for low-back disorders.
- Previous research has not extensively explored methods to improve the body's response to such loading events.
Purpose of the Study:
- To investigate the impact of "readiness training" on the neuromuscular response to sudden trunk loading in healthy, untrained individuals.
- To determine if this training can enhance protective responses without increasing trunk stiffness.
Main Methods:
- Nineteen healthy participants underwent a 4-week readiness training program (10 sessions) focusing on reactions to sudden trunk perturbations.
- A control group of 19 matched individuals did not receive training.
- Both groups were tested before and after the training period using a standardized sudden trunk loading (SL) test, measuring reaction and electromyography (EMG) responses.
Main Results:
- The training group showed a significant decrease in the time to stop sudden trunk loading (from 337 ms to 311 ms) compared to the control group.
- EMG signal analysis revealed changes in the early response phase (up to 225 ms) after training, without altering EMG onset latency.
- Improved stopping time was achieved without a significant increase in pre-activation or trunk stiffness.
Conclusions:
- Readiness training can effectively improve the neuromuscular response to sudden trunk loading in healthy individuals.
- This training-induced enhancement of protective responses may offer a novel strategy for reducing the risk of low-back injuries, particularly in occupations with frequent sudden trunk perturbations.