Jimmy Falk1, Ulrika Aasa2, Lars Berglund3. 1. Department of Health, Education and Technology, Luleå University of Technology, 971 87, Luleå, Sweden. Electronic address: jimmy.falk@ltu.se. 2. Department of Community Medicine and Rehabilitation, Umeå University, 90187, Umeå, Sweden. Electronic address: ulrika.aasa@umu.se. 3. Department of Community Medicine and Rehabilitation, Umeå University, 90187, Umeå, Sweden. Electronic address: lars.berglund@umu.se.
Abstract
OBJECTIVES: To investigate the accuracy of visual assessments made by physical therapists of lumbo-pelvic movements during the squat and deadlift and how much movement is considered injurious. DESIGN: Quantitative Cross-sectional. PARTICIPANTS: 14 powerlifters, 10 Olympic weightlifters and six physical therapists. SETTING: The lifters were recorded simultaneously by video and an inertial measurement unit (IMU) system while performing squats and deadlifts. The physical therapists assessed the videos and rated whether specific lumbo-pelvic movements were visible during the lifts and whether the movement amplitude was considered injurious. MAIN OUTCOME MEASURES: The nominal visual assessments, if there was a movement and if it was considered injurious, were compared to the degrees of movement attained from the IMU system. RESULTS: During the squat, a posterior pelvic tilt of ≥34° was required to visually detect the movement. For other lumbo-pelvic movements, there was no significant difference in the amount of movement between those who were assessed as moving or not moving their lumbo-pelvic area, nor was there a difference in movement amplitude between those who were assessed as having an increased risk of injury or not. CONCLUSIONS: Physical therapists did not consistently detect lumbo-pelvic movements during squats and deadlifts when performed by competitive lifters.
OBJECTIVES: To investigate the accuracy of visual assessments made by physical therapists of lumbo-pelvic movements during the squat and deadlift and how much movement is considered injurious. DESIGN: Quantitative Cross-sectional. PARTICIPANTS: 14 powerlifters, 10 Olympic weightlifters and six physical therapists. SETTING: The lifters were recorded simultaneously by video and an inertial measurement unit (IMU) system while performing squats and deadlifts. The physical therapists assessed the videos and rated whether specific lumbo-pelvic movements were visible during the lifts and whether the movement amplitude was considered injurious. MAIN OUTCOME MEASURES: The nominal visual assessments, if there was a movement and if it was considered injurious, were compared to the degrees of movement attained from the IMU system. RESULTS: During the squat, a posterior pelvic tilt of ≥34° was required to visually detect the movement. For other lumbo-pelvic movements, there was no significant difference in the amount of movement between those who were assessed as moving or not moving their lumbo-pelvic area, nor was there a difference in movement amplitude between those who were assessed as having an increased risk of injury or not. CONCLUSIONS: Physical therapists did not consistently detect lumbo-pelvic movements during squats and deadlifts when performed by competitive lifters.