Reliability of COP Measures in Healthy and Low Back Pain Subjects During a Dynamic Task
Journal Title: Ergonomics International Journal - Year 2017, Vol 1, Issue 5
Abstract
Study design. A test–retest design. Objectives: To study the reliability of the postural stability measures during whole body dynamic conditions in healthy and low back pain (LBP) subjects. Summary of Background Data: Postural control is an essential prerequisite for dynamic motions such as lifting, lowering, and repetitive trunk bending tasks. Test retest reliability of center of pressure (COP) measures is well documented in static conditions but such results may not be applicable to dynamic conditions. To the authors knowledge this has not been investigated in dynamic conditions. Methods: Twenty four subjects (12 healthy and 12 LBP) performed repeated trunk bending in two different conditions of high and low speed in sagittal plane. All measurements were repeated and recorded with an interval of 7-10 days later. COP data were used to calculate standard deviation of amplitude, standard deviation of velocity in anterior-posterior and medial-lateral directions, mean total velocity and path length. Relative reliability was assessed using intra class correlation coefficient (ICC) and absolute reliability using standard error of measurement (SEM), minimum detectable change (MMDC) and coefficient of variation (CV). Results: Results in both groups revealed that mean total velocity and standard deviation of amplitude in anterior-posterior direction have an acceptable good to an excellent reliability with ICC range of 0.61-0.89. In healthy group the rest of others parameters also demonstrated an acceptable good to excellent reliability (range 0.6-0.97). In LBP subjects, in addition to standard deviation of amplitude in anterior posterior direction and mean total velocity, standard deviation of velocity in A-P in high pace condition also showed good reliability (ICC=0.69). Conclusion: Mean total velocity and standard deviation of amplitude in anterior-posterior direction are suggested as a good reliable parameter to use for evaluation postural stability in dynamic situations such as lifting and complex trunk movement.
Authors and Affiliations
Mokhtarinia HR
Keywords
Related Articles
- EP ID EP486785
- DOI 10.23880/eoij-16000129
- Views 84
- Downloads 0
Air Distribution from an Ergonomic Prospective-Delivering Air to People or to Rooms?
Conventional total-volume ventilation theory treats the air in a room as well-mixed. Therefore, to limit the concentrations of contaminants generated in a room, fresh air must be supplied to the room to dilute the contam...
Human Reliability Analysis from the Ergonomics Perspective: Towards a Systemic Approach
The evolution of socio-economic environment during the 20th century caused a rapid increase in two important issues: the risk and the complexity of the processes [1]. These two factors combined with several numbers of te...
Reliability of COP Measures in Healthy and Low Back Pain Subjects During a Dynamic Task
Study design. A test–retest design. Objectives: To study the reliability of the postural stability measures during whole body dynamic conditions in healthy and low back pain (LBP) subjects. Summary of Background Data: P...
Monitoring Thermal Stress of Steel Re-Rolling Mill Workers
Monitoring heart rates using portable sport tester, this study investigated thermal stress as an important parameter of measuring physical effort of steel re-rolling mill workers. In all, 34 adult male subjects (age: 36...
Positive Sum Design: Designing Affordances for Bias, Choice and Coordination
In my previous introduction to Positive Sum Design, I explore the limits that zero sum bias places on our ability to solve problems creatively.