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The contribution of counter-rotation movements during fall recovery: A validation study. | LitMetric

AI Article Synopsis

  • - The study investigates how three mechanisms (moving the COP within support, segment counter-rotation, and applying external force) help maintain standing stability during falls, with a focus on the role of arm movement.
  • - Researchers tested the effects of arm motion constraints on recovery from treadmill-induced falls, finding that limiting arm movement reduced counter-rotation for anterior falls but increased it for posterior falls.
  • - Overall, the findings suggest that arm motion is more important in fall recovery than the movement of the center of pressure, particularly during backward falls, as unimpaired individuals don't heavily rely on arm motions for recovery when falling forward.

Article Abstract

Three mechanisms of maintaining standing stability include M - moving the COP within the base of support, M - segment counter-rotation, and M - applying an external force. To date, the contributions of these mechanisms have not been quantified for the response to an external postural disturbance. The purpose of this study was to evaluate the construct validity of measures that quantify the M contribution to anteroposterior fall recovery. We evaluated the whole-body rotation contribution, as well as a measure specific to arm motion (M). With segment counter-rotation as the main focus of this study, we examined standing feet-in-place responses to treadmill-induced falls. The treatment validity of our measures was assessed by comparing unconstrained responses to those with constrained arm motion. The convergent validity of our measures was assessed by correlating peak shoulder flexion and extension velocities with counter-rotation contributions. Eleven unimpaired participants responded to anteroposterior belt accelerations from a treadmill, and the M and M contributions were quantified from three-dimensional segment motion. The treatment validity of these measures was partially supported. Constraining the arms reduced M for anterior, but not posterior falls. Conversely, M was reduced for posterior, but not anterior falls. Convergent validity was supported for M (r = 0.64-0.78), but not M (r = -0.40 to -0.15). These results support the use of M over M when interested in the role of arm motion. Given that arm constraints did not change the contribution of M during a forward fall, unimpaired participants may not necessarily rely on arm motion as part of their recovery strategy in this context.

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Source
http://dx.doi.org/10.1016/j.jbiomech.2018.07.025DOI Listing

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