1. Directional specificity of postural threat on anticipatory postural adjustments during lateral leg raising
- Author
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Thierry Gélat, Eric Yiou, Thomas Deroche, Manon Gendre, Jean Louis Honeine, Complexité, Innovation, Activités Motrices et Sportives (CIAMS), Université Paris-Sud - Paris 11 (UP11)-Université d'Orléans (UO), Centre de Recherche sur le Sport et le Mouvement (CeRSM), and Université Paris Nanterre (UPN)
- Subjects
Adult ,Male ,medicine.medical_specialty ,Adolescent ,[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging ,Movement ,medicine.medical_treatment ,Analyse du Mouvement en Biomécanique Physiologie et Imagerie ,Fear of falling ,050105 experimental psychology ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Physical medicine and rehabilitation ,[SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO] ,medicine ,Humans ,0501 psychology and cognitive sciences ,[PHYS.MECA.BIOM]Physics [physics]/Mechanics [physics]/Biomechanics [physics.med-ph] ,Postural Balance ,Reduction (orthopedic surgery) ,Leg ,General Neuroscience ,05 social sciences ,Motor control ,Anticipation, Psychological ,Postural stability ,Female ,medicine.symptom ,Psychology ,Social psychology ,Psychomotor Performance ,030217 neurology & neurosurgery - Abstract
Epub 2015 Oct 26. Erratum in: Exp Brain Res. 2016 Apr.; This study explored the directional specificity of fear of falling (FoF) effects on the stabilizing function of anticipatory postural adjustments (APA). Participants (N = 71) performed a series of lateral leg raises from an elevated surface in three conditions: in the "Control condition", participants stood at the middle of the surface; in the two test conditions, participants were positioned at the lateral edge of the surface so that the shift of the whole-body centre-of-mass during APA for leg raising was directed towards the edge ("Approach condition") or was directed away from the edge ("Avoidance condition"). Results showed that the amplitude of APA was lower in the "Approach condition" than in the "Control condition" (p < .01); this reduction was compensated for by an increase in APA duration (p < .05), so that both postural stability and motor performance (in terms of peak leg velocity, final leg posture and movement duration) remained unchanged. These changes in APA parameters were not present in the "Avoidance condition". Participants further self-reported a greater FoF (p < .001) and a lower ability to avoid a fall (p < .001) in the "Approach condition" (but not in the "Avoidance condition") than in the "Control condition". The results of this study show that the effects of FoF do not solely depend on initial environmental conditions, but also on the direction of APA relative to the location of the postural threat. These results support the so-called Motivational Direction Hypothesis, according to which approach and avoidance behaviours are primed by emotional state.
- Published
- 2015