Abstract：
:Anticipatory responses to inversion perturbations can prevent an accurate assessment of lateral ankle sprain mechanics when using injury simulations. Despite recent evidence of the anticipatory motor control strategies utilized during inversion perturbations, kinetic compensations during anticipated inversion perturbations are currently unknown. The purpose of this investigation was to examine the influence of anticipation to an inversion perturbation during a single-leg drop landing on ankle joint and impact kinetics. Fifteen young adults with no lateral ankle sprain history completed unanticipated and anticipated single-leg drop landings onto a 25° laterally inclined platform from a height of 30 cm. One-dimensional statistical parametric mapping (SPM) was used to analyze net ankle moments and ground reaction forces (GRF) during the first 150 ms post-landing, while peak GRFs, time to peak GRF, peak and average loading rates were compared using a dependent samples t-test (p ≤ 0.05). Results from the SPM analysis revealed significantly greater plantar flexion moment from 58 to 83 ms post-landing (p = 0.004; d = 0.64-0.77), inversion moment from 89 to 91 ms post-landing (p = 0.050; d = 0.58-0.60), and medial GRF from 62 to 97 ms post-landing (p < 0.001; d = 1.00-2.39) during the unanticipated landing condition. Moreover, significantly greater peak plantarflexion (p < 0.001; d = 1.10) and peak inversion moment (p = 0.007; d = 0.94), as well as greater peak (p = 0.002; d = 1.03) and average (p = 0.042; d = 0.66) medial loading rates, were found during the unanticipated landing condition. Our findings suggest alterations to ankle joint and impact kinetics occur during a single-leg drop landing when inversion perturbations are anticipated. Researchers and practitioners using drop-landings onto a tilted surface to assess lateral ankle sprain injury risk should consider implementing protocols that mitigate anticipatory responses.
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Simpson JD,Stewart EM,Rendos NK,Cosio-Lima L,Wilson SJ,Macias DM,Chander H,Knight ACdoi
10.1016/j.humov.2019.03.015subject
Has Abstractpub_date
2019-03-22 00:00:00pages
22-30eissn
0167-9457issn
1872-7646pii
S0167-9457(19)30006-5journal_volume
66pub_type
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