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Author Carmeli E.; Liebermann, D.G.
Title (up) The Function of the Aging Hand Type Book Chapter
Year 2007 Publication The Geriatric Rehabilitation Manual Abbreviated Journal
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Publisher Elsevier Place of Publication NY Editor T. L. Kauffman; M. Moran; J. Barr
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Notes Approved no
Call Number Serial 46
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Author Liebermann, D.G.; Franks, I. M.
Title (up) The use of feedback-based technologies in skill acquisition Type Book Chapter
Year 2004 Publication Notational analysis of Sport and Coaching Science Abbreviated Journal
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Publisher E & FN Spon Pub Place of Publication Editor M. Hughes; I.M. Franks
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Notes Approved no
Call Number Serial 45
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Author Goodman, D.; Liebermann, D.G.
Title (up) Time-to-contact as a determiner of action: vision and motor control Type Book Chapter
Year 1992 Publication Vision and Motor Control Abbreviated Journal
Volume Issue Pages 335-349
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Publisher Elsevier Pub. Co Place of Publication Amsterdam, Holland Editor D. Elliott; J. Proteau
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Notes Approved no
Call Number Serial 43
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Author Liebermann, D.G.; Hoffman, J.R.
Title (up) Timing of preparatory landing responses as a function of availability of optic flow information Type Journal Article
Year 2005 Publication Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology Abbreviated Journal J Electromyogr Kinesiol
Volume 15 Issue 1 Pages 120-130
Keywords Adult; Cues; Electromyography; Humans; Male; Movement/physiology; Muscle, Skeletal/*physiology; Posture/physiology; Psychomotor Performance/*physiology; Vision, Ocular/*physiology
Abstract This study investigated temporal patterns of EMG activity during self-initiated falls with different optic flow information ('gaze directions'). Onsets of EMG during the flight phase were monitored from five experienced volunteers that completed 72 landings in three gaze directions (downward, mid-range and horizontal) and six heights of fall (10-130 cm). EMG recordings were obtained from the right gastrocnemius, tibialis anterior, biceps femoris and rectus femoris muscles, and used to determine the latency of onset (L(o)) and the perceived time to contact (T(c)). Impacts at touchdown were also monitored using as estimates the major peak of the vertical ground reaction forces (F(max)) normalized to body mass, time to peak (T(max)), peak impulse (I(norm)) normalized to momentum, and rate of change of force (dF(max)/dt). Results showed that L(o) was longer as heights of fall increased, but remained within a narrow time-window at >50 cm landings. No significant differences in L(o) were observed when gaze direction was changed. The relationship between T(c) and flight time followed a linear trend regardless of gaze direction. Gaze direction did not significantly affect the landing impacts. In conclusion, availability of optic flow during landing does not play a major role in triggering the preparatory muscle actions in self-initiated falls. Once a structured landing plan has been acquired, the relevant muscles respond relative to the start of the fall.
Address Department of Physical Therapy, Sackler Faculty of Medicine, Stanley Steyer School of Health Professions, University of Tel Aviv, Ramat Aviv, 69978 Tel Aviv, Israel
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Publisher Place of Publication Editor
Language English Summary Language Original Title
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ISSN 1050-6411 ISBN Medium
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Notes PMID:15642660 Approved no
Call Number Serial 39
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Author Uri, O.; Pritsch, M.; Oran, A.; Liebermann, D.G.
Title (up) Upper limb kinematics after arthroscopic and open shoulder stabilization Type Journal Article
Year 2014 Publication Journal of Shoulder and Elbow Surgery Abbreviated Journal Journal of Shoulder and Elbow Surgery
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Language Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 1058-2746 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number Serial 75
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