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Author Liebermann, D.G.; Hoffman, J.R. url  doi
  Title 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  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue (up) Edition  
  ISSN 1050-6411 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:15642660 Approved no  
  Call Number Serial 39  
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Author Dario G. Liebermann; Larry Katz; and Ruth Morey Sorrentino openurl 
  Title Experienced Coaches’ Attitudes Towards Science and Technology Type Journal Article
  Year 2005 Publication International Journal of Computer Science in Sport Abbreviated Journal  
  Volume 4 Issue 1 Pages 21-28  
  Abstract In this study, the attitude of experienced coaches towards technologies and sport

sciences was assessed. A questionnaire was used to evaluate three areas: (1)

Attitudes towards technology and sport science in coaching, (2) Technology and

scientific knowledge in practice, and (3) Perceived importance of technology and

science in enhancing sport results. A group of 27 highly experienced coaches

completed the questionnaire. The questionnaire consisted of three parts, starting

with demographic information, followed by a series of 27 questions with answers

on a Likert scale ranging from strongly agree to strongly disagree, and finally,

coaches were requested to rank 14 well-defined ‘coaching goals’ from 1 (most

important) to 14 (least important). Results showed that top-level coaches rated

having a good relationship with the athletes’ as a major goal. Overall, members of

this group of experienced coaches seem to recognize the general importance of

sport sciences, and appear to be positive about the use of sport technologies, but

do not necessarily translate these positive attitudes into actual practice within

their competitive sport environments, even when they all use information

technology for other activities. According to these results, sport science

researchers and technology developers need to adapt their strategies. Coaching

education should encourage coaches to incorporate technologies as part of their

coaching routines. Developing innovative resources and incorporating them in

coaching education, as is done in some countries, may be a starting point.

However, placing the emphasis on educating successful coaches on the practical

use of technology and scientific knowledge is suggested as a short-term goal.

This may allow for a more immediate effect on the attitude and practice of less

senior coaches that tend to adopt methods and training routines through following

the personal example provided by top-level coaches.
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue (up) Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 66  
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