Sports activities are reflected in the local stability and regularity of body sway: Older ice-skaters have better postural control than inactive elderly

Vuillerme, 2007, How attentional focus on body sway affects postural control during quiet standing, Psychol Res, 71, 192, 10.1007/s00426-005-0018-2 Schmit, 2005, Dynamic patterns of postural sway in ballet dancers and track athletes, Exp Brain Res, 163, 370, 10.1007/s00221-004-2185-6 Lamoth, 2009, Athletic skill level is reflected in body sway: a test case for accelometry in combination with stochastic dynamics, Gait Posture, 29, 546, 10.1016/j.gaitpost.2008.12.006 Sturnieks, 2008, Balance disorders in the elderly, Neurophysiol Clin, 38, 467, 10.1016/j.neucli.2008.09.001 Howe, 2007, Exercise for improving balance in older people, Cochrane Database Syst Rev (Online), CD004963 Schmit, 2006, Deterministic center of pressure patterns characterize postural instability in Parkinson's disease, Exp Brain Res, 168, 357, 10.1007/s00221-005-0094-y Houdijk, 2010, Energy expenditure of stroke patients during postural control tasks, Gait Posture, 32, 321, 10.1016/j.gaitpost.2010.05.016 Huxhold, 2006, Dual-tasking postural control: aging and the effects of cognitive demand in conjunction with focus of attention, Brain Res Bull, 69, 294, 10.1016/j.brainresbull.2006.01.002 Kang, 2008, Separating the effects of age and walking speed on gait variability, Gait Posture, 27, 572, 10.1016/j.gaitpost.2007.07.009 IJmker T, Lamoth CJ. Gait and cognition: the relationship between gait stability and variability with executive function in persons with and without dementia. Gait Posture; 2011; Oct 1, doi:10.1016/j.gaitpost.2011.08.022. [Epub ahead of print]. Granata, 2008, Dynamic stability differences in fall-prone and healthy adults, J Electromyogr Kinesiol, 18, 172, 10.1016/j.jelekin.2007.06.008 Stins, 2009, Sway regularity reflects attentional involvement in postural control: effects of expertise, vision and cognition, Gait Posture, 30, 106, 10.1016/j.gaitpost.2009.04.001 Zatsiorsky, 2000, Rambling and trembling in quiet standing, Motor Control, 4, 185, 10.1123/mcj.4.2.185 Goldberger, 1996, Non-linear dynamics for clinicians: chaos theory, fractals, and complexity at the bedside, Lancet, 347, 1312, 10.1016/S0140-6736(96)90948-4 Stergiou, 2006, Optimal movement variability: a new theoretical perspective for neurologic physical therapy, J Neurol Phys Ther, 30, 120, 10.1097/01.NPT.0000281949.48193.d9 Barnett, 2003, Community-based group exercise improves balance and reduces falls in at-risk older people: a randomised controlled trial, Age Ageing, 32, 407, 10.1093/ageing/32.4.407 Wolf, 1996, Reducing frailty and falls in older persons: an investigation of Tai Chi and computerized balance training. Atlanta FICSIT Group. Frailty and injuries: cooperative studies of intervention techniques, J Am Geriatr Soc, 44, 489, 10.1111/j.1532-5415.1996.tb01432.x Orr, 2008, Efficacy of progressive resistance training on balance performance in older adults: a systematic review of randomized controlled trials, Sports Med, 38, 317, 10.2165/00007256-200838040-00004 Raty, 2002, Dynamic balance in former elite male athletes and in community control subjects, Scand J Med Sci Sports, 12, 111, 10.1034/j.1600-0838.2002.120208.x Perrin, 1999, Effects of physical and sporting activities on balance control in elderly people, Br J Sports Med, 33, 121, 10.1136/bjsm.33.2.121 Gauchard, 2001, Physical and sporting activities improve vestibular afferent usage and balance in elderly human subjects, Gerontology, 47, 263, 10.1159/000052810 Swan, 2007, Reducing postural sway by manipulating the difficulty levels of a cognitive task and a balance task, Gait Posture, 26, 470, 10.1016/j.gaitpost.2006.11.201 Moe-Nilssen, 2002, Trunk accelerometry as a measure of balance control during quiet standing, Gait Posture, 16, 60, 10.1016/S0966-6362(01)00200-4 Richman, 2000, Physiological time-series analysis using approximate entropy and sample entropy, Am J Physiol Heart Circ Physiol, 278, H2039, 10.1152/ajpheart.2000.278.6.H2039 Rosenstein, 1993, A practical method for calculating largest Lyapunov exponents from small data sets, Physica D, 65, 117, 10.1016/0167-2789(93)90009-P Lamoth, 2009, Athletic skill level is reflected in body sway: a test case for accelometry in combination with stochastic dynamics, Gait Posture, 29, 546, 10.1016/j.gaitpost.2008.12.006 Lamoth, 2010, Variability and stability analysis of walking of transfemoral amputees, Med Eng Phys, 10.1016/j.medengphy.2010.07.001 Pyykko, 1990, Postural control in elderly subjects, Age Ageing, 19, 215, 10.1093/ageing/19.3.215 Brauer, 2008, Balance control in the elderly: do Masters athletes show more efficient balance responses than healthy older adults?, Aging Clin Exp Res, 20, 406, 10.1007/BF03325145 Woollacott, 2002, Attention and the control of posture and gait: a review of an emerging area of research, Gait Posture, 16, 1, 10.1016/S0966-6362(01)00156-4 Pavlou, 2011, The effect of repeated visual motion stimuli on visual dependence and postural control in normal subjects, Gait Posture, 33, 113, 10.1016/j.gaitpost.2010.10.085 Witkin, 1948, Studies in space orientation; further experiments on perception of the upright with displaced visual fields, J Exp Psychol, 38, 762, 10.1037/h0053671 Bulbulian, 2000, The effect of activity history and current activity on static and dynamic postural balance in older adults, Physiol Behav, 70, 319, 10.1016/S0031-9384(00)00272-9