Effects of Age, Step Direction, and Reaction Condition on the Ability to Step Quickly

Luchies, Carl W.; Schiffman, Jeff M.; Richards, Lorie; Thompson, Matthew R.; Bazuin, Doug; DeYoung, Alice J.

doi:10.1093/gerona/57.4.m246

Cited by 89 publications

(77 citation statements)

References 21 publications

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“…Some of the factors that have an influence on sensorimotor responses include the state of attention of arousal [22], age [23][24][25][26], and sex [27][28]. The type of stimuli also plays a role, and it has been shown that the reaction to touch (tactile stimuli) is about 155 ms, which is comparable with auditory RTs (140-160 ms) but slower than visual RTs (180-200 ms); the main differences are attributed to the time it takes the brain to receive the signal [29].…”

Section: Artificial Sensory Feedback Systems In Prostheses May Ultimamentioning

confidence: 99%

Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses

et al. 2014

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Abstract-People with lower-limb amputation have reduced mobility due to loss of sensory information, which may be restored by artificial sensory feedback systems built into prostheses. For an effective system, it is important to understand how humans sense, interpret, and respond to the feedback that would be provided. The goal of this study was to examine sensorimotor responses to mobility-relevant stimuli. Three experiments were performed to examine the effects of location of stimuli, frequency of stimuli, and means for providing the response. Stimuli, given as vibrations, were applied to the thigh region, and responses involved leg movements. Sensorimotor reaction time (RT) was measured as the duration between application of the stimulus and initiation of the response. Accuracy of response was also measured. Overall average RTs for one response option were 0.808 +/-0.142 s, and response accuracies were >90%. Higher frequencies (220 vs 140 Hz) of vibration stimulus provided in anterior regions of the thigh produced the fastest RTs. When participants were presented with more than one stimulus and response option, RTs increased. Findings suggest that long sensorimotor responses may be a limiting factor in the development of an artificial feedback system for mobility rehabilitation applications; however, feed-forward techniques could potentially help to address these limitations.

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Section: Artificial Sensory Feedback Systems In Prostheses May Ultimamentioning

confidence: 99%

Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses

et al. 2014

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“…(Elble et al 1996) Furthermore, older adults with balance impairments have greater step initiation times compared with older adults without balance impairments. (Medell and Alexander 2000;Lord and Fitzpatrick 2001) The time to make a step increases further when there is uncertainty about the direction of the step, (Patla et al 1993;Lord and Fitzpatrick 2001;Luchies et al 2002;Rogers et al 2003) suggesting that central nervous system (i.e. skeletomotor circuit) resources are required to select an appropriate motor response.…”

Section: Discussionmentioning

confidence: 99%

Delays in auditory-cued step initiation are related to increased volume of white matter hyperintensities in older adults

et al. 2008

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An increased volume of white matter hyperintensities (WMH) on MRI has been associated with mobility impairments in older adults. The objective of this preliminary study was to investigate the relationship between the volume of WMH and delays in auditory-cued step initiation. Eight subjects aged 75-83 y participated. The WMH volume in the corticospinal tracts and anterior thalamic radiations were summed. Subjects performed an auditory-cued stepping task that included two simple reaction time (SRT) trials and three choice reaction time (CRT) trials. SRT trials required subjects to step as quickly as possible with the right foot from a symmetric standing position to a single target position in response to an auditory stimulus. For the CRT trials, subjects stepped as quickly as possible to one of two possible locations, depending on the auditory stimulus. The time from the stimulus onset to the reaction time of the anticipatory postural adjustment (APA RT ) and liftoff (LO) of the right foot was computed for each stimulus. The mean APA RT and LO were greater for the CRT steps compared with the SRT steps to the same location. Increases in WMH were significantly associated with larger APA RT and LO during both SRT and CRT for both target locations. These data suggest that increased volume of WMH is associated with greater central processing time during voluntary step initiation, and highlight a possible mechanism that can help to explain how damage to white matter tracts affects mobility in older adults.

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“…Tato otázka vyvstala z předpokladu, že v adolescentním období ještě pokračuje vývojové zdokonalování některých senzomotorických mechanismů včetně zpracování informací pro programování pohybové odpovědi (Quatman-Yates, Quatman, Meszaros, Paterno, & Hewett, 2012). Tento předpoklad podporují evidence zkracování doby jednoduché a výběrové vizuální reakce od dětství až do třetího decénia (Dykiert et al, 2012;Luchies, Schiff man, Richards, Thompson, Bazuin, & DeYoung, 2002).…”

Section: Změny Zhoršené Motorické Koordinace a Schopnosti Zpracovat Vunclassified

Motor coordination and visual information processing in high school students at risk of developmental coordination disorder: Two year follow-up study

Psotta¹,

Kraus²

2014

Telesna kultura

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Předloženo v listopadu 2014VÝCHODISKA: Vývojovou poruchu pohybové koordinace u dětí (DCD) charakterizuje podstatně nižší úroveň pohybových dovedností, než by se oče-kávala vzhledem k věku. Tento defi cit může přinášet negativní dopady na psychosociální vývoj dítěte a úspěšnost ve školním vzdělávání. Jen několik studií poskytuje důkazy o přetrvávání obtíží v motorické koordinaci až do střední a pozdní adolescence. Ačkoli se DCD považuje za heterogenní syndrom, zdá se, že tento defi cit je nejčastěji spojen s problémy ve zpracování vizuálních informací.CÍL: Prvním cílem studie bylo prozkoumat, jak může být podprůměrná úroveň motorické koordinace u adolescentů spojena s funkcí pro zpracování vizuálních informací. Druhým cílem bylo zjistit možné vývojové změny zhoršené pohybové koordinace a prozkoumat, zda její perzistence nebo naopak její zmírnění během adolescentního období může být spojeno s úrovní zpracování vizuálních informací jedinců.METODIKA: V první fázi studie byl u studentů středních škol a učilišť s podprůměrnou úrovní motorické koordinace (n = 52) identifi kovanou testem MABC-2 (Henderson, Sugden, & Barnett, 2007) analyzován vztah této koordinace se schopností zpracovat vizuální informace. Tato schopnost byla hodnocena testy jednoduché a výběrové reakce na vizuální podněty (zařízení FiTRO Reaction Check). Současně byl použit test pozornosti d2. V druhé fázi studie byli studenti s mírnými až významnými motorickými obtížemi (n = 34) opakovaně testováni dva roky po vstupním testování pro hodnocení změn motorické

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Effects of Age, Step Direction, and Reaction Condition on the Ability to Step Quickly

Cited by 89 publications

References 21 publications

Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses

Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses

Delays in auditory-cued step initiation are related to increased volume of white matter hyperintensities in older adults

Motor coordination and visual information processing in high school students at risk of developmental coordination disorder: Two year follow-up study

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