Strategies of healthy adults walking on a laterally oscillating treadmill

Brady, Rachael; Peters, B. T.; Bloomberg, Jacob J.

doi:10.1016/j.gaitpost.2009.01.010

Cited by 29 publications

(35 citation statements)

References 31 publications

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“…11). The increase in peak-to-peak COP position indicates an increase in step width, which is adjusted to compensate for lateral acceleration induced by external perturbations (e.g., Oddsson et al, 2004;Brady et al, 2009). The increase in lateral r.m.s.…”

Section: Discussionmentioning

confidence: 99%

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Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Sari

Griffin

2014

Applied Ergonomics

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While walking on an instrumented treadmill, 20 subjects were perturbed by lateral sinusoidal oscillations representative of those encountered in transport: frequencies in the range 0.5 to 2 Hz and accelerations in the range 0.1 to 2.0 ms -2 r.m.s., corresponding to velocities in the range 0.032 to 0.16 ms -1 r.m.s. Postural stability was assessed from the self-reported probability of losing balance (i.e., perceived risk of falling) and the movements of the centre of pressure beneath the feet. With the same acceleration at all frequencies, the velocities and displacements of the oscillatory perturbations were greater with the lower frequency oscillations, and these caused greater postural instability. With the same velocity at all frequencies, postural instability was almost independent of the frequency of oscillation.Movements of the centre of pressure show that subjects attempted to compensate for the perturbations by increasing their step width and increasing their step rate.

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Section: Discussionmentioning

confidence: 99%

“…Longer duration low frequency oscillations (0.2 to 0.5 Hz) of a treadmill on a six-axis motion platform (e.g., Brady et al, 2009;McAndrew et al, 2010) have been used to investigate postural responses to perturbations when walking but have not been representative of motions encountered in transport.…”

Section: Introductionmentioning

confidence: 99%

Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Sari

Griffin

2014

Applied Ergonomics

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“…For example, postXight tests with returning astronauts have shown that repeat Xyers re-adapt to a 1-g environment more rapidly than Wrsttime Xyers (Bloomberg et al 1997;Reschke et al 1998;Peters et al 2011), which might indicate greater proWciency at re-weighting. Our ground-based work has elucidated a similar spectrum of performances in healthy adults walking in novel discordant conditions (Brady et al 2009) that might indicate inherent diVerences in weighting preferences. The ability to consistently predict which individuals are more likely to be challenged in discordant sensory conditions is the Wrst step toward preparing them with early, speciWed gait training.…”

Section: Introductionmentioning

confidence: 87%

“…Evidence suggests that approximately 30 % of healthy normals are "highly" visually dependent (Warren et al 1996;Keshner 2004;Streepey et al 2007;Brady et al 2009), so we anticipated that of the 10 experimental subjects we recruited for our training program, at least a few would be noticeably more visually dependent than the others. The training study aVorded an opportunity to retrospectively relate performance measures to visual dependence should subjects with high visual dependence end up in our subject pool.…”

Section: Introductionmentioning

confidence: 99%

Gait adaptability training is affected by visual dependency

et al. 2012

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As part of a larger gait adaptability training study, we designed a program that presented combinations of visual flow and support-surface manipulations to investigate the response of healthy adults to walking on a treadmill in novel discordant sensorimotor conditions. A visual dependence score was determined for each subject, and this score was used to explore how visual dependency was linked to locomotor performance (1) during three training sessions and (2) in a new discordant environment presented at the conclusion of training. Performance measures included reaction time (RT), stride frequency (SF), and heart rate (HR), which respectively served as indicators of cognitive load, postural stability, and anxiety. We hypothesized that training would affect performance measures differently for highly visually dependent individuals than for their less visually dependent counterparts. A seemingly unrelated estimation analysis of RT, SF, and HR revealed a significant omnibus interaction of visual dependency by session (p < 0.001), suggesting that the magnitude of differences in these measures across training day 1 (TD1), training day 3 (TD3), and exposure to a novel test is dependent on subjects' levels of visual dependency. The RT result, in particular, suggested that highly visually dependent subjects successfully trained to one set of sensory discordant conditions but were unable to apply their adapted skills when introduced to a new sensory discordant environment. This finding augments rationale for developing customized gait training programs that are tailored to an individual. It highlights one factor--personal level of visual dependency--to consider when designing training conditions for a subject or patient. Finally, the link between visual dependency and locomotor performance may offer predictive insight regarding which subjects in a normal population will require more training when preparing for specific novel locomotor conditions.

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“…On the other hand, overground walking provides more familiar optic flow feedback and the option to freely modulate gait. Evidently, in some cases, the differences between these distinct locomotor modalities affect proprioceptive, vestibular, visual, and exteroceptive afferent information, and consequently influence locomotor control (Deshpande and Patla, 2005;Sorensen et al, 2002;Patla, 2003;Dickstein and Laufer, 2004;Brady et al, 2009;Dixon et al, 2000).…”

Section: Locomotor Modalities In Rehabilitation and Research 241 Ovmentioning

confidence: 99%

The effect of treadmill walking on the stride interval dynamics of children

Fairley

Sejdić

Chau

2010

Human Movement Science

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The stride interval of typical human gait is correlated over thousands of strides. This statistical persistence diminishes with age, disease, and pace-constrained walking. Considering the widespread use of treadmills in rehabilitation and research, it is important to understand the effect of this speed-constrained locomotor modality on stride interval dynamics. To this end, and given that the dynamics of children have been largely unexplored, this study investigated the impact of treadmill walking, both with and without handrail use, on paediatric stride interval dynamics. An initial stationarity analysis of stride interval time series identified both non-stationary and stationary signals during all walking conditions. Subsequent scaling analysis revealed diminished stride interval persistence during unsupported treadmill walking compared to overground walking. Finally, while the correlation between stride interval dynamics and gross energy expenditure was investigated in an effort to elucidate the clinical meaning of persistence, no simple linear correlation was found.ii DedicationTo my grandmother, whose inspiration I will carry with me always.iii Acknowledgements A sincere thank-you to my supervisor, Dr. Tom Chau, whose patience, support and guidance has allowed me to navigate the world of research. I am continually amazed by your dedication to your students and work, and am grateful for the knowledge and training that you have provided me.To my committee members, Dr. Karl Zabjek and Dr. Brian Maki, thank you for your invaluable feedback and advice.To the members of the PRISM lab, I am truly appreciative of your insights, perspectives and friendship. A special thank-you to Brian Nhan, Jorge Torres, Sarah Power and Stefanie Blain, with whom I shared an office, for your considerable help, thoughtful comments, good humour, and fun. Many thanks also to: Ervin Sejdić, for your expertise and contribution; Ka Lun Tam, for your technical wizardry; and Matthew Chang, for the thought-provoking discussions.

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Strategies of healthy adults walking on a laterally oscillating treadmill

Cited by 29 publications

References 31 publications

Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Gait adaptability training is affected by visual dependency

The effect of treadmill walking on the stride interval dynamics of children

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