The Effect of Optic Flow Speed on Active Participation During Robot-Assisted Treadmill Walking in Healthy Adults

2020 ◽  
Vol 28 (1) ◽  
pp. 221-227
Author(s):  
Emma De Keersmaecker ◽  
Nina Lefeber ◽  
Ben Serrien ◽  
Bart Jansen ◽  
Carlos Rodriguez-Guerrero ◽  
...  
Keyword(s):  
Optic Flow ◽  
Active Participation ◽  
Flow Speed ◽  
Healthy Adults ◽  
Treadmill Walking ◽  
Robot Assisted

scholarly journals Drivers Fail to Calibrate to Optic Flow Speed Changes During Automated Driving

2019 ◽  
Author(s):  
Callum Mole ◽  
Gustav Markkula ◽  
Oscar Giles ◽  
Yuki Okafuji ◽  
Richard Romano ◽  
...  
Keyword(s):  
Optic Flow ◽  
Flow Speed ◽  
Automated Driving

scholarly journals The need for speed: global optic flow speed influences steering

2016 ◽  
Vol 3 (5) ◽  
pp. 160096 ◽  
Author(s):  
Georgios K. Kountouriotis ◽  
Callum D. Mole ◽  
Natasha Merat ◽  
Richard M. Wilkie
Keyword(s):  
Optic Flow ◽  
Ground Plane ◽  
Visual Fields ◽  
Flow Speed ◽  
Sufficient Information ◽  
Global Flow ◽  
Steering Control ◽  
Flow Speeds ◽  
Curved Paths ◽  
Perceptual Variable

How do animals follow demarcated paths? Different species are sensitive to optic flow and one control solution is to maintain the balance of flow symmetry across visual fields; however, it is unclear whether animals are sensitive to changes in asymmetries when steering along curved paths. Flow asymmetries can alter the global properties of flow (i.e. flow speed) which may also influence steering control. We tested humans steering curved paths in a virtual environment. The scene was manipulated so that the ground plane to either side of the demarcated path produced larger or smaller asymmetries in optic flow. Independent of asymmetries and the locomotor speed, the scene properties were altered to produce either faster or slower globally averaged flow speeds. Results showed that rather than being influenced by changes in flow asymmetry, steering responded to global flow speed. We conclude that the human brain performs global averaging of flow speed from across the scene and uses this signal as an input for steering control. This finding is surprising since the demarcated path provided sufficient information to steer, whereas global flow speed (by itself) did not. To explain these findings, existing models of steering must be modified to include a new perceptual variable: namely global optic flow speed.

Metabolic and Cardiovascular Effects of Body Weight Support Treadmill Walking in Healthy Adults

2020 ◽  
Vol 31 (4) ◽  
pp. 167-171
Author(s):  
R. Scott Van Zant ◽  
Wick Colchagoff ◽  
Mike Kunish ◽  
Tamara Kunz ◽  
Mark Marshall ◽  
...  
Keyword(s):  
Body Weight ◽  
Cardiovascular Effects ◽  
Healthy Adults ◽  
Treadmill Walking ◽  
Body Weight Support ◽  
Weight Support

scholarly journals Effects of Optic Flow Speed and Lateral Flow Asymmetry on Locomotion in Younger and Older Adults: A Virtual Reality Study

2009 ◽  
Vol 64B (2) ◽  
pp. 222-231 ◽  
Author(s):  
Y.-h. Chou ◽  
R. C. Wagenaar ◽  
E. Saltzman ◽  
J. E. Giphart ◽  
D. Young ◽  
...  
Keyword(s):  
Older Adults ◽  
Virtual Reality ◽  
Optic Flow ◽  
Flow Speed ◽  
Lateral Flow ◽  
Flow Asymmetry

scholarly journals Human-Robot Interaction: Does Robotic Guidance Force Affect Gait-Related Brain Dynamics during Robot-Assisted Treadmill Walking?

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0140626 ◽  
Author(s):  
Kristel Knaepen ◽  
Andreas Mierau ◽  
Eva Swinnen ◽  
Helio Fernandez Tellez ◽  
Marc Michielsen ◽  
...  
Keyword(s):  
Treadmill Walking ◽  
Human Robot Interaction ◽  
Brain Dynamics ◽  
Robot Assisted ◽  
Robot Interaction ◽  
Guidance Force

Physiological responses and perceived exertion during robot-assisted treadmill walking in non-ambulatory stroke survivors

2019 ◽  
pp. 1-9 ◽  
Author(s):  
Nina Lefeber ◽  
Emma De Keersmaecker ◽  
Stieven Henderix ◽  
Marc Michielsen ◽  
Federica Tamburella ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Physiological Responses ◽  
Treadmill Walking ◽  
Stroke Survivors ◽  
Robot Assisted

scholarly journals Dual-task prioritization during overground and treadmill walking in healthy adults

2020 ◽  
Vol 75 ◽  
pp. 109-114 ◽  
Author(s):  
James G. Wrightson ◽  
Lisa Schäfer ◽  
Nicholas J. Smeeton
Keyword(s):  
Dual Task ◽  
Healthy Adults ◽  
Treadmill Walking ◽  
Task Prioritization

scholarly journals Physiological Responses and Perceived Exertion During Robot-Assisted and Body Weight–Supported Gait After Stroke

2018 ◽  
Vol 32 (12) ◽  
pp. 1043-1054 ◽  
Author(s):  
Nina Lefeber ◽  
Emma De Keersmaecker ◽  
Stieven Henderix ◽  
Marc Michielsen ◽  
Eric Kerckhofs ◽  
...  
Keyword(s):  
Heart Rate ◽  
Body Weight ◽  
Perceived Exertion ◽  
Minute Ventilation ◽  
Physiological Responses ◽  
Treadmill Walking ◽  
Robot Assisted ◽  
Future Studies ◽  
Weight Support ◽  
Robotic Devices

Introduction. Physiological responses are rarely considered during walking after stroke and if considered, only during a short period (3-6 minutes). The aims of this study were to examine physiological responses during 30-minute robot-assisted and body weight–supported treadmill and overground walking and compare intensities with exercise guidelines. Methods. A total of 14 ambulatory stroke survivors (age: 61 ± 9 years; time after stroke: 2.8 ± 2.8 months) participated in 3 separate randomized walking trials. Patients walked overground, on a treadmill, and in the Lokomat (60% robotic guidance) for 30 minutes at matched speeds (2.0 ± 0.5 km/h) and matched levels of body weight support (BWS; 41% ± 16%). Breath-by-breath gas analysis, heart rate, and perceived exertion were assessed continuously. Results. Net oxygen consumption, net carbon dioxide production, net heart rate, and net minute ventilation were about half as high during robot-assisted gait as during body weight–supported treadmill and overground walking ( P < .05). Net minute ventilation, net breathing frequency, and net perceived exertion significantly increased between 6 and 30 minutes (respectively, 1.8 L/min, 2 breaths/min, and 3.8 units). During Lokomat walking, exercise intensity was significantly below exercise recommendations; during body weight–supported overground and treadmill walking, minimum thresholds were reached (except for percentage of heart rate reserve during treadmill walking). Conclusion. In ambulatory stroke survivors, the oxygen and cardiorespiratory demand during robot-assisted gait at constant workload are considerably lower than during overground and treadmill walking at matched speeds and levels of body weight support. Future studies should examine how robotic devices can be Future studies should examine how robotic devices can be exploited to induce aerobic exercise.

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