Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Effects of feedback01:24

Effects of feedback

1.0K
Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
1.0K
Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

24.9K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
24.9K
Root Loci for Positive-Feedback Systems01:23

Root Loci for Positive-Feedback Systems

336
The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
The construction rules for the root locus in positive feedback systems are similar to those in...
336
Feedback Inhibition00:46

Feedback Inhibition

56.9K
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
56.9K
Feedback Loops01:01

Feedback Loops

64.2K
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
64.2K
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

387
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
387

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Soft tissue mobilization is more effective than self-stretching in the acute reduction of common wrist extensor tendon stiffness in recreational tennis players.

Physiotherapy theory and practice·2025
Same author

Auditory feedback effect on temporal patterns during self-pacing treadmill walking.

PloS one·2025
Same author

Wrist flexor and extensor tendon stiffness during functional grip: A pilot study.

Journal of bodywork and movement therapies·2025
Same author

Mechanisms of gait speed changes in middle-aged adults: Simultaneous analysis of magnitude and temporal effects.

Gait & posture·2024
Same author

Upper extremity soft tissue stiffness measured with shear wave elastography: A between-day reliability study.

Shoulder & elbow·2024
Same author

Common Wrist-Extensor Tendon and Pectoralis Muscle Stiffness in Healthy Recreational Tennis Players.

Journal of sport rehabilitation·2024

Related Experiment Video

Updated: Jan 21, 2026

A Vibrotactile Feedback Device for Seated Balance Assessment and Training
09:13

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

Published on: January 20, 2019

6.8K

The effects of a positional feedback device on rollator walker use: a validation study.

Courtney Golembiewski1, John Schultz1, Timothy Reissman1

  • 1Department of Mechanical and Aerospace Engineering, University of Dayton, Dayton, Ohio, USA.

Assistive Technology : the Official Journal of RESNA
|July 25, 2019
PubMed
Summary

A new visual feedback device helps rolling walker users walk closer to their walkers, aligning with clinical guidelines. This innovation shows promise for improving gait positioning in older adults.

Keywords:
kinematics of walker usersmobility aidsolder adultsrolling walkersstability and posturevisual feedback

More Related Videos

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

8.2K
Feeding Experimentation Device FED: Construction and Validation of an Open-source Device for Measuring Food Intake in Rodents
09:18

Feeding Experimentation Device FED: Construction and Validation of an Open-source Device for Measuring Food Intake in Rodents

Published on: February 21, 2017

8.6K

Related Experiment Videos

Last Updated: Jan 21, 2026

A Vibrotactile Feedback Device for Seated Balance Assessment and Training
09:13

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

Published on: January 20, 2019

6.8K
Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

8.2K
Feeding Experimentation Device FED: Construction and Validation of an Open-source Device for Measuring Food Intake in Rodents
09:18

Feeding Experimentation Device FED: Construction and Validation of an Open-source Device for Measuring Food Intake in Rodents

Published on: February 21, 2017

8.6K

Area of Science:

  • Biomechanics
  • Assistive Technology
  • Geriatric Rehabilitation

Background:

  • Clinical guidelines recommend rolling walker users position their feet between the walker's posterior wheels.
  • A significant portion (approximately 50%) of users do not adhere to this recommended positioning.

Purpose of the Study:

  • To develop and evaluate a custom device providing visual feedback to encourage improved user positioning with rolling walkers.
  • To assess the impact of this device on users' gait parameters and posture.

Main Methods:

  • The study involved 14 older adults using a custom-designed walker attachment with a non-contact distance sensor.
  • Visual feedback was provided to encourage a 10% reduction in the distance between the user and the walker.
  • Kinematic data were collected using wearable wireless inertial sensors.

Main Results:

  • Users ambulated an average of 20% closer to their walkers with the visual feedback device.
  • The primary adjustment observed was a reduction in shoulder flexion.
  • Minimal and variable changes were noted in trunk and cervical postures.

Conclusions:

  • The developed visual feedback device shows potential for guiding users to adopt safer walking positions closer to their walkers.
  • The device effectively captured user attention and promoted adherence to recommended positioning.
  • Further research is necessary to ascertain the long-term effects and postural improvements associated with the device.