Forward and inverse dynamic study during pedaling: Comparison between the young and the elderly

The joint torques in hip, knee and ankle are computed using inverse dynamic model during standing up for a paraplegic patient. The joint torque comprises the dynamical torque due to the inertia forces, and a passive torque due to the muscles and gravitational torque. It has been observed that the contribution to the joint torques by the gravitational torque is dominant. On the basis of this result, a gravity balanced assistive device is proposed for the elderly and impaired people such as spinal cord injury and paraplegic patients. This passive device uses a hybrid method to identify the center of mass of the system using auxiliary parallelograms first. Next appropriate springs are connected to the device to vanish the total potential energy of the system due to the gravity during standing up. A prototype with the underlying principles is currently being fabricated at the University of Delaware.

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INVERSE DYNAMIC ROBUST CONTROL OF SIT-TO-STAND MOVEMENT

Biomedical Engineering Applications Basis and Communications ◽

10.4015/s1016237219500418 ◽

2019 ◽

Vol 31 (06) ◽

pp. 1950041

Author(s):

Mohammad Hassan Nematollahi ◽

Seyyed Arash Haghpanah ◽

Sajjad Taghvaei

Keyword(s):

Dynamic Model ◽

The Elderly ◽

Anthropometric Parameters ◽

Inverse Dynamic ◽

Lagrange’S Equation ◽

Sit To Stand ◽

Embedded Controller ◽

Bounded Disturbances ◽

Independent Life ◽

And Control

Sit-to-stand (STS) motion is one of the most common movements of a person during daily life. The motion, as a prerequisite for other movements, such as running and climbing, can be a very challenging task for the elderly or disabled people. Assistant tools, such as auxiliary walkers and exoskeletons, are commonly used to help these individuals have independent or at least semi-independent life. In order to design efficient rehabilitation treatments and also develop assistive devices for STS motion, it is necessary to have a validated dynamic model with an appropriate embedded controller on the ancillary instrument to reach the desired posture of the human body. In this paper, a linkage-based dynamic model of STS motion using Lagrange’s equation is extracted. The dynamic of the model is simulated using anthropometric parameters associated with the subject. Moreover, two robust controller types are designed and implemented in the presence of sinusoidal bounded disturbances in the dynamic system on the model in order to track the desired trajectory acquired from experimental kinematic data. The simulation results of the controlled dynamic model are compared with experimental data from a healthy subject and demonstrate the performance of the controller. The proposed model can be utilized in the design and control of an assistance device for STS motion.

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Cell surface changes during aging of human bladder epithelium examined by lectin probes and SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100162429 ◽

1990 ◽

Vol 48 (3) ◽

pp. 966-967

Author(s):

J. Jacob ◽

M.F.M. Ismail

Keyword(s):

The Elderly ◽

Ultrastructural Changes ◽

Pokeweed Mitogen ◽

Asymmetric Structure ◽

Luminal Surface ◽

Bladder Epithelium ◽

Aldehyde Groups ◽

Cell Surface Changes ◽

Phosphate Buffered Saline ◽

Surface Changes

Ultrastructural changes have been shown to occur in the urinary bladder epithelium (urothelium) during the life span of humans. With increasing age, the luminal surface becomes more flexible and develops simple microvilli-like processes. Furthermore, the specialised asymmetric structure of the luminal plasma membrane is relatively more prominent in the young than in the elderly. The nature of the changes at the luminal surface is now explored by lectin-mediated adsorption visualised by scanning electron microscopy (SEM).Samples of young adult (21-31 y old) and elderly (58-82 y old) urothelia were fixed in buffered 2% glutaraldehyde for 10 m and washed with phosphate buffered saline (PBS) containing Ca++ and Mg++ at room temperature. They were incubated overnight at 4°C in 0.1 M ammonium chloride in PBS to block any remaining aldehyde groups. The samples were then allowed to stand in PBS at 37°C for 2 h before incubation at 37°C for 30 m with lectins. The lectins used were concanavalin A (Con A), wheat germ agglutinin (WGA), phytohaemagglutinin (PHA) and pokeweed mitogen (PWM) at a concentration of 500 mg/ml in PBS at pH 7.A.

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The effect of dental geriatric curricula on attitudes toward the elderly

Journal of Dental Education ◽

10.1002/j.0022-0337.1988.52.9.tb02232.x ◽

1988 ◽

Vol 52 (9) ◽

pp. 516-518 ◽

Cited By ~ 2

Author(s):

J Mann ◽

TJ Bomberg ◽

JM Holtzman ◽

DB Berkey

Keyword(s):

The Elderly

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Speech-Language Pathologists' Attitudes Toward Aging and the Elderly

Contemporary Issues in Communication Science and Disorders ◽

10.1044/cicsd_30_f_146 ◽

2003 ◽

Vol 30 (Fall) ◽

pp. 146-155 ◽

Cited By ~ 5

Author(s):

Jeff Searl ◽

Rodney M. Gabel

Keyword(s):

The Elderly ◽

Speech Language Pathologists ◽

Attitudes Toward Aging

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Pharmacology Issues Related to Dementia Syndrome of Depression in Elderly Residents of Long-Term Care Settings

Perspectives on Neurophysiology and Neurogenic Speech and Language Disorders ◽

10.1044/nnsld25.2.61 ◽

2015 ◽

Vol 25 (2) ◽

pp. 61-69

Author(s):

Angel L. Ball ◽

Adina S. Gray

Keyword(s):

Depressive Symptoms ◽

The Elderly ◽

Environmental Communication ◽

Pharmacological Intervention ◽

Team Approach ◽

Discussion Paper ◽

Term Care ◽

Anticholinergic Medications ◽

Inappropriate Treatment ◽

Dementia Syndrome

Pharmacological intervention for depressive symptoms in institutionalized elderly is higher than the population average. Among the patients on such medications are those with a puzzling mix of symptoms, diagnosed as “dementia syndrome of depression,” formerly termed “pseudodementia”. Cognitive-communicative changes, potentially due to medications, complicate the diagnosis even further. This discussion paper reviews the history of the terminology of “pseudodementia,” and examines the pharmacology given as treatment for depressive symptoms in the elderly population that can affect cognition and communication. Clinicians can reduce the risk of misdiagnosis or inappropriate treatment by having an awareness of potential side effects, including decreased attention, memory, and reasoning capacities, particularly due to some anticholinergic medications. A team approach to care should include a cohesive effort directed at caution against over-medication, informed management of polypharmacology, enhancement of environmental/communication supports and quality of life, and recognizing the typical nature of some depressive signs in elderly institutionalized individuals.

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