Results 251 to 260 of about 1,377,713 (305)

Occlusal support and head posture

Journal of Oral Rehabilitation, 2002
In order to examine the relationship between occlusal support and head posture, the electromyographic (EMG) activities of the jaw closing muscles and the sternocleidomastoid muscle during voluntary maximal clenching (VMC) under several conditions of occlusal support in eight healthy dentates were recorded and analysed.
Y, Kibana, T, Ishijima, T, Hirai
exaly   +3 more sources

Effect of Head-Mounted Displays on Posture

Human Factors: The Journal of the Human Factors and Ergonomics Society, 2007
Objective: The aim of the present study was to determine if a wearable system based on a head-mounted display (HMD) causes users to alter their head position and adopt postures that place greater stress on the musculoskeletal system. Background: HMDs are common output devices used with wearable computers. HMDs provide the wearer with visual information
James F. Knight, Chris Baber
openaire   +3 more sources

Metabolic cost of head-stand posture

Journal of Applied Physiology, 1962
Metabolic cost to the human body of various postures has been assessed by many workers. The cost with the body in the topsy-turvy posture, or while “standing on the head,” has not been reported so far. Energy expenditure was calculated indirectly by estimating the amount of oxygen consumed while in a particular posture.
Shanker Rao
openaire   +3 more sources

Experimental manipulation of head posture

American Journal of Orthodontics, 1980
Variations in natural head position have been noted by previous workers to be associated with both dentoalveolar and craniofacial skeletal morphologic features. The determinants of cranial posture are as yet not known. Three experiments are described, dealing with the influence of (1) total nasal obstruction, (2) visual feedback deprivation, and (3) a ...
P S, Vig, K J, Showfety, C, Phillips
openaire   +2 more sources

Head Posture Measurement

Journal of Pediatric Ophthalmology & Strabismus, 1988
ABSTRACT A technique is needed that will accurately measure head posture at all ages and without instrument artifact. A simple photographic method that allows such quantitative measurements is described. Studies have confirmed that it provides an accurate record of the three components of head posture.
openaire   +2 more sources

Nasorespiratory function and head posture

American Journal of Orthodontics and Dentofacial Orthopedics, 1997
Impaired nasal breathing has been reported to cause changes in human head posture. The aim of this study was to assess whether there was any relationship between nasorespiratory function and variables of head posture in 58 young adults. The pressure flow technique was used to measure airflow rate and oral/nasal pressure and to calculate the smallest ...
J A, Huggare, M T, Laine-Alava
openaire   +2 more sources

The relationship between ortho head posture and head posture measured during walking

American Journal of Orthodontics and Dentofacial Orthopedics, 1997
Murphy, Preston, and Evans recognized the dynamic nature of head posture and developed instrumentation capable of measuring and recording this posture in a continuous manner. The aim of the current project was to use the newly developed instrumentation to determine whether the difference is statistically significant between the mean natural head ortho ...
C B, Preston, W G, Evans, J I, Todres
openaire   +2 more sources

Head posture in the Hominoidea

Journal of Zoology, 1973
The angle between the antero‐posterior plane of the occipital condyles and a vertical axis at right angles to the Frankfort Horizontal was measured in Homo sapiens, Gorilla, Pan, Pongo and casts of two Neanderthal skulls, the Rhodesian skull and three australopithecine skulls.
Moore, W. J., Adams, L. M., Lavelle, C. L. B.   +2 more
openaire   +1 more source

Evaluation of Head and Neck Postures

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2000
This paper describes the literature and two experiments on the evaluation of head and neck postures. It is concluded that health and safety professionals and ergonomists during posture evaluation should consider neck flexion/extension (head vs. trunk), besides the traditionally used inclination of the head and/or neck segment (head/neck vs. gravity).
openaire   +2 more sources

Posture of the Head and Pharyngeal Swallowing

Acta Radiologica. Diagnosis, 1986
Closure of the laryngeal vestibule during swallowing is important for protection of the airways. The present investigation included 53 patients with dysphagia examined cineradiographically with the head held in resting posture, flexion and extension. The ability to protect the airways by the downward movement of the epiglottis and by obliteration of ...
openaire   +2 more sources