Sitting biomechanics Part I: Review of the Literature

Harrison, Donald D.; Harrison, Sanghak O.; Croft, Arthur C.; Harrison, Deed E.; Troyanovich, Stephan J.

doi:10.1016/s0161-4754(99)70020-5

Cited by 237 publications

(192 citation statements)

References 79 publications

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“…Tilt the seat angle slightly forward 5 to 15° to increase the low back curve. This will place your hips slightly higher than your knees and increase the hip angle to greater than 90°, which may allow for closer positioning to the patient (Harrison et al, 1999;Chaffin et al, 1999). (6) Adjust armrests to support elbows in the neutral shoulder position.…”

Section: Prevention Of Neck Shoulder and Back Problemsmentioning

confidence: 99%

Posturedontics in dentistry: A review

Mathew¹

2015

J. Dent. Oral Hyg.

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Dentistry is a profession that generally produces muscular pain and soreness, they are usually harmless and slow to appear; consequently, the symptoms are usually ignored until they become chronic and permanent lesions are present. When practicing, dentists sometimes are forced to adopt unhealthy postures which depend mainly on factors related to the working conditions. Also, they are exposed to biomechanical risk factors, which indicates that work forced postures, would imply more risk of soreness and presence of skeletal-muscle lesions. These problems could begin to appear at the beginning of the students learning period, by acquiring inadequate postures and working habits that will accompany them for the rest of their professional life, acquiring an unhealthy lifestyle in their work environment. This can ultimately lead to musculoskeletal disorder (MSD). To protect their own health, dentists should seek out and receive education about musculoskeletal health, and injury prevention during work, by relaxation techniques, breathing and stretching exercises, etc. Very little attention is given on impact of dental work on the development of nerve and muscle pathologies. Therefore, the aim of this review was to critically analyze the literature on the prevalence of musculoskeletal pain and possible aetiology of this problem in dental professionals, and the various postural strategies and stretching and strengthening techniques during breaks to ensure long term comfort, efficiency and ease in dental practice.

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Section: Prevention Of Neck Shoulder and Back Problemsmentioning

confidence: 99%

Posturedontics in dentistry: A review

Mathew¹

2015

J. Dent. Oral Hyg.

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“…Keegan considered kyphosis as harmful for the lumbar intervertebral disc, however, others reported the benefi cial infl uence of lumbar kyphosis. Harrison and colleagues 15 noticed that in kyphotic position of the lumbar spine a greater amount of intradiscal pressure can be experienced that can cause degeneration of the lumbar intervertebral disc. In kyphosis the shear force pulls the disc posterior possibly leading to the bulging of the disc which can contact the sensitive ligaments and nerve roots by generating pain.…”

Section: Original Articlesmentioning

confidence: 99%

Estimation of moments acting on the pelvis in standing and in two different sitting postures

Héra¹,

Zalavári²

2014

Biomech Hung

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According to popular consideration prolonged sitting posture in work can cause pain at different regions of the back. Many researches aiming to defi ne the relationship between these two, and as a result of noticing the problem many design solutions can be found, some of which are considered as alternative. Healthy sitting posture should be mean that with anterior rotation of the pelvis the curve of the lumbar spine would be neutral or more preferably lordotic. In sitting the muscle balance changes thus there is more muscle activity needed for erection of the trunk and anterior rotation of the pelvis. In this study muscle activity in standing and in two different sitting postures is estimated as a difference of the two moments acting on the pelvis, which are the upper body weight moment and the passive elastic moment. Further investigation of the effects of hip-fl exing thigh muscles or other passive tissues on pelvic range of motion is warranted.

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“…An extensive review of normal postural alignment and the effects of abnormal posture on the neuromusculoskeletal system with reference to chiropractic has already been presented elsewhere. 2 All possible human postures have been categorized by Harrison et al 20,21 from the perspective of abnormal postural permutations calculated as rotations and translations from an ideal normal upright static spine. This traditional analysis of posture (abnormal static alignment) being consistent with basic mathematics and physics principles is extremely useful in that these static alterations result in consequences for the involved tissues and how those tissues perform when in motion.…”

Section: Postural Alignment and Chiropractic Subluxationmentioning

confidence: 99%

“…Traditionally, posture has been characterized in the chiropractic field as a form of biomechanical linkage (attitude) in terms of musculoskeletal symmetric relationships between segments; this is indicated by the work of Harrison et al, [20][21][22] who have extensively modeled posture in engineering terms as rotations and translations of the head, thoracic cage, and pelvis in 3 dimensions. In this article we take a different approach, treating posture not as a particular alignment of segments per se but instead as a dynamic behavior whose goal is to facilitate other overt behaviors (actions) that we perform.…”

Section: Introductionmentioning

confidence: 99%