The effects of armrests and high seat heights on lower-limb joint load and muscular activity during sitting and rising

The loading moment of force on the hip, knee, and ankle joints of nine healthy men rising from four different types of stools were compared, together with the levels of myoelectrical activity (EMG) in four leg muscles. Two types of stool (stand stools) had higher seats than a normal chair. The other...

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Bibliographic Details
Published in:Ergonomics 1992-11, Vol.35 (11), p.1377-1391
Main Authors: ARBORELIUS, ULF P., WRETENBERG, PER, LINDBERG, FREDRIK
Format: Article
Language:English
Subjects:
Adult
Ankle Joint - physiology
Applied physiology
Biological and medical sciences
Biomechanics
Buttocks - physiology
Chairs
Electromyography
Ergonomics
Ergonomics. Work place. Occupational physiology
Hip Joint - physiology
Human physiology applied to population studies and life conditions. Human ecophysiology
Humans
Interior Design and Furnishings
Joint load
Knee Joint - physiology
Leg - physiology
Legs
Lower extremity
Male
Medical sciences
Movement
Muscles - physiology
Muscular system
Rising
Sitting work posture
Space life sciences
Weight-Bearing - physiology
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Summary:The loading moment of force on the hip, knee, and ankle joints of nine healthy men rising from four different types of stools were compared, together with the levels of myoelectrical activity (EMG) in four leg muscles. Two types of stool (stand stools) had higher seats than a normal chair. The other two were of ordinary seat height, but one also had armrests. The bodyweight carried by the different stools when sitting was also measured, and the subjects estimated the effort required for each trial. The mean maximum knee moment was over 60% lower when rising from the high stool than from 'ordinary' seat height. The difference between the high and low stand stool was also significant (p
ISSN:0014-0139
1366-5847
1366-5847
DOI:10.1080/00140139208967399