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- W2328566912 startingPage "130" @default.
- W2328566912 abstract "In enduring a posture in actual living conditions, spontaneously appearing posture changes are considered to play an important role, In this paper, patterns of subsidiary postural changes while working sustaining a certain posture for hours were discussed by analyzing the factors leading to increase of those changes. During a prolonged experimental work period of numeral inspection that demanded short-term memories, variations in frequency of posture changes were apparently dependent on the day's condition and changes in alertness. The rate of those postural changes which recurred at variable intervals of one to several minutes was revealed to be greatly influenced by when and how long the state of sustained attention was affected. In the case of printing workers working while continuously standing, the patterns of posture changes differed between different types of standing conditions. Postural changes enabling resting of the lower extremities or active muscle groups increased during later hours in the afternoon as a result of compensating fatigue, the leg motion rate being significantly related with the rate of subsidiary upper limb activities, whereas the spontaneous leg motions of workeres inserting work-oriented steppings were less frequent and had no correlation with upper limb motions. Postural changes of sitting key-hoard operators were much less and related with other types of subsidiary behavior. These results indicate that the patterns of postural changes are a function of complex factors of the task performing situation that requires a surtained position, and that changes in the central nervous system and in orienting behavior being relevant to motor control functions should be taken into account. Further studies are needed to elucidate conditions of provoking spontaneous changes in human posture in order to discuss their relevance to the mechanism of sustaining an erect standing or a sitting posture for a long period." @default.
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- W2328566912 date "1979-01-01" @default.
- W2328566912 modified "2023-09-24" @default.
- W2328566912 title "Posture Changes in Continuously Working Conditions" @default.
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- W2328566912 doi "https://doi.org/10.1537/ase1911.87.130" @default.
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