The Relationship between the Trunk Muscles Activities and Postural Sway during Unstable Sitting

In order to find effective movements on an office chair for preventing back pain, the paper measures EMG (electromyogram) signal and evaluates cognitive test. Core muscles of subjects on a balance ball are measured when there are forced movement and voluntary movement of the ball. The measurements show the forced movement and discontinuity movement on the ball is more effective in the meaning of muscle activity. The paper also studies the effect of movement with the balance ball on the efficiency of office workers. This is because, even if the movement is good for preventing back pain, it is not desirable to reduce work efficiency. Two cognitive tests, addition test and flanker test, are used to investigate the efficiency of office workers when the movements with the balance ball and no movements with normal chair in the view points of work reduction rate and correct answer rate. The results show the efficiency of office workers is almost the same as the case of movements with the balance ball and no movements with normal chair. Totally the study shows effective movements on the balance ball which activate the core muscle activity efficiently. It also shows the movement does not reduce the office work efficiency.

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EMG measurement and cognitive test evaluation when using a balance ball toward the development of an office chair for preventing back pain

Kitamura

Nakashima

Shono³

et al. 2021

Transactions of the JSME (In Japanese)

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Relationship between the Ability to Sit on a Balance Cushion and Parameters of One Leg Standing

Sasaki

Sato

Ohinata³

et al. 2011

Rigakuryoho kagaku

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[Purpose] In order to investigate whether sitting on a balance cushion (BC) can be used as an assessment method for the trunk, we examined the relationship between ability to sit on a balance cushion and center of pressure (body) sway in one leg standing.[Subjects] The subjects were 93 healthy young women with no balance disorders or decline in muscle strength. [Method] We assessed sitting ability on the BC of 85 subjects without balance disorders or muscle enervation, allocating 14 to an unstable balance (USB) group and 20 to a stable balance (SB) group, and measured sway path length (SPL) and the area of envelope (AoE) body sway by one leg standing on the dominant leg of these 34 subjects.[Results] The AoE was significantly smaller in the SB group, but no significant difference was found in the SPL between the two groups.[Conclusion] The results suggest that since body sway was small when BC sitting ability was high, BC sitting can be used as an index to assess trunk cooperation.

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Effect of a Rope-walking Exercise on Balance Ability

Kimura

Tsuji

2012

Rigakuryoho kagaku

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Purpose] In this study, in order to determine the factors affecting the balance of sports players and ordinary subjects, we investigated the effects of dynamic transient skill training, using a rope, on eyes closed one leg standing time, and rope-walking distance and time.[Subjects] The subjects were 7 elite male ice hockey players, average age 21.3 years, and 9 ordinary male subjects, average age 24.7 years.[Method] The subjects practiced walking along a rope, and we measured eyes closed one leg standing time, and rope-walking distance and time before and after the training. To compare rope-walking distance and eyes closed one leg standing time, we used Student's t-test for within group comparisons, and Welch's t-test for between group comparisons.[Results] After the training, the ice hockey players' left leg eyes closed standing time, and rope-walking distance and time significantly increased, and the ordinary subjects' rope-walking distance and time very significantly increased. [Conclusion] We plan to develop a safe and effective balance training program.

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The Relationship between the Trunk Muscles Activities and Postural Sway during Unstable Sitting

Cited by 3 publications

References 9 publications

EMG measurement and cognitive test evaluation when using a balance ball toward the development of an office chair for preventing back pain

EMG measurement and cognitive test evaluation when using a balance ball toward the development of an office chair for preventing back pain

Relationship between the Ability to Sit on a Balance Cushion and Parameters of One Leg Standing

Effect of a Rope-walking Exercise on Balance Ability

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