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1- MSc Student of Ergonomics, Department of Occupational Health and Ergonomics, Urmia University of Medical Sciences , Urmia, Iran.
2- Full Professor, Social Determinants of Health Research Center, Occupational Medicine Center, Urmia University of Medical Sciences , Urmia, Iran.
3- Assistant Professor, Department of Physical Therapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. , fa.azadi@uswr.ac.ir
4- Associated Professor, Department of Ergonomics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Abstract:   (241 Views)
Objectives: With respect to the decline in the performance of balance control system in older adults and the importance of active aging, maintening independency during daily activities such as buying, holding and carrying an external load is very important. The aim of this study was to determine the effect  of the load magnitude and  the handling mode on the postural sway while quiet standing , so that finally the amount and manner of safe manoual load can be recommended to the older adults without the risk of falling.
Methods&Materials:In this quasi experimental study , 15 healthy older people living in the community, including 7 men and 8 women aged 65 years and above with mean and standard deviation 71.53  ± 6/18 years  who were independent in daily living  such as  buying and carrying shopping bags were enrolled in  this study  using  simple non-probability sampling method . External loading was based on body mass include 0%, 5%, 10%, 15%, and 20% , symmetrically and asymmetrically recorded while quite standing on a force plate that measured displacement of the center of pressure (COP) in anteroposterior and mediolateral directions, area and velocity of COP.
Results:
The results of research revealed significant symmetrically and asymmetrically and load magnitude effects for COP in anterior- posterior direction (COPAP) and COP velocity, while the interaction effect of these two factors for none of the variables were not significant. In paired t-test, the displacement and velocity of the center of pressure in anteroposterior direction in asymmetric loading conditions (dominant or non-dominant) was significantly different compared to the symmetrical   condition (two hand), but between two asymmetrical conditions (dominant to non- dominant) was not significant. COPAP 0% compared to 5%, 10%, 15% and 20% of body mass, showed significantly different ( all P< 0.05). In the mediolateral direction, none of the variables had a statistically significant difference.
 Conclusion: The results of this study showed that asymmetrical manual external load, regardless of its magnitude, increases the displacement and velocity of the center of pressure in the anterior-posterior direction. From a fall prevention perspective, the older adults are advised to pay attention to the fact that holding an external load with two hands less than one hand challenges the balance control system, and there is no difference between dominant and non-dominant hands. In terms of load magnitude, even an external load as large as 5% of body mass can challenge the balance control system compared to the situation without external load, and other than some exceptions, the difference between loads with magnitude of 5%, 10%, 15% and 20% do not exist.
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Type of Study: Research | Subject: Ergonomics
Received: 2021/09/04 | Accepted: 2021/10/04

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