Analysis of human object lifting operation force using power assist device

We carry various objects at the work site. At that time, you may have a heavy object, which requires muscular strength. However, setting such restrictions reduces the number of people who can participate in the work. Therefore, I think that it can be improved by using a power assist device. However, the power assist device has a problem in operability. When we use an assist device to lift an object, we feel sensation different than usual. At that time, we can feel discomfort and unstable. Analyze what kind of operation is performed when a person feels uncomfortable. For that purpose, we set a weight and some lifting conditions and conducted an experiment.

Spatial distribution of erector spinae activity is related to task-specific pain-related fear during a repetitive object lifting task

ABSTRACTFear-avoidance beliefs, particularly the fear of lifting an object with a flexed spine, were shown to be associated with reduced spinal motion during object lifting in both individuals with and without low back pain (LBP). LBP patients thereby also showed potentially clinically relevant changes in the spatial distribution of back muscle activity, but it remains unknown whether such associations are also present in pain-free individuals. The aim of this study was therefore to investigate the relationship between fear-avoidance beliefs and the change in spatial distribution of lumbar paraspinal muscle activity in pain-free individuals during a repetitive object lifting task. Thirty participants completed two pain-related fear questionnaires and performed 25 repetitions of lifting a 5kg-box from a lower to an upper shelf and back, while multi-channel electromyographic signals were recorded bilaterally from the lumbar erector spinae muscles. Changes in spatial distribution were determined by calculating the differences in vertical position of the weighted centroids of muscle activity (centroid shift) between the first and last few repetitions. Multiple linear regression analyses were performed to examine the relationship between the centroid shift and fear-avoidance belief scores. The analyses showed that the fear of lifting an object with a flexed spine was negatively associated with erector spinae activity centroid shift (R2 adj. = 0.1832; p = 0.045), which might be an expression of behavioral alterations in order to prevent the back from possible harm.

ARCHAEOLOGICAL SURVEY OF THE LATE BRONZE AGE CHEKANOVSKY LOG-1 SETTLEMENT IN ALTAI FOOTLAND IN AUTUMN 2020

The article is devoted to the results of the survey of the archaeological heritage site “Chekanovsky Log-1 settlement” located on the right bank of the Alei river which currently belongs to the northern coastline of the Gilevsky reservoir in the Tretyakovsky district of the Altai Territory. During the exploration, the archaeological complex was examined for destruction, an eye plan was drawn up, and a general description of the current state of the monument was made. On the eroded part of the object, lifting material was collected, which was ceramics of the Late Bronze Age, presumably related to the Sargarin-Alekseevsk culture, as well as a fragment of a grater or grain grater. Based on the results of the measures taken, it is possible to draw a conclusion about the emergency state of the object, which is supported by the erosion of the surf line due to the activity of the reservoir. Significant anthropogenic impact is associated with the use of its area as a place for recreation and agricultural needs. Keywords: foothill Altai, Lower Bronze Age, Sargarin-Alekseevskaya culture, archaeological monitoring

The role of the anterior intraparietal sulcus and the lateral occipital cortex in fingertip force scaling and weight perception during object lifting

This article provides new insights into the neural mechanisms underlying object lifting and perception. Using transcranial magnetic stimulation during object lifting, we show that effects of previous experience on force scaling and weight perception are not mediated by the anterior intraparietal sulcus or the lateral occipital cortex (LO). In contrast, we highlight a unique role for LO in load force scaling, suggesting different brain processes for grip and load force scaling in object manipulation.