Psychophysical and physiological study of asymmetric lifting and lowering task for Malaysian males
- Author:
Mirta Widia, Siti Zawiah Md Dawal and NukmanYusoff
- Publication Type:Journal Article
- Keywords:
Lifting and lowering task;
load;
frequency;
psychophysical;
physiological Malaysian male
- From:Malaysian Journal of Public Health Medicine
2016;16(Supplement 2):99-105
- CountryMalaysia
- Language:English
-
Abstract:
Extensive research has been carried out over the years to determine the maximum acceptable weight that a worker
is capable of lifting in a given situation among the Occidental populations in the Europe and US. At present, there is
a scarcity of studies in which lifting frequency is used as the measuring variable, especially in developing countries
such as Malaysia. Therefore, the objective of this study is to determine the effects of lifting loads on the maximum
acceptable frequency limit (MAFL), physiological response (muscle activity) and rating of perceived exertion (RPE)
for asymmetric lifting and lowering tasks of Malaysian males.Ten male subjects are recruited in this study and they
perform asymmetric lifting and lowering tasks repetitively for 30 minutes. Two lifting loads are considered (1) 1 kg
and (2) 5 kg. Each of the subjects adjusts his frequency of lifting using a psychophysical approach. The subjects are
instructed to perform the lifting and lowering task as fast as they could over duration of 30 minutes without
exhausting themselves or becoming overheated. Electromyography (EMG) signals are recorded from four muscles
(Right Erector Spinae (RES), Left Erector Spinae (LES), Right Trapezius p Descendenz (RTD) and Left Trapezius p
Descendenz (LTD) and analysed in terms of the normalized MVC during asymmetric lifting and lowering tasks. The
ratings of perceived exertion (RPE) for four body parts (arms, lower back, shoulders and entire body) are also
collected after the subjects have completed the lifting and lowering task. The mean frequency of the lifting and
lowering task obtained from the experiment is 13.41 and 9.66 times/minute for a lifting load of 1 and 5 kg,
respectively. The results of the independent sample t-test show that load has a statistically significant effect on the
maximum acceptable frequency limit (p < 0.05). However, it is found that even though there is an increase in muscle
activity and RPE with an increase in lifting load, there is no significant difference in the overall mean muscle activity
and RPE (p > 0.05). The percentage decrease in the maximum acceptable frequency for Malaysian males is higher
than the Occidental populations for both of the loads investigated in this study.
- Full text:P020170126560338065147.pdf