Physiological Effect on Different Reach Distances: A Case Study for Malaysia Adults

Abstract

The effects of oxygen uptake, heart rate and muscle activity while performing a repetitive lifting task in normal, maximum and extreme reach distances were investigated in the study. Ten subjects (5 females and 5 males) of age between 22-25 years were involved in the study. The results of oxygen uptake showed an increased of 11% and 39% from normal reach to maximum and extreme reach respectively. As for heart rate the results showed an increased of 8% and 17% from normal reach to maximum and extreme reach respectively. Electromyogram reading of anterior deltoid and upper trapezious muscles showed a tremendous increased of more than 80% while bicep brachii muscles showed an increase of only about 1 % from normal reach. The findings from the study showed an increased in the physiological responses when the work reach distance was increased. And lifting task, posture and load on this study developed back pain. Kesan pengambilan oksigen, kadar degupan jantung dan aktiviti otot ketika melaksanakan kerja mangangkat secara berulang pada kadar normal, maximum dan capaian melampau telah dikaji dalam kajian ini. Sepuluh orang peserta kajian, lima perempuan dan lima lelaki yang berumur antara 22-25 tahun terlibat dalam kajian ini. Keputusan kajian terhadap pengambilan oksigen menunjukkan kadar peningkatan sebanyak 11% dan 39% dari kadar normal untuk mencapai kadar maximum dan capaian melampau. Manakala untuk kadar degupan jantung keputusan menunjukkan peningkatan sebanyak 8% dan 17% dari keadaan normal untuk mencapai kadar maximum dan capaian melampau. Bacaan electromyogram pada anterior deltoid dan otot bahagian atas trapezious menunjukkan peningkatan yang besar iaitu sebanyak 80% manakala otot bicep brachii menunjukkan peningkatan sebanyak 1% sahaja dari keadaan normal. Penemuan dalam kajian ini menunjukkan peningkatan dalam tindak balas psikologikal apabila jarak capaian kerja meningkat. Dan pekerjaan mengangkat, postur dan beban dalam kajian ini mengakibatkan sakit belakang badan