Abstract：
:The purpose of the present study is to analyze trunk-lower extremity muscle activities and trunk postural changes during the carriage of different backpacks. Nineteen male university students (21+/-3 years) participated in the experiment's four standing modes: (1) unloaded standing, (2) 10% body weight (BW) load (in the form of a backpack), (3) 15% BW load and (4) 20% BW load. Bilateral rectus abdominis, erector spinae, vastus medialis and biceps femoris muscle activities were recorded using surface electromyography (SEMG), while trunk inclination, side flexion and rotation were measured by using VICON 250 during all standing modes. The results showed that rectus abdominis muscle activities increased progressively and disproportionably as the backpack load increased. As for the trunk posture, almost the same backward inclination was adapted even with increasing backpack heaviness. Twenty percent BW backpack causes the most significant muscular and postural changes so it should be avoided. However, it is recommended to study other backpack factors such as frequency of usage, usage time, type of the backpack and age to come up with a complete usage recommendation.
journal_name
Gait Posturejournal_title
Gait & postureauthors
Al-Khabbaz YS,Shimada T,Hasegawa Mdoi
10.1016/j.gaitpost.2008.01.002subject
Has Abstractpub_date
2008-08-01 00:00:00pages
297-302issue
2eissn
0966-6362issn
1879-2219pii
S0966-6362(08)00025-8journal_volume
28pub_type
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