The Effect on the Asymmetric load of Bag Weights for Dynamic Postural Stability Index & Center of Pressure Variables during Level Walking


[Thesis] Asymmetric Bag Weight & Posture (Center of Pressure)


This purpose of this study was to analyze the effect on the asymmetric load of bag weights for dynamic postural stability index & Center of Pressure variables during level walking. Participants selected as subject were consisted of young women(n=10), divided into the kinds of 3 bag weights(0kg, 3kg, 5kg).. Analyzed GRF variables during gait were medial-lateral (ML), anterior-posterior(AP), vertical(V), dynamics postural stability index(DPSI), ΔCOPx, ΔCOPy, COP area, medial-lateral(M-L), anterior-posterior(A-P) deviation of venter of pressure. The results analyzed from the above were as follows; 1. MLSI, APSI, VSI and DPSI didn`t show significant different statistically according to increase of bag weights, But, 5kg bag weight showed more decrease in dynamics postural stability index than that 0kg, 3kg bag weights during level walking. 2. Among variables of center of pressure, 5kg bag weight showed more linear relationship in pathway than that of 0kg, 3kg bag weights in ΔCOPx. Also, COP area showed increasing tendency according to decrease of bag weights. 3. M-L COPD didn`t show significant different statistically according to increase of bag weights, finally A-P COPD showed significant difference statistically in dynamic postural according to increase of bag weights.

Correlation between Perceived Backpack Weight and Musculoskeletal Pain for Elementary School Children

[Thesis] Backpack and Back Pain Relationship for Elementary School Kids

A research done in Korea...

[Thesis] Optimal Weight of Satchel in Walking

The optimal weight of satchel in walking is 15% of individual body weight.


I just felt like researching some papers related to leatherworking and leather bags. Couldn't find the exact info... but here is one piece of info I liked.

An Old But Interesting Study Done in Korea

A Kinesiological Study on Taking Methods and Weights of a Satchel for the Elementary School Children


The aims of this study is to decide optimal weight and taking methods a satchel with analyzing walking posture and energy expenditure in case of several weights of satchel. The subjects were selected at random 10 children of 10 years old from some element schools located in Hirazuka City, Kanakawa-Ken, Japan. It made an experiment in natural walking on the tread-mill at 60M per minutes with a following condition: that is (1) walking without and loading (2) walking with taking on back a satchel loading of 2, 4, 6, 8㎏. (3) walking with taking on hand a satchel loading of 4㎏. Under above mentioned condition, it were taken a picture of walking posture with 16mm Bolex Camera and measured energe metabolism. The results of analyzing these data were as follows: 1. The length of step (1) It gets long for length of step according to increasing in weight of satchel but in case of weight more than 8㎏, it gets short for length of step. (2) It is shorter in length of step for taking on hand satchel than taking on back satchel. 2. Forurard and roiling pitch (1) It gets large in forward pitch of head part according to incresing in weight of satchel. (2) It is smaller in forward Pitch for taking on hand a satchel than taking on back a satchel. (3) It is larger in rolling pitch of trunk arid head Part for light loading than heading than heavy loading, but it gets constant in case of weight more than 4㎏. 3. Oxygen Consumption (1) It gets increased in oxygen consumption according in weight of a satchel, but in phase of walking efficiency, it is smallest in case of loading of 2㎏ and almost similar in case of non loading and loading of 4㎏. (2) It is larger in oxygen consumption for taking on hand a satchel than taking on bark a satchel. 4. Energy Expenditure (1) It gets increased in energy expenditure according to increasing in weight of a satchel, especially it gets conspicuously increased in case of loading of 6㎏. (2) It is larger in energy expenditure for taking on back a satchel than taking on hand a satchel. 5. R.M.R. (1) It gets mostly large in R.M.R. according to increasing in weight of a satchel, especially. it gets conspicuously large in case of weight more than 4㎏. (2) It is largest of all case for taking on hand a satchel in R.M.R., that is 3.00. 6. The optimal weight of satchel in walking is 15% of individual body weight. 7. It is more beneficial in walking far taking on back a satchel than taking on hand in phase of energy expenditure and forming posture.