Abstract
Backpacks are essential for travel but carrying a load during a long journey can easily cause muscle fatigue and joint injuries. Previous studies have suggested that suspended backpacks can effectively reduce the energy cost while carrying loads. Researchers have found that adjusting the stiffness of a suspended backpack can optimize its performance. Therefore, this paper proposes a stiffness-adjustable suspended backpack; the system stiffness can be adjusted to suitable values at different speeds. The stiffness of the suspended backpack with a 5-kg load was designed to be 690 N/m for a speed of 4.5 km/h, and it was adjusted to 870 and 1050 N/m at speeds of 5.5 and 6.5 km/h, respectively. The goal of this study was to determine how carrying a stiffness-adjustable suspended backpack affected performance while carrying a load. Six healthy participants participated in experiments where they wore two backpacks under three conditions: the adjustable-stiffness suspended backpack condition (S_A), the unadjustable-stiffness suspended backpack condition (S_UA), and the ordinary backpack condition (ORB). Our results showed that the peak accelerations, muscle activities, and peak ground reaction forces in the S_A condition were reduced effectively by adjusting the stiffness to adapt to different walking speeds; this adjustment decreased the metabolic cost by 4.21 ± 1.21% and 2.68 ± 0.88% at 5.5 km/h and 4.27 ± 1.35% and 3.38 ± 1.31% at 6.5 km/h compared to the ORB and S_UA, respectively.
Issue Section:
Research Papers
References
1.
Knapik
,
J.
,
Harman
,
E.
, and
Reynolds
,
K.
, 1996
, “
Load Carriage Using Packs: A Review of Physiological, Biomechanical and Medical Aspects
,” Appl. Ergon.
,
27
(3
), pp. 207
–216
.10.1016/0003-6870(96)00013-02.
Rome
,
L. C.
,
Flynn
,
L.
, and
Yoo
,
T. D.
, 2006
, “
Rubber Bands Reduce the Cost of Carrying Loads
,” Nature
,
444
(7122
), pp. 1023
–1024
.10.1038/4441023a3.
Tang
,
Z.
,
Sun
,
S.
,
Wang
,
J.
, and
Zhang
,
K.
, 2014
, “
An Ergonomics Evaluation of the Vibration Backpack Harness System in Walking
,” Int. J. Ind. Ergonom.
,
44
(5
), pp. 753
–760
.10.1016/j.ergon.2014.08.0044.
Arghami
,
S.
,
Moshayedi
,
M.
, and
Rahim Ziad
,
I.
, 2016
, “
Multi-Purpose Ergonomic Backpack for High School Students
,” J. Hum. Environ. Health Promot.
,
1
(3
), pp. 159
–165
.https://applications.emro.who.int/imemrf/J_Hum_Environ_Health_Promot/J_Hum_Environ_Health_Promot_2016_1_3_159_165.pdf5.
Putra
,
N. K.
, and
Sriwarno
,
A. B.
, 2010
, “
Dynamic Modeling and Simulation of the Suspended-Load Backpack to Obtain Optimal Suspension Parameters and Reducing Effect of Ground Reaction Force
,” 6th World Congress of Biomechanics (WCB 2010)
, Springer, Singapore, Aug. 1–6, pp. 111
–114
.10.1007/978-3-642-14515-5_296.
Kram
,
R.
, 1991
, “
Carrying Loads With Springy Poles
,” J. Appl. Physiol.
,
71
(3
), pp. 1119
–1122
.10.1152/jappl.1991.71.3.11197.
Castillo
,
E. R.
,
Lieberman
,
G. M.
,
McCarty
,
L. S.
, and
Lieberman
,
D. E.
, 2014
, “
Effects of Pole Compliance and Step Frequency on the Biomechanics and Economy of Pole Carrying During Human Walking
,” J. Appl. Physiol.
,
117
(5
), pp. 507
–517
.10.1152/japplphysiol.00119.20148.
Schroeder
,
R. T.
,
Croft
,
J. L.
,
Ngo
,
G. D.
, and
Bertram
,
J. E. A.
, 2018
, “
Properties of Traditional Bamboo Carrying Poles Have Implications for User Interactions
,” PLoS One
,
13
(5
), p. e0196208
.10.1371/journal.pone.01962089.
Potwar
,
K.
,
Ackerman
,
J.
, and
Seipel
,
J.
, 2015
, “
Design of Compliant Bamboo Poles for Carrying Loads
,” ASME J. Mech. Des.
,
137
(1
), p. 011404
.10.1115/1.402875710.
Xu
,
Y.
,
Yang
,
L.
,
Chen
,
K.
,
Zhang
,
J.
, and
Fu
,
C.
, 2019
, “
Energetics of Load Carriage by Bamboo Carrying Poles
,” ASME
Paper No. IMECE2019-10584 .10.1115/IMECE2019-1058411.
Hoover
,
J.
, and
Meguid
,
S. A.
, 2011
, “
Performance Assessment of the Suspended-Load Backpack
,” Int. J. Mech. Mater. Des.
,
7
(2
), pp. 111
–121
.10.1007/s10999-011-9153-712.
Ackerman
,
J.
, and
Seipel
,
J.
, 2014
, “
A Model of Human Walking Energetics With an Elastically-Suspended Load
,” J. Biomech.
,
47
(8
), pp. 1922
–1927
.10.1016/j.jbiomech.2014.03.01613.
Leng
,
Y.
,
Lin
,
X.
,
Yang
,
L.
,
Xu
,
Y.
, and
Fu
,
C.
, 2020
, “
Design of an Elastically Suspended Backpack With Tunable Stiffness
,” Fifth International Conference on Advanced Robotics and Mechatronics (ICARM
),
IEEE
, Shenzhen, China, Dec. 18–21, pp. 359
–363
. 10.1109/ICARM49381.2020.919529014.
Yang
,
L.
,
Xu
,
Y.
,
Zhang
,
J.
,
Chen
,
K.
, and
Fu
,
C.
, 2019
, “
Design of an Elastically Suspended Backpack With a Tunable Damper
,” IEEE International Conference on Advanced Robotics and Its Social Impacts (ARSO
), Beijing, China, Oct. 31–Nov. 2, pp. 180
–185
.10.1109/ARSO46408.2019.894876315.
Park
,
J. H.
,
Stegall
,
P.
,
Zhang
,
H.
, and
Agrawal
,
S.
, 2017
, “
Walking With a Backpack Using Load Distribution and Dynamic Load Compensation Reduces Metabolic Cost and Adaptations to Loads
,” IEEE Trans. Neural Syst. Rehabil. Eng.
,
25
(9
), pp. 1419
–1430
.10.1109/TNSRE.2016.262705716.
He
,
L.
,
Xiong
,
C.
,
Zhang
,
Q.
,
Chen
,
W.
,
Fu
,
C.
, and
Lee
,
K. M.
, 2020
, “
A Backpack Minimizing the Vertical Acceleration of the Load Improves the Economy of Human Walking
,” IEEE Trans. Neural Syst. Rehabil. Eng.
,
28
(9
), pp. 1994
–2004
.10.1109/TNSRE.2020.301197417.
Ackerman
,
J.
, and
Seipel
,
J.
, 2013
, “
Energy Efficiency of Legged Robot Locomotion With Elastically Suspended Loads
,” IEEE Trans. Rob.
,
29
(2
), pp. 321
–330
.10.1109/TRO.2012.223569818.
Huang
,
L.
,
Yang
,
Z.
,
Wang
,
R.
, and
Xie
,
L.
, 2020
, “
Physiological and Biomechanical Effects on the Human Musculoskeletal System While Carrying a Suspended-Load Backpack
,” J. Biomech.
,
108
, p. 109894
.10.1016/j.jbiomech.2020.10989419.
Xie
,
L.
, and
Cai
,
M.
, 2015
, “
Increased Energy Harvesting and Reduced Accelerative Load for Backpacks Via Frequency Tuning
,” Mech. Syst. Signal Process.
,
58–59
, pp. 399
–415
.10.1016/j.ymssp.2015.01.01220.
Li
,
D.
,
Li
,
T.
,
Li
,
Q.
,
Liu
,
T.
, and
Yi
,
J.
, 2016
, “
A Simple Model for Predicting Walking Energetics With Elastically-Suspended Backpack
,” J. Biomech.
,
49
(16
), pp. 4150
–4153
.10.1016/j.jbiomech.2016.10.03721.
Foissac
,
M.
,
Millet
,
G. Y.
,
Geyssant
,
A.
,
Freychat
,
P.
, and
Belli
,
A.
, 2009
, “
Characterization of the Mechanical Properties of Backpacks and Their Influence on the Energetics of Walking
,” J. Biomech.
,
42
(2
), pp. 125
–130
.10.1016/j.jbiomech.2008.10.01222.
Prasad
,
L.
, 1995
, Handbook of Mechanical Design
,
Tata McGraw-Hill Education
, New Delhi.23.
Davidovits
,
P.
, 2019
, “
Chapter 1—Static Forces
,” Physics in Biology and Medicine
, 5th ed.,
P.
Davidovits
, ed.,
Academic Press
, India, pp. 1
–20
.24.
Yuhe
,
W. G. L. Y. L.
, and
Qing
,
H.
, 2013
, “
Faulty Rotor System Vibration Acceleration Signal Integration Method Based on Precise Information Reconstruction
,” J. Mech. Eng.,
p. 08
.10.3901/JME.2013.08.00125.
Brockway
,
J. M.
, 1987
, “
Derivation of Formulae Used to Calculate Energy Expenditure in Man
,” Human Nutr. Clin. Nutr.
,
41
(6
), pp. 463
–471
.https://pubmed.ncbi.nlm.nih.gov/3429265/26.
Knapik
,
J. J.
,
Reynolds
,
K. L.
, and
Harman
,
E.
, 2004
, “
Soldier Load Carriage: Historical, Physiological, Biomechanical, and Medical Aspects
,” Milit. Med.
,
169
(1
), pp. 45
–56
.10.7205/MILMED.169.1.4527.
Stuempfle
,
K. J.
,
Drury
,
D. G.
, and
Wilson
,
A. L.
, 2004
, “
Effect of Load Position on Physiological and Perceptual Responses During Load Carriage With an Internal Frame Backpack
,” Ergon.
,
47
(7
), pp. 784
–789
.10.1080/001401304200019326428.
Bobet
,
J.
, and
Norman
,
R.
, 1984
, “
Effects of Load Placement on Back Muscle Activity in Load Carriage
,” Eur. J. Appl. Physiol. Occup. Physiol.
,
53
(1
), pp. 71
–75
.10.1007/BF0096469329.
Keren
,
R.
, and
Or
,
Y.
, 2018
, “
Energy Performance Analysis of a Backpack Suspension System With a Timed Clutch for Human Load Carriage
,” Mech. Mach. Theory
,
120
, pp. 250
–264
.10.1016/j.mechmachtheory.2017.09.02130.
Yang
,
L.
,
Zhang
,
J.
,
Xu
,
Y.
,
Chen
,
K.
, and
Fu
,
C.
, 2020
, “
Energy Performance Analysis of a Suspended Backpack With an Optimally Controlled Variable Damper for Human Load Carriage
,” Mechanism Mach. Theory
,
146
, p. 103738
.10.1016/j.mechmachtheory.2019.10373831.
Ackerman
,
J.
, and
Seipel
,
J.
, 2011
, “
Coupled-Oscillator Model of Locomotion Stability With Elastically-Suspended Loads
,” ASME
Paper No. DETC2011-48828.10.1115/DETC2011-4882832.
Anderson
,
F. C.
, and
Pandy
,
M. G.
, 2001
, “
Static and Dynamic Optimization Solutions for Gait Are Practically Equivalent
,” J. Biomech.
,
34
(2
), pp. 153
–161
.10.1016/S0021-9290(00)00155-X33.
Thelen
,
D. G.
,
Anderson
,
F. C.
, and
Delp
,
S. L.
, 2003
, “
Generating Dynamic Simulations of Movement Using Computed Muscle Control
,” J. Biomech.
,
36
(3
), pp. 321
–328
.10.1016/S0021-9290(02)00432-334.
Simpson
,
K. M.
,
Munro
,
B. J.
, and
Steele
,
J. R.
, 2011
, “
Backpack Load Affects Lower Limb Muscle Activity Patterns of Female Hikers During Prolonged Load Carriage
,” J. Electromyogr. Kinesiol.
,
21
(5
), pp. 782
–788
.10.1016/j.jelekin.2011.05.01235.
Shelburne
,
K. B.
,
Torry
,
M. R.
, and
Pandy
,
M. G.
, 2006
, “
Contributions of Muscles, Ligaments, and the Ground‐Reaction Force to Tibiofemoral Joint Loading During Normal Gait
,” J. Orthop. Res.
,
24
(10
), pp. 1983
–1990
.10.1002/jor.2025536.
Hamner
,
S. R.
,
Seth
,
A.
, and
Delp
,
S. L.
, 2010
, “
Muscle Contributions to Propulsion and Support During Running
,” J. Biomech.
,
43
(14
), pp. 2709
–2716
.10.1016/j.jbiomech.2010.06.02537.
Birrell
,
S. A.
,
Hooper
,
R. H.
, and
Haslam
,
R. A.
, 2007
, “
The Effect of Military Load Carriage on Ground Reaction Forces
,” Gait Posture
,
26
(4
), pp. 611
–614
.10.1016/j.gaitpost.2006.12.00838.
Xu
,
X.
,
Hsiang
,
S. M.
, and
Mirka
,
G. A.
, 2009
, “
The Effects of a Suspended-Load Backpack on Gait
,” Gait Posture
,
29
(1
), pp. 151
–153
.10.1016/j.gaitpost.2008.06.008 Copyright © 2022 by ASME
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