The effect of backpack load on the posture of children and its relationship to trunk muscle activity during walking on a treadmill

作者: Farideh Babakhani

DOI: 10.22028/D291-23321

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摘要: The investigation began during the spring of 2009. subjects volunteered to participate from all across state Saarland through Saarbrucker Zeitung. Of total 76 subjects, 41 (23 girls and 18 boys) attended kindergarten while 35 (12 23 first grade in elementary school. Two were tested every day over course nine weeks, starting April 11th Their weight is then measured immediately 10, 20 30 % their body calculated be used later treadmill walk.The was made up three parts: a questionnaire, EMG video analysis kinematic posture. With increase backpack weight, trunk inclination angle progressively increased motion range decreased linearly.With distance floor earlobe joint (height) decreased.With at about 10 (BW) step length BW decreased. There an muscle activity upper trapezius as well median power frequency BW.This shows that there no fatigue body.With thoracic erector spine T12 lumbar spinae L3 existed for load conditions.There found conditions L3. The mean carried by children 4.1 kg, which around 16.7 weight.27.63 walked less than 1 km house door kindergarten/school, 28.95 approximately km, 43.42 more km. Die Untersuchung begann im Fruhjahr Die Probanden, aus dem gesamten stammend, beteiligten sich freiwillig nach einem Aufruf der Von den insgesamt Probanden gingen Madchen und Jungen) Kindergarten, wahrend die erste Klasse Grundschule besuchten.Die zusatzlichen Lasten des Schulranzen betrugen 0 %, Korpergewicht Kindes. Jede Belastungsstufe wurde fur 5 Minuten durchgefuhrt. ersten letzten Sekunden eines jeden Belastungszustandes wurden per Video sowie EMG-Signale aufgezeichnet.Die bestand drei Teilen: Fragebogen, einer EMG-Analyse Video-Analyse kinematischen Korperhaltung. Mit Zunahme Schulranzengewichts nimmt Rumpfwinkel schrittweise zu, das Bewegungsausmas hingegen linear ab.Mit Schulranzengewicht nahm Korperhohe (Abstand vom Boden zu Ohrlappchen) ab.Bei Gewichtszunahme auf Korpergewichts hat Schrittlange zugenommen, bei Belastung mit Korperge-wichts sie abgenommen. Es gab eine Muskelaktivitat beim oberen Trapezius Belastung.Dies zeigt, dass es keine Muskelermudung Upper gibt.Mit Medianfrequenz (MPF) Thoracic Erector ab.Es allen Belastungsstufen festgestellt. Das Mittelwert Kindern betrug 4,1 durchschnittlich 16,7 ihres entsprech. 27,6 Kinder hatten einen Weg von Haustur bis zur Schule/zum weniger als betrug, 28,9 er ungefahr 43,4 war langer

参考文章(208)
J Maxwell Donelan, Rodger Kram, Arthur D Kuo, None, Mechanical work for step-to-step transitions is a major determinant of the metabolic cost of human walking The Journal of Experimental Biology. ,vol. 205, pp. 3717- 3727 ,(2002) , 10.1242/JEB.205.23.3717
S. J. LEGG, L. PERKO, P. CAMPBELL, Subjective perceptual methods for comparing backpacks Ergonomics. ,vol. 40, pp. 809- 817 ,(1997) , 10.1080/001401397187801
Peter M. Quesada, Larry J. Mengelkoch, Robert C. Hale, Sheldon R. Simon, Biomechanical and metabolic effects of varying backpack loading on simulated marching. Ergonomics. ,vol. 43, pp. 293- 309 ,(2000) , 10.1080/001401300184413
Christa Devroey, Ilse Jonkers, An de Becker, Gerlinde Lenaerts, Arthur Spaepen, Evaluation of the effect of backpack load and position during standing and walking using biomechanical, physiological and subjective measures Ergonomics. ,vol. 50, pp. 728- 742 ,(2007) , 10.1080/00140130701194850
S. H. Roy, C. J. De Luca, J. Schneider, Effects of electrode location on myoelectric conduction velocity and median frequency estimates Journal of Applied Physiology. ,vol. 61, pp. 1510- 1517 ,(1986) , 10.1152/JAPPL.1986.61.4.1510
Hanie Nadia Shasmin, N. A. Abu Osman, R. Razali, J. Usman, W. A. B Wan Abas, A Preliminary Study of Acceptable Load Carriage for Primary School Children Springer, Berlin, Heidelberg. pp. 171- 174 ,(2007) , 10.1007/978-3-540-68017-8_44
Kevin G. Keenan, Dario Farina, Katrina S. Maluf, Roberto Merletti, Roger M. Enoka, Influence of amplitude cancellation on the simulated surface electromyogram. Journal of Applied Physiology. ,vol. 98, pp. 120- 131 ,(2005) , 10.1152/JAPPLPHYSIOL.00894.2004
A. Rohlmann, L. E. Claes, G. Bergmann, F. Graichen, P. Neef, H.-J. Wilke, Comparison of intradiscal pressures and spinal fixator loads for different body positions and exercises Ergonomics. ,vol. 44, pp. 781- 794 ,(2001) , 10.1080/00140130120943
E.A. Clancy, N. Hogan, Probability density of the surface electromyogram and its relation to amplitude detectors IEEE Transactions on Biomedical Engineering. ,vol. 46, pp. 730- 739 ,(1999) , 10.1109/10.764949