The effect of load carriage on movement kinematics and respiratory parameters in children during walking

The objective of this study was to investigate the influence of different backpack weights on trunk kinematics and respiratory parameters during walking in 10-year-old children. Fifteen boys with a mean age of 10.31 (0.26) years were selected from a primary school to participate in four walking trials on a treadmill: one with a backpack of 0% of body mass, and three whilst carrying backpacks that weighed 10%, 15%, and 20% of the child's body mass. The walking speed was set at 1.1 m s-1 for 20 min duration. The walking movement was recorded on video and analysed in two dimensions. The breathing frequency, tidal volume, and respiratory muscles activity were measured with a cardiopulmonary system (Oxycon Champion, Jaeger) and a respiratory inductance plethysmograph (TR-601T, Nihon Kohden, Japan). A repeated ANOVA and Pearson correlation analysis were used to examine any significant differences in the measured parameters when comparing the different loads. The results showed a significant positive linear relationship between load weight, trunk inclination angle, and breathing frequency (P<0.01). Walking for 20 min, carrying a load that weighed 20% of body mass induced a significantly increased trunk inclination angle. A significant increase in ventilation during walking with a backpack of 15% and 20% of bodymass was associated with a more rapid breathing frequency. Walking with a backpack of 10% body mass did not significantly change trunk posture or respiratory parameters. However, the results suggested that walking with a backpack of greater than 10% body mass induced significant changes in trunk posture and respiratory parameters in 10-year-old children.

[1]  M. S. Malhotra,et al.  CARRYING OF SCHOOL BAGS BY CHILDREN , 1965 .

[2]  J. Mead,et al.  Measurement of the separate volume changes of rib cage and abdomen during breathing. , 1967, Journal of applied physiology.

[3]  G. Grimby,et al.  Respiratory muscle action inferred from rib cage and abdominal V-P partitioning. , 1976, Journal of applied physiology.

[4]  [Weight of schoolbags in a Freiburg elementary school. Recommendations to parents and teachers (author's transl)]. , 1979, Das Offentliche Gesundheitswesen.

[5]  P. Macklem,et al.  The ventilatory pump in exercise. , 1984, Clinics in chest medicine.

[6]  P. Macklem,et al.  Ventilatory muscles during exercise in air and oxygen in normal men. , 1984, Journal of applied physiology: respiratory, environmental and exercise physiology.

[7]  J. Kinney,et al.  The effects of posture on the metabolic and ventilatory response to low level steady state exercise. , 1986, Clinical science.

[8]  C. Gaultier,et al.  Breathing pattern during exercise in untrained children. , 1989, Respiration physiology.

[9]  K. Miyasaka,et al.  Analysis of Breathing Pattern in Children with Asthma , 1990, Acta paediatrica Japonica : Overseas edition.

[10]  D. Watson,et al.  Cervical Headache: An Investigation of Natural Head Posture and Upper Cervical Flexor Muscle Performance , 1993, Cephalalgia : an international journal of headache.

[11]  J. Verschakelen,et al.  Normal thoracoabdominal motions. Influence of sex, age, posture, and breath size. , 1995, American journal of respiratory and critical care medicine.

[12]  Youlian Hong,et al.  WALKING PATTERN ANALYSIS OF PRIMARY SCHOOL CHILDREN DURING LOAD CARRIAGES ON TREADMILL 492 , 1997 .

[13]  Y. T. Wang,et al.  Influence of carrying book bags on gait cycle and posture of youths. , 1997, Ergonomics.

[14]  B. Kirby,et al.  Prepubescents' ventilatory responses to exercise with reference to sex and body size. , 1997, Chest.

[15]  H. Yoshizaki,et al.  Effect of posture change on control of ventilation. , 1998, The Japanese journal of physiology.

[16]  K. Grimmer,et al.  The associations between adolescent head-on-neck posture, backpack weight, and anthropometric features. , 1999, Spine.

[17]  Youlian Hong,et al.  Effects of load carriage on heart rate, blood pressure and energy expenditure in children , 2000, Ergonomics.

[18]  Youlian Hong,et al.  Changes in gait patterns in 10-year-old boys with increasing loads when walking on a treadmill. , 2000, Gait & posture.

[19]  K. Grimmer,et al.  Effects of backpacks on students: measurement of cervical and shoulder posture. , 2001, The Australian journal of physiotherapy.

[20]  Stefano Negrini,et al.  Backpacks on! Schoolchildren’s Perceptions of Load, Associations With Back Pain and Factors Determining the Load , 2002, Spine.