Frank electrocardiograms were recorded in 426 schoolchildren (225 girl
s, 201 boys) aged 10 to 14 years, planar vectorcardiograms projected o
nto the horizontal and left sagittal planes were constructed. Spatial
magnitude of instantaneous QRS vector end-points in 10 ms intervals of
QRS duration, and of maximum QRS vector, as well as X, Y, Z coordinat
es of instantaneous QRS vector endpoints in 10 ms intervals of QRS dur
ation, and of the maximum QRS vector were analyzed in relation to weig
ht, height and BMI. The initial part of VCG loop was not influenced by
age and anthropometric parameters, respectively. The spatial QRS vect
or magnitude at the 30 ms of QRS decreased significantly with age and
height. From the 40 ms of QRS duration the VCG parameters were signifi
cantly related to anthropometric parameters. Vectorcardiographic param
eters were more influenced by the anthropometric parameters then by ag
e.