Prevalence and determinants of low QRS voltages and QRS fragmentation in children and adolescents undergoing sports preparticipation screening.

LQRSV in limb leads and FQRSV in ≥2 contiguous leads excluding V1-V2 are rare in young apparently healthy athletes and are not related to the type and intensity of sport activity. Therefore, they may require additional testing to rule out an underlying disease particularly when other abnormalities are present.