Introduction:
Childhood cancer treatment is aggressive and may lead to a significant limitation of physical activity as well as deterioration of children’s quality of life. Anticancer treatment, though it saves health and life, also leads to problems resulting from the lack of sufficient physical activity. The aim of the study was to assess the level of the physical activity and quality of life in children undergoing leukaemia treatment and examine if there was a correlation between these two.

Methods:
Anonymous surveys were conducted. The quality of children’s lives was assessed with the KIDSCREEN-10 questionnaire. The level of physical activity was determined with the use of questions from the Health Behaviour in School-aged Children (HBSC) questionnaire.

Results:
A study group of 30 children undergoing stationary leukaemia treatment and a control group of 30 healthy children were examined. None of the treated children made a physical effort lasting at least 60 minutes a day; 77% of them did not perform any intense physical effort. All the children undergoing leukaemia treatment showed malaise and low quality of life. No correlation was observed between the level of physical activity and life quality among the oncologically treated children.

Conclusions:
Children treated for leukaemia had a low level of physical activity and life quality. They did not undertake any form of physical activity contributing to the improvement of parameters of exercise capacity. There was no correlation between the level of physical activity and life quality in children treated for leukaemia.