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Exercise capacity in Dutch children: new reference values for the Bruce treadmill protocol.

M H M van der Cammen-van Zijp1, R J G van den Berg-Emons, S P Willemsen

  • 1Department of Physical Therapy, Subdivision Pediatric Physical Therapy, Erasmus MC-Sophia's Children's Hospital, Rotterdam, The Netherlands.

Scandinavian Journal of Medicine & Science in Sports
|May 9, 2009
PubMed
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Children's exercise capacity has declined, particularly in those under 10, according to new Dutch reference values. Factors like BMI and sports participation significantly impact endurance time in children.

Area of Science:

  • Pediatrics
  • Exercise Physiology
  • Public Health

Background:

  • Established Dutch reference values for exercise capacity using the Bruce treadmill protocol date back to 1987.
  • Potential declines in children's exercise capacity are suspected due to shifts in physical activity and dietary patterns.
  • Updated reference values and determinants of exercise capacity in children are needed.

Purpose of the Study:

  • To determine current reference values for maximal endurance time in healthy Dutch children aged 6-13 years.
  • To evaluate anthropometric and lifestyle factors influencing children's exercise capacity.
  • To compare current findings with previously established Dutch reference values.

Main Methods:

  • Cross-sectional observational study involving 267 healthy Dutch children aged 6-13 years.

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  • Maximal endurance time on the Bruce treadmill protocol was measured as the primary indicator of exercise capacity.
  • Data collected included anthropometry, smoking status, socioeconomic status, ethnicity, sports participation, and school transport habits.

    • Main Results:

    • Maximal endurance time was lower in children up to 10 years old compared to previous Dutch reference values (boys: 1.4 min less, girls: 1.6 min less).
    • Higher Body Mass Index (BMI) was negatively associated with endurance time (beta=-0.412, P<0.001).
    • Intense sports participation showed a positive association with endurance time (beta=0.789, P<0.001).

    Conclusions:

    • Exercise capacity appears to have decreased in Dutch children up to 10 years of age.
    • Reference values for older children (over 10) remained similar to those established in 1987.
    • BMI and engagement in intense sports are significant determinants of exercise capacity in children.