Children with Burn Injury Have Impaired Cardiac Output during Submaximal Exercise

Area of Science:

• Pediatric Cardiology
• Exercise Physiology
• Burn Trauma Research

Background:

• Burn trauma significantly impairs resting cardiac function in children.
• The impact of burn injury on cardiovascular responses during exercise remains largely unknown.
• This study investigates exercise hemodynamics in pediatric burn survivors.

Purpose of the Study:

• To test the hypothesis that burn injury lowers cardiac output (Q̇) and stroke volume (SV) during submaximal exercise in children.
• To compare the cardiovascular response to exercise between children with and without a history of significant burn trauma.
• To identify potential deficits in exercise capacity and hemodynamic function post-burn.

Main Methods:

• Five children with extensive burns (49% ± 4% BSA) and eight healthy controls participated.
• Participants underwent a graded exercise protocol with stages at 20 W and 50 W.
• Key variables measured included oxygen consumption (V̇O2), heart rate (HR), cardiac output (Q̇), and stroke volume (SV).

Main Results:

• Burned children exhibited a significantly lower cardiac output (Q̇) during submaximal exercise compared to controls (approx. 27% lower).
• Stroke volume (SV) did not increase from rest to exercise in burned children, unlike in controls.
• Heart rate (HR) response to exercise was also attenuated in the burn group.

Conclusions:

• Children with burn injuries demonstrate an attenuated cardiovascular response to submaximal exercise.
• These findings highlight potential long-term cardiovascular limitations in pediatric burn survivors.
• Further research into exercise hemodynamics is crucial for developing effective cardiovascular rehabilitation strategies for burned children.