Performance and Muscle Oxygenation during Isometric Exercise and Recovery in Children with Congenital Heart Diseases

Abstract

This study investigated performance, muscle oxygen saturation (StO₂), and blood volume (BV) in patients with congenital heart diseases (CHD) and healthy children during and following sustained exercise. Maximal volunteered contraction (MVC) and endurance at 50 % of MVC (time to exhaustion, Tlim) of the knee extensor were measured in nine patients with CHD and 14 healthy control children. Near infrared spectroscopy was used to evaluated StO₂ and BV in vastus lateralis. The drop in muscle oxygen saturation (D_mO2), half time of recovery (T_œR), and recovery speed to maximal oxygen saturation (R_s) were analyzed. Patients with CHD showed lower MVC (101.0 ± 6.2 vs. 125.5 ± 7.4 N · m, p < 0.01) and Tlim (67.0 ± 7.5 vs. 127.5 ± 11.1 s, p < 0.001) than control children. StO₂ and BV values in both groups were similar at rest and decreased at the onset of contraction. D_mO2 was larger in patients, which reflected pronounced deoxygenation. During recovery, the patients exhibited a longer T_œR (25.2 ± 2.1 vs. 18.4 ± 2.0 s, p < 0.05) and R_S (64.6 ± 5.5 vs. 42.7 ± 4.6 s, p < 0.01) than control children. We concluded that reduced strength and endurance in patients with CHD were associated with an impairment of StO₂ and BV, and a slower reoxygenation during recovery.

Key words

Blood volume - Cybex - MVC - NIRS

References

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