Mechanism of Dyspnea during Exercise in Children with Corrected Congenital Heart Disease

Mehdi Chlif, Mohamed Mustapha Ammar, Noureddine Ben Said, Levushkin Sergey, Said Ahmaidi, Fawaz Alassery and Habib Hamam
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Mehdi Chlif: EA 3300 “APS and Motor Patterns: Adaptations-Rehabilitation”, Picardie Jules Verne University, 80025 Amiens, France
Mohamed Mustapha Ammar: Exercise Physiology Department, College of Sport Sciences and Physical Activity, King Saud University, C.P. 22480, Riyadh 11495, Saudi Arabia
Noureddine Ben Said: Department of Biomechanics and Motor Behavior, College of Sport Sciences and Physical Activity, King Saud University, C.P. 22480, Riyadh 11495, Saudi Arabia
Levushkin Sergey: Federal State-Funded Scientific Institution “Institute of Developmental Physiology of the Russian Academy of Education”, Russian State University of Physical Culture, Sport, Youth and Tourism (SCOLIPE), 105122 Moscow, Russia
Said Ahmaidi: National Center of Medicine and Science in Sports (NCMSS), Tunisian Research Laboratory Sports Performance Optimization, Ave Med Ali Akid, El Menzah, Tunis 263, Tunisia
Fawaz Alassery: Department of Computer Engineering, College of Computers and Information Technology, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
Habib Hamam: Faculty of Engineering, Moncton University, Moncton, NB E1A 3E9, Canada

IJERPH, 2021, vol. 19, issue 1, 1-14

Abstract: This study will evaluate cardiorespiratory and peripheral muscle function and their relationship with subjective dyspnea threshold after the surgical correction of congenital heart disease in children. Thirteen children with surgically repaired congenital heart disease were recruited. Each participant performed an incremental exercise test on a cycle ergometer until exhaustion. Gas exchanges were continuously sampled to measure the maximal aerobic parameters and ventilatory thresholds. The functional capacity of the subjects was assessed with a 6 min walk test. At the end of the exercise test, isokinetic Cybex Norm was used to evaluate the strength and endurance of the knee extensor muscle in the leg. Dyspnea was subjectively scored with a visual analog scale during the last 15 s of each exercise step. Oxygen consumption measured at the dyspnea score/VO 2 relationship located at the dyspnea threshold, at which dyspnea suddenly increased. Results: The maximal and submaximal values of the parameters describing the exercise and the peripheral muscular performances were: VO 2 Peak: 33.8 ± 8.9 mL·min −1 ·kg −1 ; HR: 174 ± 9 b·min −1 ; VEmax: 65.68 ± 15.9 L·min −1 ; P max: 117 ± 27 W; maximal voluntary isometric force MVIF: 120.8 ± 41.9 N/m; and time to exhaustion Tlim: 53 ± 21 s. Oxygen consumption measured at the dyspnea threshold was related to VO 2 Peak (R 2 = 0.74; p < 0.01), Tlim (R 2 = 0.78; p < 0.01), and the distance achieved during the 6MWT (R 2 = 0.57; p < 0.05). Compared to the theoretical maximal values for the power output, VO 2 , and HR, the surgical correction did not repair the exercise performance. After the surgical correction of congenital heart disease, exercise performance was impeded by alterations of the cardiorespiratory function and peripheral local factors. A subjective evaluation of the dyspnea threshold is a reliable criterion that allows the prediction of exercise capacity in subjects suffering from congenital heart disease.

Keywords: dyspnea threshold; ventilatory threshold; congenital heart disease; exercise capacity (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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