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Effect of high-intensity interval training in adolescents with asthma: The eXercise for Asthma with Commando Joe's® (X4ACJ) trial
Journal of Sport and Health Science, Volume: 10, Issue: 4, Pages: 488 - 498
Swansea University Authors: Charles Winn, Kelly Mackintosh , William Eddolls, Gareth Stratton , Melitta McNarry , Gwyneth Davies
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DOI (Published version): 10.1016/j.jshs.2019.05.009
BackgroundHigher levels of cardiorespiratory fitness are associated with reduced asthma severity and increased quality of life in those with asthma. Therefore, the purpose of this study was to evaluate the effectiveness of a 6-month high-intensity interval training (HIIT) intervention in adolescents...
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BackgroundHigher levels of cardiorespiratory fitness are associated with reduced asthma severity and increased quality of life in those with asthma. Therefore, the purpose of this study was to evaluate the effectiveness of a 6-month high-intensity interval training (HIIT) intervention in adolescents with and without asthma.MethodsA total of 616 adolescents (334 boys; 13.0 ± 1.1 years; 1.57 ± 0.10m; 52.6 ± 12.9kg, mean ± SD), including 155 with asthma (78 boys), were recruited as part of a randomized control trial from 5 schools (4 control, 1 intervention). The 221 intervention participants (116 boys; 47 asthma) completed 6 months of school-based HIIT (30mins, 3 times per week, 10–30s bouts at >90% age-predicted maximum heart rate with equal rest). At baseline, mid-intervention, post-intervention and 3-month follow-up, measurements for 20-metre shuttle run, body mass index (BMI), lung function, Pediatric Quality of Life Inventory, Paediatric Asthma Quality of Life Questionnaire and Asthma Control Questionnaire were collected. Additionally, 69 adolescents (21 boys; 36 asthma) also completed an incremental ramp test. For analysis, each group's data (intervention and control) was divided into those with and without asthma.ResultsParticipants with asthma did not differ from their peers in any parameter of aerobic fitness, at any time-point, but were characterised by a greater BMI. The intervention elicited a significant improvement in maximal aerobic fitness but no change in sub-maximal parameters of aerobic fitness, lung function or quality of life, irrespective of asthma status. Those in the intervention group maintained their BMI, whereas BMI significantly increased in the control group throughout the 6-month period.ConclusionsHIIT represents an effective tool for improving aerobic fitness and maintaining BMI in adolescents, irrespective of asthma status. HIIT was well tolerated by those with asthma, who evidenced a similar aerobic fitness to their healthy peers and responded equally well to a HIIT programme.
Body mass index, Cardiorespiratory fitness, Intermittent exercise, Intervention, Quality of life
Faculty of Medicine, Health and Life Sciences
This work was funded by the Asthma UK Centre for Applied Research (AUK-AC-2012-01) and Swansea University Medical School.