Abstract
Background: Barth syndrome (BTHS) is a rare X-linked disorder that is characterized by mitochondrial abnormalities, cardio-skeletal myopathy, exercise intolerance, and premature mortality. The effect on endurance exercise training on exercise tolerance, cardio-skeletal function, and quality of life in BTHS is unknown.
Methods: Four young adults (23 ± 5 years, n = 4) with BTHS participated in a 12-week, supervised, individualized endurance exercise training program. Exercise training was performed on a cycle ergometer for 30–45′ three times per week at a moderate intensity level. Exercise tolerance was measured by graded exercise testing and peak oxygen consumption, heart function via two-dimensional and M-mode echocardiography, skeletal muscle function by near-infrared spectroscopy, and quality of life through the Minnesota Living with Heart Failure questionnaire.
Results: There were no adverse events during exercise testing or training for any participant. Peak oxygen consumption modestly (~5%) improved in three or four participants. Mean quality of life questions regarding dyspnea and side effects from medications significantly improved following exercise training. Mean resting heart function or skeletal muscle oxygen extraction during exercise did not improve after exercise training.
Conclusion: Endurance exercise training is safe and appears to modestly improve peak exercise tolerance and certain measures of quality of life in young adults with BTHS. However, compared to improvements resulting from endurance exercise training seen in other non-BTHS mitochondrial myopathies and heart failure, these improvements appear blunted. Further research into the most beneficial mode, intensity and frequency of exercise training in BTHS is warranted.
Competing interests: None declared
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Communicated by: Michael J Bennett, PhD
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Endurance exercise training is safe and appears to modestly improve exercise tolerance and certain measures of quality of life in young adults with BTHS.
W. Todd Cade, Dominic Reeds, Linda Peterson, Kathryn Bohnert, Rachel Tinius, Paul Benni, Barry Byrne, and Carolyn Taylor declare that they have no conflict of interest.
Author Contributions
WTC planned the study, performed the study, analyzed the data, wrote the manuscript.
DNR performed the studies, wrote the manuscript.
LRP performed the studies, wrote the manuscript.
KLB performed the studies, wrote the manuscript.
RAT performed the studies, wrote the manuscript.
PBB analyzed the data, wrote the manuscript.
BJB planned the study, wrote the manuscript.
CLT planned the study, analyzed the data, wrote the manuscript.
Funding
This project was supported by the Barth Syndrome Foundation and by the National Institutes of Health grants: Institute of Clinical and Translational Sciences (UL1 RR024992), Diabetes Research and Training Center (DK-020579), and Nutrition-Obesity Research Center (DK-056341) from the National Center for Research Resources (NCRR) and NIH Roadmap for Medical Research. Its contents are solely the responsibility of the authors and do not necessarily represent the official view of NIH or its Institutes.
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Cade, W.T. et al. (2016). Endurance Exercise Training in Young Adults with Barth Syndrome: A Pilot Study. In: Morava, E., Baumgartner, M., Patterson, M., Rahman, S., Zschocke, J., Peters, V. (eds) JIMD Reports, Volume 32. JIMD Reports, vol 32. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2016_553
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DOI: https://doi.org/10.1007/8904_2016_553
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