Background
Individuals with hypertrophic cardiomyopathy (HCM) may be asymptomatic or display
activity-limiting symptoms. A common cause of symptoms is left ventricular outflow
tract obstruction (LVOTO), which may impact the individuals’ ability to undertake
physical activity. This study sought to examine daily step count as a potential marker
of exercise capacity, which may represent a proxy marker of disease severity in HCM.
Methods
A cross-sectional study of 63 HCM patients was conducted from March to November 2015.
Participants wore an ActiGraph GT3X+ (Pensacola, Florida, USA) accelerometer for 7
days. Minutes per day of light, moderate and vigorous physical activity and step count
were calculated, and those with LVOTO were compared to those without. Similarly, those
with good functional capacity (New York Heart Association; NYHA class I) were compared
to those with NYHA class II–IV.
Results
The majority of HCM patients were male (n = 45, 71%) with mean age of 48.8 ± 14.9 years. Hypertrophic cardiomyopathy patients with history of LVOTO and those NYHA class
II–IV took significantly fewer steps per day (LV obstruction: 5527 ± 2370 versus 7027 ± 2095, p = 0.01 and NYHA: 5346 ± 1898 versus 6801 ± 2339, p = 0.03). No differences were observed across the different intensities of physical activity.
Conclusions
Measurement of daily step count may be a useful and simple tool to determine exercise
capacity and provide an indicator of disease severity in individuals with HCM.
Keywords
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Article info
Publication history
Published online: January 27, 2018
Accepted:
December 28,
2017
Received in revised form:
December 9,
2017
Received:
August 30,
2017
Identification
Copyright
© 2018 Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS) and the Cardiac Society of Australia and New Zealand (CSANZ). Published by Elsevier B.V. All rights reserved.
