Exercise Prescription in Children With Hypertrophic Cardiomyopathy

To join this study, children need to be between 10 and 18 years old and already attending the inherited heart conditions clinic at Alder Hey Children's Hospital for HCM screening, either because it runs in their family or they have a specific gene. They should have normal heart function and be able to keep a weekly exercise log, perhaps with a carer's help. Both the child and their carer should also be available for phone calls.

Children won't be able to join if they have other serious health problems like muscle or breathing conditions that affect their movement, or learning difficulties that would make exercise participation difficult. Those who already show outward signs of HCM, have had heart rhythm problems or faints related to exercise, or unexplained faints, cannot take part. If a child has an implanted heart device (ICD) or a close family member has experienced a sudden heart death, or if they can't manage the phone follow-ups, they also won't be able to participate.

If you decide to take part, you'll have some extra appointments at Alder Hey Children's Hospital. During these visits, the research team will measure your height and weight, and carry out some tests like checking your blood pressure, performing a cycle test (on a stationary bike), a sit-to-stand test, checking your hamstring flexibility, and using an ultrasound to measure your thigh muscle.

You'll also fill out a questionnaire about your quality of life. After these initial checks, you'll receive your own tailored exercise plan. In the first month, you'll have a supervised exercise session to get started and will be asked to record your activity in a logbook. For six months, the team will check in with you monthly, either by phone or in person, to see how you're getting on. After six months, all the initial tests will be repeated. Finally, there will be one more check-up six months after that to see the long-term effects.