What counted as stable exercise during follow-up?
A report on outcomes in low-risk HCM patients who maintained stable exercise habits raises a measurement question: what counted as stable across follow-up? Repeated measures of frequency, intensity, duration, and interruptions would support a sustained-exposure interpretation, while a baseline measure alone would not show whether habits remained unchanged. The definition also matters for separating adaptation associated with continued activity from short-term responses around individual exercise sessions.
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