Differences in QT interval determined from multi-lead ambulatory ECG during rest and physical exercise. - M. J. Lewis; A. L. Short (Biomed. Signal Process. Control., 2006)

Influence of high-frequency bandwidth on heart rate variability analysis during physical exercise. - M. J. Lewis; Michael Kingsley; A. L. Short; Kathy J. Simpson (Biomed. Signal Process. Control., 2007)

Multifractal characterisation of electrocardiographic RR and QT time-series before and after progressive exercise. - M. J. Lewis; A. L. Short; John Suckling (Comput. Methods Programs Biomed., 2012)