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Figure 3 Arrhythmia trends during 24-h Holter electrocardiogram (ECG) recordings showing marked reversibility of premature ventricular depolarizations (PVDs) after three months of deconditioning in a 32-year-old elite bobsledder. (Top panel) The 24-h ECG performed during peak training shows 3,288 PVDs, distributed relatively homogeneously, with a slight reduction evident during the evening hours. (Bottom panel) Marked reduction in ventricular arrhythmias (to 73 PVDs) is evident after three months of physical deconditioning. The reduction of ventricular arrhythmia after detraining has occurred throughout the 24-h recording period.