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This study examined biorhythm-based metrics (circadian and ultradian rhythms, derived from the daily activity and heart rate patterns recorded by a consumer wearable) and their relationship to postoperative recovery in children with and without complications. Wearables were given to 103 children for 21 days immediately after appendectomy, and biorhythm metrics were extracted from per-minute data. A machine-learned model using these metrics retrospectively predicted postoperative complications up to 3 days before formal diagnosis with 91% sensitivity and 74% specificity. Our findings suggest that wearable-derived biorhythms offer a promising, unobtrusive method for evaluating postoperative recovery. 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