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Herzig, David; Testorelli, Moreno; Schäfer, Daniela; Erlacher, Daniel; Achermann, Peter; Eser, Prisca; Wilhelm, Matthias (2016). Heart Rate Variability During Deep Sleep Offers a Time-Efficient Alternative to Morning Supine Measurements – A Study in World Class Alpine Skiers. International journal of sports physiology and performance, 12(5), pp. 648-654. Human Kinetics 10.1123/ijspp.2016-0257
