Heart rate variability during sleep after two, four and seven consecutive night shifts and recovery days: a cross-over intervention study

ConclusionOverall sleep-related autonomic recovery had higher parasympathetic modulation of cardiac rhythm on the 2  + 2 shift system compared to the 4 + 4 and 7 + 7 shift system.
Source: International Archives of Occupational and Environmental Health - Category: Occupational Health Source Type: research