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Coefficient of variation (CV), distance to target (DT), surface electromyogram root mean square (sEMG RMS), and mean frequency (sEMG MF) at 20% of maximum voluntary contraction (MVC) force maintained for 20 s at the beginning (pre, solid circle) and at the end (post, blank circle) of the shift cycle for the three groups. NS5, 5-day night shift; NS10, 10-day night shift; DS, day/swing shift. *p < 0.05 post vs. pre; #p < 0.05 NS5 or NS10 vs. DS.
