Good Sleep Quality and Progressive Increments in Vigilance During Extended Night Shifts: A 14-Day Actigraphic Study in Underground Miners.

Publication Type:

Journal Article


J Occup Environ Med, Volume 62, Issue 12, p.e754-e759 (2020)


Actigraphy, Circadian Rhythm, Humans, Sleep, Wakefulness, Work Schedule Tolerance


<p><b>OBJECTIVE: </b>Assess the change in sleep and vigilance of underground miners during long periods of extended shifts.</p><p><b>METHODS: </b>Seventy miners worked 14 consecutive 12-hour day and/or night shifts. Also, they wore an actigraph and completed a visual analog scale for vigilance four times per shift. Linear regression models with mixed effects were used.</p><p><b>RESULTS: </b>Sleep efficiency was higher during day shifts than during night shifts (86,5 vs 85.5, P < 0.05) but sleep duration did not differ (6:34 vs 6:44, n.s.). Mean vigilance level at Time 3 (02h00) was significantly lower than that at Time 1 (19h00) during the first 10 night shifts whereas mean vigilance level at Time 4 (05h30) remained significantly lower for the 14 night shifts.</p><p><b>CONCLUSIONS: </b>Underground miners exhibit good sleep quality despite evidence of limited circadian adaptation in terms of nighttime vigilance.</p>

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