Journal
WORKPLACE HEALTH & SAFETY
Volume 66, Issue 4, Pages 191-200Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/2165079917734880
Keywords
nursing; intensive care unit (ICU); sleep quality; nutrition; zinc supplement; PSQI
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Funding
- Mazandaran University of Medical Sciences
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This study examined the effect of zinc supplementation on the sleep quality (SQ) of intensive care unit (ICU) nurses. In a double-blind, randomized controlled trial, 54 ICU nurses were randomly assigned to the intervention group (n = 27) that received 220 mg zinc sulfate capsules every 72 hours for 1 month and the control group (n = 26) that received placebo. Sleep quality of ICU nurses was measured by calculating the total quality sleep score using the Pittsburgh Sleep Quality Index (PSQI). The serum zinc level was a secondary outcome. All measurements were calculated at both baseline and 1 month after intervention. The total PSQI, subjective SQ, and sleep latency scores for the intervention group were significantly lower than the control group, which means that the SQ of ICU nurses in the intervention group improved from baseline. The serum zinc level of the intervention group at the end of the study was significantly higher than the control group, which means that zinc supplementation improved participants' serum zinc level. Based on these findings, the researcher suggested that zinc supplementation could be associated with better SQ, subjective SQ, and sleep latency in this group of workers.
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