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WZSC Glossary

Circadian Rhythms

Physical, mental, and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness.

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This material is based upon work supported by the Federal Highway Administration under Grant Agreements No. DTFH61-ll-H-00029 and DtFH61-13-H-00025-B. Any opinions, findings, and conclusions or recommendations expressed in this publication does not constitute a national standard, specification, or regulation. No statement made in this LMS should be construed to convey an impression that FHWA or FOF, its affiliates, or employees have assumed any part of the employer's exclusive legal responsibility for providing a "safe and healthful workplace" as mandated by the Occupational Safety and Health Act. Nor does mention of trade names, commercial products, or organizations imply endorsement.

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