Human sleep-wake cycles in the high arctic: Effects of unusual photoperiodicity in a natural setting Export

@article{citeulike:4939965, abstract = {Studies of human circadian rhythms are typically conducted in artificial environments that are low in ecological validity. In the current study, six subjects and the field director lived in temporal isolation in a completely natural environment with constant daylight (a high Arctic research camp) for six weeks. Detailed daily sleep logs were kept. In keeping with past findings, five of the six subjects developed a free-running sleep-wake cycle longer than 24 hours. Unlike past results, the isolated subjects did not exhibit any synchronicity in their rhythms. There was a high degree of intersubject variability in circadian patterns. The findings have important implications for the comparison of the results of laboratory and field investigations of sleep-wake cycles.}, author = {Steel, Daniel G. and Callaway, Michelle and Suedfeld, Peter and Palinkas, Lawrence}, citeulike-article-id = {4939965}, citeulike-linkout-0 = {http://dx.doi.org/10.1080/09291019509360360}, doi = {10.1080/09291019509360360}, journal = {Biological Rhythm Research}, keywords = {circadian}, number = {5}, pages = {582--592}, posted-at = {2009-06-24 00:43:09}, priority = {2}, publisher = {Taylor \& Francis}, title = {Human sleep-wake cycles in the high arctic: Effects of unusual photoperiodicity in a natural setting}, url = {http://dx.doi.org/10.1080/09291019509360360}, volume = {26}, year = {1995} }

TY - JOUR ID - citeulike:4939965 L3 - citeulike-article-id:4939965 N2 - Studies of human circadian rhythms are typically conducted in artificial environments that are low in ecological validity. In the current study, six subjects and the field director lived in temporal isolation in a completely natural environment with constant daylight (a high Arctic research camp) for six weeks. Detailed daily sleep logs were kept. In keeping with past findings, five of the six subjects developed a free-running sleep-wake cycle longer than 24 hours. Unlike past results, the isolated subjects did not exhibit any synchronicity in their rhythms. There was a high degree of intersubject variability in circadian patterns. The findings have important implications for the comparison of the results of laboratory and field investigations of sleep-wake cycles. IS - 5 JF - Biological Rhythm Research EP - 592 TI - Human sleep-wake cycles in the high arctic: Effects of unusual photoperiodicity in a natural setting PB - Taylor & Francis VL - 26 SP - 582 KW - circadian AU - Steel, Daniel AU - Callaway, Michelle AU - Suedfeld, Peter AU - Palinkas, Lawrence PY - 1995/// UR - http://dx.doi.org/10.1080/09291019509360360 ER -