Correction for SPENGLER and SHEA, Correction for SPENGLER and SHEA, © 2002 American Thoracic Society
Omission of cross-references between related articlesTo the Editor: We performed a study that was designed to test three independent hypotheses simultaneously. Therefore, this study resulted in three publications (1–3). As data for these three experiments were collected concurrently in the same subjects, we write to correct the omission of cross-references among the published articles. The overall study involved extensive screening of each subject to ensure their healthy status, and control of their sleep/wake schedules for 2 weeks before entry into the laboratory to ensure a stable circadian pacemaker. Experiments then were performed over five consecutive days and nights in a time-isolation, environmentally controlled laboratory. The protocol included a "constant routine," comprised of 41 hours of continuous wakefulness while semi-reclined without postural changes. Given the arduous nature of the study for the subjects, and the well controlled behavioral and environmental conditions, we took the opportunity to make comprehensive measurements of both respiratory control and pulmonary function to answer separate questions. The first publication examined the effect of sleep deprivation on ventilatory control under these well controlled conditions that accounted for circadian, environmental, and behavioral influences (1). The second publication identified an endogenous circadian rhythm in pulmonary function, independent of daily changes in behavior (including sleep) and environment (2). The third publication identified an endogenous circadian rhythm in respiratory control and basal metabolism independent of daily changes in behavior (including sleep) and environment (3). We apologize for having omitted the cross-references among these related articles and for any inconvenience this may have caused the readers.
a Swiss Federal Institute of Technology Zurich, Switzerland REFERENCES
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