Karen A Thomas1, Robert L Burr2, Susan Spieker3, Jungeun Lee4, Jessica Chen5. 1. Department of Family and Child Nursing, University of Washington, Seattle, WA 98195-7262, United States. Electronic address: kthomas@uw.edu. 2. Department of Biobehavioral Nursing and Health Systems, University of Washington, Seattle, WA 98195-7266, United States. 3. Barnard Center for Infant Mental Health & Development, Department of Family and Child Nursing, University of Washington, Seattle, WA 98195-7262, United States. 4. Department of Family and Child Nursing, University of Washington, Seattle, WA 98195-7262, United States. 5. Department of Psychology, University of Washington, Seattle, WA 98195-1525, United States.
Abstract
BACKGROUND: Mutual circadian rhythm is an early and essential component in the development of maternal-infant physiological synchrony. AIMS: The aim of this to examine the longitudinal pattern of maternal-infant circadian rhythm and rhythm synchrony as measured by rhythm parameters. STUDY DESIGN: In-home dyadic actigraphy monitoring at infant age 4, 8, and 12 weeks. SUBJECTS: Forty-three healthy mother-infant pairs. OUTCOME MEASURES: Circadian parameters derived from cosinor and non-parametric analysis including mesor, magnitude, acrophase, L5 and M10 midpoints (midpoint of lowest 5 and highest 10h of activity), amplitude, interdaily stability (IS), and intradaily variability (IV). RESULTS: Mothers experienced early disruption of circadian rhythm, with re-establishment of rhythm over time. Significant time effects were noted in increasing maternal magnitude, amplitude, and IS and decreasing IV (p<.001). Infants demonstrated a developmental trajectory of circadian pattern with significant time effects for increasing mesor, magnitude, amplitude, L5, IS, and IV (p<.001). By 12 weeks, infant phase advancement was evidenced by mean acrophase and M10 midpoint occurring 60 and 43 min (respectively) earlier than at 4 weeks. While maternal acrophase remained consistent over time, infants became increasingly phase advanced relative to mother and mean infant acrophase at 12 weeks occurred 60 min before mother. Mother-infant synchrony was evidenced in increasing correspondence of acrophase at 12 weeks (r=0.704), L5 (r=0.453) and M10 (r=0.479) midpoints. CONCLUSIONS: Development of mother-infant synchrony reflects shared elements of circadian rhythm.
BACKGROUND: Mutual circadian rhythm is an early and essential component in the development of maternal-infant physiological synchrony. AIMS: The aim of this to examine the longitudinal pattern of maternal-infant circadian rhythm and rhythm synchrony as measured by rhythm parameters. STUDY DESIGN: In-home dyadic actigraphy monitoring at infant age 4, 8, and 12 weeks. SUBJECTS: Forty-three healthy mother-infant pairs. OUTCOME MEASURES: Circadian parameters derived from cosinor and non-parametric analysis including mesor, magnitude, acrophase, L5 and M10 midpoints (midpoint of lowest 5 and highest 10h of activity), amplitude, interdaily stability (IS), and intradaily variability (IV). RESULTS: Mothers experienced early disruption of circadian rhythm, with re-establishment of rhythm over time. Significant time effects were noted in increasing maternal magnitude, amplitude, and IS and decreasing IV (p<.001). Infants demonstrated a developmental trajectory of circadian pattern with significant time effects for increasing mesor, magnitude, amplitude, L5, IS, and IV (p<.001). By 12 weeks, infant phase advancement was evidenced by mean acrophase and M10 midpoint occurring 60 and 43 min (respectively) earlier than at 4 weeks. While maternal acrophase remained consistent over time, infants became increasingly phase advanced relative to mother and mean infant acrophase at 12 weeks occurred 60 min before mother. Mother-infant synchrony was evidenced in increasing correspondence of acrophase at 12 weeks (r=0.704), L5 (r=0.453) and M10 (r=0.479) midpoints. CONCLUSIONS: Development of mother-infant synchrony reflects shared elements of circadian rhythm.
Authors: Beatrice Beebe; Joseph Jaffe; Sara Markese; Karen Buck; Henian Chen; Patricia Cohen; Lorraine Bahrick; Howard Andrews; Stanley Feldstein Journal: Attach Hum Dev Date: 2010-01
Authors: Elizabeth M Cespedes Feliciano; Mirja Quante; Jia Weng; Jonathan A Mitchell; Peter James; Catherine R Marinac; Sara Mariani; Susan Redline; Jacqueline Kerr; Suneeta Godbole; Alicia Manteiga; Daniel Wang; J Aaron Hipp Journal: Sleep Date: 2017-12-01 Impact factor: 5.849