Blacks (African Americans) Have Shorter Free-Running Circadian Periods Than Whites (Caucasian Americans)

REFERENCES

• Aschoff J. (1979). Circadian rhythms: influences of internal and external factors on the period measured in constant conditions. Z. Tierpsychol. 49:225–249.
   PubMedGoogle Scholar
• Aschoff J, Hoffmann K, Pohl H, Wever R. (1975). Re-entrainment of circadian rhythms after phase shifts of the zeitgeber. Chronobiologia 2:23–78.
   PubMedGoogle Scholar
• Burgess HJ, Eastman CI. (2008). Human tau in an ultradian light-dark cycle. J. Biol. Rhythms 23:374–376.
   PubMed Web of Science ®Google Scholar
• Burgess HJ, Revell VL, Eastman CI. (2008). A three pulse phase response curve to three milligrams of melatonin in humans. J. Physiol. 586:639–647.
   PubMed Web of Science ®Google Scholar
• Burgess HJ, Revell VL, Molina TA, Eastman CI. (2010). Human phase response curves to three days of daily melatonin: 0.5 mg versus 3.0 mg. J. Clin. Endocr. Metab. 95:3325–3331.
   PubMed Web of Science ®Google Scholar
• Campbell SS, Dawson D, Zulley J. (1993). When the human circadian system is caught napping: evidence for endogenous rhythms close to 24 hours. Sleep 16:638–640.
   PubMed Web of Science ®Google Scholar
• Carskadon MA, Labyak SE, Acebo C, Seifer R. (1999). Intrinsic circadian period of adolescent humans measured in conditions of forced desynchrony. Neurosci. Lett. 260:129–132.
   PubMed Web of Science ®Google Scholar
• Ceide ME, Pandey A, Olafiranye O, Pandy AK, Donat M, Brown CD, Jean-Louis G. (2012). Linking sleep duration to night shift-work and hypertension. Sleep 35:A203.
   PubMedGoogle Scholar
• Czeisler CA, Duffy JF, Shanahan TL, Brown EN, Mitchell JF, Rimmer DW, Ronda JM, Silva EJ, Allan JS, Emens JS, Dijk DJ, Kronauer RE. (1999). Stability, precision, and near-24-hour period of the human circadian pacemaker. Science 284:2177–2181.
   PubMed Web of Science ®Google Scholar
• Duffy JF, Cain SW, Chang A, Phillips AJK, Munch MY, Gronfier C, Wyatt JK, Dijk D, Wright KP, Czeisler CA. (2011). Sex difference in the near-24-hour intrinsic period of the human circadian timing system. Proc. Natl. Acad. Sci. U. S. A. 108:15602–15608.
   PubMed Web of Science ®Google Scholar
• Edgar DM, Kilduff TS, Martin CE, Dement WC. (1991). Influences of running wheel activity on free-running sleep/wake and drinking circadian rhythms in mice. Physiol. Behav. 50:373–378.
   PubMed Web of Science ®Google Scholar
• Emens J, Lewy AJ, Laurie AL, Songer JB. (2010). Rest-activity cycle and melatonin rhythm in blind free-runners have similar periods. J. Biol. Rhythms 25:381–384.
   PubMed Web of Science ®Google Scholar
• Endo T, Honma S, Hashimoto S, Honma K. (1999). After-effect of entrainment on the period of human circadian system. Jpn. J. Physiol. 49:425–430.
   PubMedGoogle Scholar
• Hiddinga AE, Beersma DGM, Van Den Hoofdakker RH. (1997). Endogenous and exogenous components in the circadian variation of core body temperature in humans. J. Sleep Res. 6:156–163.
   PubMed Web of Science ®Google Scholar
• Horne JA, Östberg O. (1976). A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. Int. J. Chronobiol. 4:97–110.
   PubMedGoogle Scholar
• Kelly TL, Neri DF, Grill JT, Ryman D, Hunt PD, Dijk DJ, Shanahan TL, Czeisler CA. (1999). Nonentrained circadian rhythms of melatonin in submariners scheduled to an 18-hour day. J. Biol. Rhythms 14:190–196.
   PubMed Web of Science ®Google Scholar
• Lewy AJ, Cutler NL, Sack RL. (1999). The endogenous melatonin profile as a marker of circadian phase position. J. Biol. Rhythms 14:227–236.
   PubMed Web of Science ®Google Scholar
• Lieu SJ, Curhan GC, Schernhammer ES, Forman JP. (2012). Rotating night shift work and disparate hypertension risk in African-Americans. J. Hypertens. 30:61–66.
   PubMed Web of Science ®Google Scholar
• Lockley SW, Skene DJ, Arendt J, Tabandeh H, Bird AC, Defrance R. (1997). Relationship between melatonin rhythms and visual loss in the blind. J. Clin. Endocr. Metab. 82:3763–3770.
   PubMed Web of Science ®Google Scholar
• McMenamin TM. (2007). A time to work: recent trends in shift work and flexible schedules. Mon. Labor Rev. 130 (December):3–15.
   Google Scholar
• Middleton B, Arendt J, Stone BM. (1996). Human circadian rhythms in constant dim light (8 lux) with knowledge of clock time. J. Sleep Res. 5:69–76.
   PubMed Web of Science ®Google Scholar
• Middleton B, Arendt J, Stone BM. (1997). Complex effects of melatonin on human circadian rhythms in constant dim light. J. Biol. Rhythms 12:467–477.
   PubMed Web of Science ®Google Scholar
• Mills JN. (1964). Circadian rhythms during and after three months in solitude underground. J. Physiol. 174:217–231.
   PubMed Web of Science ®Google Scholar
• Pifferi F, Dal-Pan A, Menaker M, Aujard F. (2011). Resveratrol dietary supplementation shortens the free-running circadian period and decreases body temperature in a prosimian primate. J. Biol. Rhythms 26:271–275.
   PubMed Web of Science ®Google Scholar
• Pittendrigh CS, Daan S. (1976). A functional analysis of circadian pacemakers in nocturnal rodents. I. The stability and lability of spontaneous frequency. J. Comp. Physiol. 106:223–252.
   Web of Science ®Google Scholar
• Portaluppi F, Smolensky MH, Touitou Y. (2010). Ethics and methods for biological rhythm research on animals and human beings. Chronobiol. Int. 27:1911–1929.
   PubMed Web of Science ®Google Scholar
• Presser HB, Ward BW. (2011). Nonstandard work schedules over the life course: a first look. Mon. Labor Rev. 134 (July):3–16.
   Google Scholar
• Revell VL, Eastman CI. (2005). How to trick Mother Nature into letting you fly around or stay up all night. J. Biol. Rhythms 20:353–365.
   PubMed Web of Science ®Google Scholar
• Revell VL, Molina TA, Eastman CI. (in press). Human phase response curve to intermittent blue light using a commercially available device. J. Physiol.
   Google Scholar
• Roenneberg T, Merrow M. (2007). Entrainment of the human circadian clock. Cold Spring Harb. Symp. Quant. Biol. 72:293–299.
   PubMedGoogle Scholar
• Sack RL, Lewy AJ, Blood ML, Keith LD, Nakagawa H. (1992). Circadian rhythm abnormalities in totally blind people: incidence and clinical significance. J. Clin. Endocr. Metab. 75:127–134.
   PubMed Web of Science ®Google Scholar
• Scheer FA, Wright KP Jr, Kronauer RE, Czeisler CA. (2007). Plasticity of the intrinsic period of the human circadian timing system. PLoS ONE 2:e721.
   PubMedGoogle Scholar
• Smith MR, Burgess HJ, Fogg LF, Eastman CI. (2009a). Racial differences in the human endogenous circadian period. PLoS ONE 4:e6014.
   PubMed Web of Science ®Google Scholar
• Smith MR, Fogg LF, Eastman CI. (2009b). Practical interventions to promote circadian adaptation to permanent night shift work: study 4. J. Biol. Rhythms 24:161–172.
   PubMed Web of Science ®Google Scholar
• United States Department of Labor, Bureau of Labor Statistics. (2005). Workers on flexible and shift schedules in May 2004. (July 1):1–14.
   Google Scholar
• Wever RA. (1975). The circadian multi-oscillator system of man. Int. J. Chronobiol. 3:19–55.
   PubMedGoogle Scholar
• Wever RA. (1979). The circadian system of man: results of experiments under temporal isolation. Berlin: Springer-Verlag, 276 pp.
   Google Scholar
• Wever RA. (1984). Sex differences in human circadian rhythms: intrinsic periods and sleep fractions. Experientia 40:1226–1234.
   PubMedGoogle Scholar
• Yamada N, Shimoda K, Ohi K, Takahashi S, Takahashi K. (1988). Free-access to a running wheel shortens the period of free-running rhythm in blinded rats. Physiol. Behav. 42:87–91.
   PubMed Web of Science ®Google Scholar
• Zakharia F, Basu A, Absher D, Assimes TL, Go AS, Hlatky MA, Iribarren C, Knowles JW, Li J, Narasimhan B, Sidney S, Southwick A, Myers RM, Quertermous T, Risch N, Tang H. (2009). Characterizing the admixed African ancestry of African Americans. Genome Biol. 10:R141–R141.11.
   Google Scholar