Shawn D Youngstedt

Summary

Affiliation: University of South Carolina
Country: USA

Publications

  1. ncbi request reprint Long sleep and mortality: rationale for sleep restriction
    Shawn D Youngstedt
    Department of Psychiatry and Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, Mail Code 0667, 9500 Gilman Dr, La Jolla, CA 92093, USA
    Sleep Med Rev 8:159-74. 2004
  2. ncbi request reprint Age-related changes of circadian rhythms and sleep-wake cycles
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein Institute for Research on Aging, University of California at San Diego, La Jolla 92093, USA
    J Am Geriatr Soc 51:1085-91. 2003
  3. ncbi request reprint Actigraphy suggests age-related differences in napping and nocturnal sleep
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein, Institute for Research on Aging, University of California, San Diego, CA 92093 0667, USA
    J Sleep Res 12:87-93. 2003
  4. ncbi request reprint No association of 6-sulfatoxymelatonin with in-bed 60-Hz magnetic field exposure or illumination level among older adults
    Shawn D Youngstedt
    Department of Psychiatry, University of California at San Diego, La Jolla, California, 92093, USA
    Environ Res 89:201-9. 2002
  5. ncbi request reprint Illumination of upper and middle visual fields produces equivalent suppression of melatonin in older volunteers
    Julian S Smith
    The Sam and Rose Stein Institute for Research on Aging, Department of Psychiatry, University of California, San Diego, La Jolla 92093 0667, USA
    Chronobiol Int 19:883-91. 2002
  6. ncbi request reprint Luteinizing hormone following light exposure in healthy young men
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein, Institute for Research on Aging, 0667, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA 92093 0667, USA
    Neurosci Lett 341:25-8. 2003
  7. ncbi request reprint PRC bisection tests
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, California 92093 0667, USA
    Chronobiol Int 20:1117-23. 2003
  8. ncbi request reprint Ceiling and floor effects in sleep research
    Shawn D Youngstedt
    Department of Psychiatry and Sam and Rose, Stein Institute for Research on Aging, University of California, San Diego, California 92093 0667, USA
    Sleep Med Rev 7:351-65. 2003
  9. ncbi request reprint Melatonin excretion with affect disorders over age 60
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, La Jolla, CA 92093 0667, USA
    Psychiatry Res 118:47-54. 2003
  10. pmc Weak evidence of bright light effects on human LH and FSH
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, La Jolla, California 92093, USA
    J Circadian Rhythms 8:5. 2010

Collaborators

Detail Information

Publications18

  1. ncbi request reprint Long sleep and mortality: rationale for sleep restriction
    Shawn D Youngstedt
    Department of Psychiatry and Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, Mail Code 0667, 9500 Gilman Dr, La Jolla, CA 92093, USA
    Sleep Med Rev 8:159-74. 2004
    ..Sleep restriction may be most beneficial for older adults, who tend to spend excessive time in bed and have more sleep fragmentation compared with young adults...
  2. ncbi request reprint Age-related changes of circadian rhythms and sleep-wake cycles
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein Institute for Research on Aging, University of California at San Diego, La Jolla 92093, USA
    J Am Geriatr Soc 51:1085-91. 2003
    ..To compare relationships between the sleep-wake cycle and endogenous circadian rhythms in young and older adults and to examine correlates between evening naps and circadian rhythms in older adults...
  3. ncbi request reprint Actigraphy suggests age-related differences in napping and nocturnal sleep
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein, Institute for Research on Aging, University of California, San Diego, CA 92093 0667, USA
    J Sleep Res 12:87-93. 2003
    ..Maintaining alertness during the evening (e.g. by bright light exposure or moderate exercise) would be a possible approach to delay wake-up times in older adults...
  4. ncbi request reprint No association of 6-sulfatoxymelatonin with in-bed 60-Hz magnetic field exposure or illumination level among older adults
    Shawn D Youngstedt
    Department of Psychiatry, University of California at San Diego, La Jolla, California, 92093, USA
    Environ Res 89:201-9. 2002
    ..Illumination acrophase and amplitude were significantly associated with aMT6s acrophase. These data suggest no influence of nocturnal environmental MF exposure on aMT6s excretion in older adults...
  5. ncbi request reprint Illumination of upper and middle visual fields produces equivalent suppression of melatonin in older volunteers
    Julian S Smith
    The Sam and Rose Stein Institute for Research on Aging, Department of Psychiatry, University of California, San Diego, La Jolla 92093 0667, USA
    Chronobiol Int 19:883-91. 2002
    ..Clinical comparative testing would be valuable. In addition, this study demonstrates that significant suppression of melatonin may be achieved through the use of bright light in healthy older volunteers...
  6. ncbi request reprint Luteinizing hormone following light exposure in healthy young men
    In Young Yoon
    Department of Psychiatry and Sam and Rose Stein, Institute for Research on Aging, 0667, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA 92093 0667, USA
    Neurosci Lett 341:25-8. 2003
    ..The acrophases and offsets of aMT6s were advanced, but the duration of aMT6s excretion was not changed after BL. Light stimulation of LH could have interesting applications in psychiatry and reproductive endocrinology...
  7. ncbi request reprint PRC bisection tests
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, California 92093 0667, USA
    Chronobiol Int 20:1117-23. 2003
    ..Also, the bisection procedure yields an estimate of the inflection point of the phase response curve. A method is given to estimate the power of the PRC bisection test...
  8. ncbi request reprint Ceiling and floor effects in sleep research
    Shawn D Youngstedt
    Department of Psychiatry and Sam and Rose, Stein Institute for Research on Aging, University of California, San Diego, California 92093 0667, USA
    Sleep Med Rev 7:351-65. 2003
    ..The results show powerful CF influences on sleep responses to hypnotics and exercise and suggest a need for comparing these treatments in poor sleepers...
  9. ncbi request reprint Melatonin excretion with affect disorders over age 60
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, La Jolla, CA 92093 0667, USA
    Psychiatry Res 118:47-54. 2003
    ..These results are only weakly consistent with a photoperiodic hypothesis of depression...
  10. pmc Weak evidence of bright light effects on human LH and FSH
    Daniel F Kripke
    Department of Psychiatry, University of California, San Diego, La Jolla, California 92093, USA
    J Circadian Rhythms 8:5. 2010
    ..There is some evidence that seasonal breeding in humans is regulated by similar mechanisms, and that light stimulates LH secretion, but primate responses seem complex...
  11. pmc Tolerance of chronic 90-minute time-in-bed restriction in older long sleepers
    Shawn D Youngstedt
    Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA
    Sleep 32:1467-79. 2009
    ..To examine the influence of chronic time-in-bed (TIB) restriction on selected health-related outcome variables in older long sleepers...
  12. pmc Does bright light have an anxiolytic effect? - an open trial
    Shawn D Youngstedt
    Department of Exercise Science, Norman J, Arnold School of Public Health University of South Carolina, Columbia, SC 29208 USA
    BMC Psychiatry 7:62. 2007
    ..The aim of this open trial was to examine the influence of acute bright light exposure on anxiety in older and young adults...
  13. ncbi request reprint Effects of exercise on sleep
    Shawn D Youngstedt
    Department of Exercise Science, Norman J Arnold School of Public Health, University of South Carolina, 1300 Wheat Street, Columbia, SC 29208, USA
    Clin Sports Med 24:355-65, xi. 2005
    ..Other behavioral/cognitive treatments are more effective for chronic insomnia treatment, but difficult and costly to deliver. By contrast, exercise could be a healthy, safe, inexpensive, and simple means of improving sleep...
  14. doi request reprint Bright light treatment for high-anxious young adults: a randomized controlled pilot study
    Shawn D Youngstedt
    Department of Exercise Science, Arnold School of Public Health, University of South Carolina, 921 Assembly Street, Columbia, SC 29208, USA
    Depress Anxiety 28:324-32. 2011
    ..Available treatments for anxiety have limitations and/or side effects. The aim of this study was to examine the influence of bright light exposure as a treatment in high-anxious young adults...
  15. pmc Circadian phase response curves to light in older and young women and men
    Daniel F Kripke
    Department of Psychiatry and Sam and Rose Stein Institute on Aging, University of California, San Diego 0667, La Jolla, California 92093 0667, USA
    J Circadian Rhythms 5:4. 2007
    ..This study tested the hypotheses that older adults have absent or weaker phase-shift responses to light (3000 lux), and that women's responses might differ from those of men...
  16. ncbi request reprint No association of sleep with total daily physical activity in normal sleepers
    Shawn D Youngstedt
    Department of Psychiatry, Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 0667, USA
    Physiol Behav 78:395-401. 2003
    ..These results fail to support epidemiologic data on the value of exercise for sleep, but are consistent with experimental evidence showing only modest effects of exercise on sleep...
  17. ncbi request reprint Circadian phase-delaying effects of bright light alone and combined with exercise in humans
    Shawn D Youngstedt
    Department of Psychiatry, University of California, San Diego, La Jolla, California 92093 0667, USA
    Am J Physiol Regul Integr Comp Physiol 282:R259-66. 2002
    ..Within the limited exercise and light parameters of this study, the results suggest that exercise does not reliably modulate phase-shifting effects of late night bright light in humans...
  18. ncbi request reprint Circadian variation in swim performance
    Christopher E Kline
    Dept of Exercise Science, Arnold School of Public Health, Univ of South Carolina, 1300 Wheat St, Columbia, SC 29208, USA
    J Appl Physiol 102:641-9. 2007
    ..Mean swim performance was 169.5 s; circadian variation from peak to worst performance was 5.8 s. These data suggest a circadian rhythm in athletic performance independent of environmental and behavioral masking effects...