Research Topics
| S D YoungstedtSummaryAffiliation: University of California Country: USA Publications
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Detail Information
Publications
No association of sleep with total daily physical activity in normal sleepersShawn 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...- Circadian phase-delaying effects of bright light alone and combined with exercise in humansShawn 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... - Circadian abnormalities in older adultsS D Youngstedt
Department of Psychiatry, Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla, CA 92093 0667, USA
J Pineal Res 31:264-72. 2001..g., sleep apnea, depression). These observations suggest that circadian malsynchronization might be a common and significant cause of disturbed sleep among adults over age 60... - The influence of acute exercise on sleep following high caffeine intakeS D Youngstedt
Department of Psychiatry, 0667, University of California, San Diego, La Jolla, CA 92093, USA
Physiol Behav 68:563-70. 2000..In general, the effects of exercise on sleep were not greater following caffeine compared to placebo. Indeed, increases in slow-wave sleep after exercise were approximately 1/3 smaller following caffeine treatment compared to placebo... - The influence of air travel on athletic performanceS D Youngstedt
Department of Psychiatry, University of California, San Diego, La Jolla 92093 0667, USA
Sports Med 28:197-207. 1999..More rigorous research is needed to establish whether athletic performance is influenced by air travel... - Is sleep disturbed by vigorous late-night exercise?S D Youngstedt
Department of Psychiatry, University of California, San Diego, La Jolla 92093 0667, USA
Med Sci Sports Exerc 31:864-9. 1999..This experiment examined the influence of prolonged, vigorous late-night exercise on sleep... - Periodic leg movements during sleep and sleep disturbances in eldersS D Youngstedt
Department of Psychiatry, University of California, San Diego, USA
J Gerontol A Biol Sci Med Sci 53:M391-4. 1998..5 SD years); and (b) to correlate MI with sleep history, depression scores, and objective and subjective indices of sleep... - Acute exercise reduces caffeine-induced anxiogenesisS D Youngstedt
Department of Psychiatry, University of California, San Diego, La Jolla 92093, USA
Med Sci Sports Exerc 30:740-5. 1998..This experiment examined the influence of acute exercise on anxiety following caffeine-induced elevations in self-rated anxiety... - Melatonin excretion is not related to sleep in the elderlyS D Youngstedt
Department of Psychiatry and Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla 92093 0667, USA
J Pineal Res 24:142-5. 1998..These data indicate that low melatonin production may not be an important factor in insomnia among the elderly... - Melatonin: marvel or marker?D F Kripke
Department of Psychiatry and the Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla 92093 0667, USA
Ann Med 30:81-7. 1998..These data suggest that melatonin is a useful marker of circadian rhythm phase disorders, but suggest a need for more caution in melatonin administration... - The effects of acute exercise on sleep: a quantitative synthesisS D Youngstedt
Department of Psychiatry, University of California, San Diego, La Jolla 92093-0667, USA
Sleep 20:203-14. 1997..Hence, the effects we report herein may be underestimates of the efficacy of exercise for enhancing sleep among people with sleep disturbances... - Circadian phase in adults of contrasting agesD F Kripke
Department of Psychiatry, University of California, San Diego, La Jolla, CA 92093 0667, USA
Chronobiol Int 22:695-709. 2005..In summary, there was no evidence for circadian desynchronization associated with aging, but there was evidence of some rearrangement of the internal phase-angles among the studied circadian rhythms... - Retinal circadian rhythms in humansA Tuunainen
Department of Psychiatry, University of California San Diego, La Jolla 92093-0667, USA
Chronobiol Int 18:957-71. 2001..As the retinal rhythms had much poorer signal-to-noise ratios than the temperature rhythm, these measures cannot be recommended as circadian markers... - Sleep estimation from wrist movement quantified by different actigraphic modalitiesG Jean-Louis
Department of Psychiatry, University of California, Sam and Rose Stein Institute for Research on Aging, San Diego, CA, USA
J Neurosci Methods 105:185-91. 2001..Wrist movement quantified by the Mini Motionlogger proportional-integrating mode yielded the best accuracy for detection of sleep--wake states... - No association of 6-sulfatoxymelatonin with in-bed 60-Hz magnetic field exposure or illumination level among older adultsShawn 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... - PRC bisection testsDaniel 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... - Age-related changes of circadian rhythms and sleep-wake cyclesIn-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..Early awakening in older adults cannot be explained simply by a relative phase advance of the circadian system. Evening naps and advanced illumination may play a role in the advance of the circadian system in aging... - Melatonin excretion with affect disorders over age 60Daniel 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... - Actigraphy suggests age-related differences in napping and nocturnal sleepIn 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... - Luteinizing hormone following light exposure in healthy young menIn-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... - Circadian variation in swim performanceChristopher 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... - Effects of exercise on sleepShawn 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... - Long sleep and mortality: rationale for sleep restrictionShawn 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... - Ceiling and floor effects in sleep researchShawn 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... - Illumination of upper and middle visual fields produces equivalent suppression of melatonin in older volunteersJulian 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... 
Does bright light have an anxiolytic effect? - an open trialShawn 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...