Editorial Material
Endocrinology & Metabolism
Giulia Zerbini, Martha Merrow, Eva C. Winnebeck
Summary: The commentary by Skeldon and Dijk on the weekly, seasonal and chronotype-dependent variation of dim light melatonin onset raises important questions about the external factors determining human phase of entrainment. Our study adds to the limited evidence from field studies in this matter by exploring the contribution of natural versus artificial light and sun time versus social time on melatonin rise in summer.
JOURNAL OF PINEAL RESEARCH
(2022)
Article
Endocrinology & Metabolism
Taiba Zornitzki, Sagi Tshori, Galit Shefer, Shira Mingelgrin, Carmit Levy, Hilla Knobler
Summary: This study aimed to evaluate the association between the month of blood test performance and testosterone levels in a large cohort of males. The results showed that both total and bioavailable testosterone levels gradually decreased with age and BMI, and were lower in certain months. Factors such as diabetes and smoking were also found to affect testosterone levels. These findings provide strong evidence that seasonal variation needs to be considered in clinical practice.
INTERNATIONAL JOURNAL OF ENDOCRINOLOGY
(2022)
Article
Medicine, General & Internal
Minglong Xin, Shengming Zhang, Longguo Zhao, Xiongjie Jin, Weon Kim, Xian Wu Cheng
Summary: This study aimed to investigate the circadian and seasonal variation of acute myocardial infarction (AMI). The findings showed that AMI exhibits a circadian rhythm, with the highest incidence in the morning. Surprisingly, the incidence of AMI was significantly lower in the cold winter compared to the other three warm seasons, and the peak of AMI occurred during months with large day and night temperature differences, such as May in Spring and October in Fall. There was no difference in circadian rhythm between Chinese Korean and Han ethnic groups.
Article
Endocrinology & Metabolism
Giulia Zerbini, Eva C. Winnebeck, Martha Merrow
Summary: The study reveals that both season and weekly schedule impact the phase of entrainment and sleep in humans. In summer, the phase of entrainment is about 1 hour earlier compared to winter, with shorter sleep duration, particularly affecting individuals with later chronotypes. These findings suggest that the phase of entrainment is linked to midday or midnight rather than sunrise or sunset.
JOURNAL OF PINEAL RESEARCH
(2021)
Article
Public, Environmental & Occupational Health
Kai Ma, Qiang Dong
Summary: The study aimed to examine the association between sleep quality and benign prostate hyperplasia (BPH) among middle-aged and older men in India. The results showed that worse sleep quality was significantly associated with a higher incidence of BPH among middle-aged and older Indian men. Further prospective studies are needed to clarify this association and explore potential mechanisms.
Article
Endocrinology & Metabolism
Gideon P. Dunster, Isabelle Hua, Alex Grahe, Jason G. Fleischer, Satchidananda Panda, Kenneth P. P. Wright Jr, Celine Vetter, Jennifer H. Doherty, Horacio O. de la Iglesia
Summary: Despite the availability of electric light, sleep timing is delayed during the winter. However, daily exposure to daylight can prevent this delayed phase of the circadian clock.
JOURNAL OF PINEAL RESEARCH
(2023)
Review
Andrology
Alexander W. Pastuszak, Marc Gittelman, James P. Tursi, Jonathan S. Jaffe, David Schofield, Martin M. Miner
Summary: Endogenous diurnal testosterone variation decreases naturally with age. Men with testosterone deficiency lack diurnal testosterone variation and exhibit a flatter testosterone profile compared to men with normal testosterone levels. Some testosterone replacement options provide intraday testosterone level variations similar to normal circadian secretion, while others provide a flatter exposure profile reflective of depot release, and some exceed the frequency and physiological range of natural diurnal testosterone variation.
Article
Ophthalmology
Nickolai G. Nilsen, Stuart J. Gilson, Hilde R. Pedersen, Lene A. Hagen, Kenneth Knoblauch, Rigmor C. Baraas
Summary: This study investigates the diurnal rhythms in the human eye in winter and summer in southeast Norway. The results suggest that ocular biometry rhythms are synchronized with melatonin secretion and show seasonal variation in young adult eyes. The variations in axial length and choroidal thickness are associated with seasonal changes in melatonin levels, indicating individual differences in adaptation to ocular diurnal rhythms.
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Valentin Wucher, Reza Sodaei, Raziel Amador, Manuel Irimia, Roderic Guigo
Summary: Circadian and circannual cycles trigger unique transcriptomic changes across human tissues, with brain and gonadal tissues showing the highest seasonality and thoracic cavity tissues exhibiting stronger day-night regulation. Core clock genes display day-night differences conserved in baboon and mouse, but adapted to their nocturnal or diurnal habits. Seasonal variation affects immune response genes and unveils cytoarchitectural changes in brain regions. This atlas of transcriptomic adaptations to cycling environmental conditions can be applied for time-adjusted drug targeting.
Article
Ecology
Monet A. Gomes, Stephen S. Ditchkoff, Sarah Zohdy, William D. Gulsby, Chad H. Newbolt
Summary: Testosterone levels peak during the breeding season in white-tailed deer population in Alabama, with older bucks having higher testosterone levels than younger bucks during this period. Individual testosterone levels as a yearling are not directly correlated with lifetime maximum testosterone levels, but mean testosterone levels are positively associated with lifetime testosterone variation. This study contributes to understanding hormonal patterns in cervids and potential intraspecific variation in lifetime reproductive strategies.
ECOLOGY AND EVOLUTION
(2021)
Article
Multidisciplinary Sciences
Amy R. M. Holtby, Beatrice A. J. McGivney, John A. W. Browne, Lisa M. Katz, Keith J. Murphy, Emmeline W. Hill
Summary: Thoroughbred racehorses undergo intense training to ensure competitiveness. Maintaining physical soundness and desirable behavior is crucial for a successful racing career. Salivary cortisol concentration can be used to objectively measure individual variation in the stress response during training milestones.
Editorial Material
Endocrinology & Metabolism
Anne C. Skeldon, Derk-Jan Dijk
Summary: The study reported seasonal and weekly changes in circadian timing of melatonin in a population exposed to daylight saving time, suggesting that these changes are more likely due to local clock time and light exposure rather than sun time.
JOURNAL OF PINEAL RESEARCH
(2021)
Article
Medicine, Research & Experimental
Junke Chang, Yongming Wu, Sicheng Zhou, Ye Tian, Yan Wang, Jie Tian, Wenpeng Song, Yinxian Dong, Jue Li, Ziyi Zhao, Guowei Che
Summary: Genetically predicted BT level was significantly associated with an increased risk of prostate cancer, while TT was found to be the suggestive protective factor against stomach cancer, pancreatic cancer, and small intestine cancer in men.
JOURNAL OF TRANSLATIONAL MEDICINE
(2022)
Article
Environmental Sciences
Jian-yong Wu, Tong Zhu, Zhu-man Chen, Jin-song Guo, Xian-yu Hou, De-rui Wang, Li-xia Zhang, Jun-min Gao
Summary: This study investigated the occurrence and characteristics of OPEs in rural areas, specifically in regions with cold year-round temperatures. The results showed seasonal variations in the presence and sources of OPEs, highlighting the need for regular monitoring in similar areas.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Sean Harrison, Neil M. Davies, Laura D. Howe, Amanda Hughes
Summary: Using genetic variants associated with testosterone, Mendelian randomization analysis found little evidence that testosterone significantly affects socioeconomic position, health, or risk-taking behavior in men or women. This suggests that previously reported associations with socioeconomic position and health may be due to residual confounding or reverse causation.
Article
Health Care Sciences & Services
Dallas Swendeman, Warren Scott Comulada, Maryann Koussa, Carol M. Worthman, Deborah Estrin, Mary Jane Rotheram-Borus, Nithya Ramanathan
JMIR MHEALTH AND UHEALTH
(2018)
Article
Multidisciplinary Sciences
Carol M. Worthman, Kathy Trang
Article
Psychology, Developmental
William E. Copeland, Carol Worthman, Lilly Shanahan, E. Jane Costello, Adrian Angold
JOURNAL OF THE AMERICAN ACADEMY OF CHILD AND ADOLESCENT PSYCHIATRY
(2019)
Article
Anthropology
Peter H. Rej, Madison H. Bondy, Jue Lin, Aric A. Prather, Brandon A. Kohrt, Carol M. Worthman, Dan T. A. Eisenberg
Summary: The study validated the stability of DNA extraction from dried blood spots (DBS) and found that DNA yields were roughly twice as large as previously recorded. In a series of meta-analyses, DBS telomere length (TL) had the highest external validity, followed by saliva, and then buccal cells.
AMERICAN JOURNAL OF HUMAN BIOLOGY
(2021)
Editorial Material
Hematology
Cynthia M. Beall
Article
Anthropology
Cynthia M. Beall, Geoff Childs, Sienna R. Craig, Kingman P. Strohl, Elizabeth Quinn, Buddha Basnyat
Summary: Studying the repeatability of traits in high-altitude environments can provide valuable insights into both statistical analysis interpretation and detecting variation from measurement or biology. The results of this study show high levels of measurement repeatability and biological stability, supporting the robust use of these traits in investigating human adaptation at high altitudes.
AMERICAN JOURNAL OF HUMAN BIOLOGY
(2022)
Article
Public, Environmental & Occupational Health
Mary Jane Rotheram-Borus, Mark Tomlinson, Carol M. Worthman, Peter Norwood, Ingrid le Roux, Mary J. O'Connor
Summary: This study examines the challenges faced by South African mothers in terms of depression, alcohol use, and HIV/AIDS, and highlights the importance of interventions to improve maternal functioning and child development. The long-term outcomes of such interventions are often not monitored, and the role of social-cultural factors in maternal depression and alcohol use in low- and middle-income countries is not well understood.
SOCIAL SCIENCE & MEDICINE
(2023)
Article
Anthropology
Carol M. Worthman, Constance A. Cummings, Daniel Lende
Summary: This article explores the role of practices as bridges between high-order cultural features and everyday life, situated within a dynamic action space and socioecological framework. It highlights the importance of practices in shaping human experience and societal dynamics.
Article
Health Care Sciences & Services
Kathy Trang, Lam X. Le, Carolyn A. Brown, Margaret Q. To, Patrick S. Sullivan, Tanja Jovanovic, Carol M. Worthman, Le Minh Giang
Summary: This study aims to evaluate the feasibility and acceptability of mobile ecological momentary assessments (EMA) among high-risk men who have sex with men (MSM) in Vietnam. The results show that participants had a positive reception of the app and provided valuable information about their mental health status and daily activities. Mobile EMA has the potential to optimize prevention and treatment outcomes for HIV and mental health comorbidity among MSM.
JMIR FORMATIVE RESEARCH
(2022)
Article
Psychiatry
Emily A. Holmes, Rory C. O'Connor, V. Hugh Perry, Irene Tracey, Simon Wessely, Louise Arseneault, Clive Ballard, Helen Christensen, Roxane Cohen Silver, Ian Everall, Tamsin Ford, Ann John, Thomas Kabir, Kate King, Ira Madan, Susan Michie, Andrew K. Przybylski, Roz Shafran, Angela Sweeney, Carol M. Worthman, Lucy Yardley, Katherine Cowan, Claire Cope, Matthew Hotopf, Ed Bullmore
Article
Psychology, Developmental
Rick O. Gilmore, Pamela M. Cole, Suman Verma, Marcel A. G. Van Aken, Carol M. Worthman
CHILD DEVELOPMENT PERSPECTIVES
(2020)
Article
Communication
Kelsey M. Gray, Dadul Namgyal, Jeremy Purcell, Tsondue Samphel, Tenzin Sonam, Karma Tenzin, Dawa Tsering, Carol M. Worthman, Arri Eisen
FRONTIERS IN COMMUNICATION
(2020)
Article
Family Studies
Carol M. Worthman, Samantha Dockray, Kristine Marceau
JOURNAL OF RESEARCH ON ADOLESCENCE
(2019)
Article
Psychology, Multidisciplinary
Jennifer S. Mascaro, Sean Kelley, Alana Darcher, Lobsang Tenzin Negi, Carol Worthman, Andrew Miller, Charles Raison
JOURNAL OF POSITIVE PSYCHOLOGY
(2018)
Article
Psychiatry
Anvita Bhardwaj, Christine Bourey, Sauharda Rai, Ramesh Prasad Adhikari, Carol M. Worthman, Brandon A. Kohrt
GLOBAL MENTAL HEALTH
(2018)