Suppression of salivary melatonin secretion under 100-Hz flickering and non-flickering blue light.

Abstract:

BACKGROUND:Bright light at night is known to suppress melatonin secretion. Novel photoreceptors named intrinsically photosensitive retinal ganglion cells (ipRGCs) are mainly responsible for projecting dark/bright information to the suprachiasmatic nucleus and thus regulating the circadian system. However, it has been shown that the amplitude of the electroretinogram of ipRGCs is considerably lower under flickering light at 100 Hz than at 1-5 Hz, suggesting that flickering light may also affect the circadian system. Therefore, in this study, we evaluated light-induced melatonin suppression under flickering and non-flickering light. METHODS:Twelve male participants between the ages of 20 and 23 years (mean ± S.D. = 21.6 ± 1.5 years) were exposed to three light conditions (dim, 100-Hz flickering, and non-flickering blue light) from 1:00 A.M. to 2:30 A.M., and saliva samples were obtained just before 1:00 A.M. and at 1:15, 1:30, 2:00, and 2:30 A.M. RESULTS:A repeated measures t test with Bonferroni correction showed that at 1:15 A.M., melatonin concentrations were significantly lower following exposure to non-flickering light compared with dim light, whereas there was no significant difference between the dim and 100-Hz flickering light conditions. By contrast, after 1:30 A.M., the mean melatonin concentrations were significantly lower under both 100-Hz flickering and non-flickering light than under dim light. CONCLUSION:Although melatonin suppression rate tended to be lower under 100-Hz flickering light than under non-flickering light at the initial 15 min of the light exposure, the present study suggests that 100-Hz flickering light may have the same impact on melatonin secretion as non-flickering light.

journal_name

J Physiol Anthropol

authors

Kozaki T,Hidaka Y,Takakura JY,Kusano Y

doi

10.1186/s40101-018-0183-9

subject

Has Abstract

pub_date

2018-10-19 00:00:00

pages

23

issue

1

eissn

1880-6791

issn

1880-6805

pii

10.1186/s40101-018-0183-9

journal_volume

37

pub_type

杂志文章
  • Survey on cellular phone usage on students in Thailand.

    abstract::The number of cellular phone subscribers is increasing every year and there have been reports of health disorders related to the high-frequency radio waves. This paper considers the dependence of Thai university and high school students on cellular phones. A survey form (cellular phone dependence questionnaire: CPDQ) ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.25.377

    authors: Kawasaki N,Tanei S,Ogata F,Burapadaja S,Loetkham C,Nakamura T,Tanada S

    更新日期:2006-11-01 00:00:00

  • Use of frequency domain analysis of skin conductance for evaluation of mental workload.

    abstract::A specially designed mental task was performed by 16 subjects for frequency domain analysis of skin conductance (SC) to evaluate mental workload. The task was to memorize target letters, detect them within a 4 x 4 alphabet arrangement, and answer whether the number of targets contained in the arrangement corresponded ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.27.173

    authors: Shimomura Y,Yoda T,Sugiura K,Horiguchi A,Iwanaga K,Katsuura T

    更新日期:2008-06-01 00:00:00

  • A pilot crossover study: effects of an intervention using an activity monitor with computerized game functions on physical activity and body composition.

    abstract:BACKGROUND:Wearing an activity monitor as a motivational tool and incorporating a behavior-based reward system or a computerized game element might have a synergistic effect on an increase in daily physical activity, thereby inducing body fat reduction. This pilot crossover study aimed to examine the effects of a short...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/1880-6805-33-35

    authors: Nishiwaki M,Kuriyama A,Ikegami Y,Nakashima N,Matsumoto N

    更新日期:2014-12-02 00:00:00

  • Comparison of stress responses between mental tasks and white noise exposure.

    abstract::The purpose of this study was to compare the cardiovascular responses to different types of mental stress. Ten healthy males performed a mental arithmetic task (MA) on one day and were exposed to white noise (WN, 80dB) on another day. Both the MA and the WN were composed of four 5-min consecutive periods with a 3-min ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.26.165

    authors: Liu X,Iwanaga K,Shimomura Y,Katsuura T

    更新日期:2007-03-01 00:00:00

  • Inaccuracy of the HR reserve vs. V˙O2 reserve relationship during prone arm-paddling exercise in surfboard riders.

    abstract::Previous studies have demonstrated that during lower-body exercise the percentage of heart rate reserve (%HRR) is equivalent to the percentage of the oxygen consumption reserve (%V˙O(2R)) but not to a percentage of the peak oxygen consumption (%V˙O(2peak)). The current study examined these relationships in trained sur...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.29.189

    authors: Mendez-Villanueva A,Landaluce JP,García BF,Terrados N,Bishop D

    更新日期:2010-01-01 00:00:00

  • Spatial navigation ability is associated with the assessment of smoothness of driving during changing lanes in older drivers.

    abstract:BACKGROUND:Age-related changes affect driving ability, including the smoothness of driving. This operation requires the use of both allocentric strategies (based on world-centered representations) and egocentric strategies (based on self-centered representations); however, with age, a greater preference for egocentric ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-020-00227-9

    authors: Kunishige M,Miyaguchi H,Fukuda H,Iida T,Nami K,Ishizuki C

    更新日期:2020-08-27 00:00:00

  • Seasonal effects of the UCP3 and the RPTOR gene polymorphisms on obesity traits in Japanese adults.

    abstract:BACKGROUND:Non-shivering thermogenesis (NST) involves a substantial amount of energy expenditure in humans and, thus, contributes to reducing the risk for obesity. Molecular evolutionary studies have reported that SNPs in/near the uncoupling protein 3 gene (UCP3) and the regulatory associated protein of mTOR complex 1 ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/1880-6805-33-38

    authors: Nakayama K,Miyashita H,Iwamoto S

    更新日期:2014-12-22 00:00:00

  • Proposal for a method of non-restrictive measurement of resting heart rate in a lying position.

    abstract::Daily monitoring of heart rates is important in health management. Many researchers have analysed heart rate variability by using the resting heart rate because such an analysis can facilitate the early discovery of a variety of illnesses and health conditions. Some problems that arise in measuring heart rate are the ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.25.299

    authors: Okada S,Fujiwara Y,Suzuki S,Yasuda M,Makikawa M,Iida T

    更新日期:2006-07-01 00:00:00

  • Effect of empathy trait on attention to faces: an event-related potential (ERP) study.

    abstract:BACKGROUND:Empathy is deeply linked with the ability to adapt to human social environments. The present study investigated the relationship between the empathy trait and attention elicited by discriminating facial expressions. METHODS:Event-related potentials were measured while 32 participants (17 men and 15 women) d...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/1880-6805-33-4

    authors: Choi D,Watanuki S

    更新日期:2014-01-24 00:00:00

  • Perception of spatial requirements for wheelchair locomotion in experienced users with tetraplegia.

    abstract::This study focused on whether wheelchair users showed enhanced ability to estimate the space required for locomotion with familiar and unfamiliar wheelchairs. Tetraplegic participants, who lacked somatosensory input from the upper limbs and were unable to obtain information about the dimensions of a wheelchair from th...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.28.15

    authors: Higuchi T,Hatano N,Soma K,Imanaka K

    更新日期:2009-01-01 00:00:00

  • Evaluation of the nutritional status of rural children living in Zambia.

    abstract:BACKGROUND:Growth references (growth charts) are used to assess the nutritional and growth status of children. In developed countries, there are growth charts based on the country's national surveys. However, many developing countries do not have their own growth references, so they usually use WHO and US CDC reference...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-020-00244-8

    authors: Mitsunaga A,Yamauchi T

    更新日期:2020-11-16 00:00:00

  • Development and validation of an ELISA for a biomarker of thyroid dysfunction, thyroid peroxidase autoantibodies (TPO-Ab), in dried blood spots.

    abstract:BACKGROUND:The prevalence of allergic and autoimmune conditions has been steadily increasing in wealthy nations over the past century. One hypothesis put forward to explain this is the Old Friends Hypothesis, which posits that increased hygiene, urbanization, and lifestyle changes have reduced our exposure to parasites...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-020-00228-8

    authors: Eick GN,Cepon-Robins TJ,Devlin MJ,Kowal P,Sugiyama LS,Snodgrass JJ

    更新日期:2020-07-16 00:00:00

  • Effect of intensity of dynamic exercise on pupil diameter in humans.

    abstract::To test the hypothesis that pupil diameter, which is innervated by the autonomic nervous system, increases with exercise intensity, we determined pupil diameter during incremental exercise in eight healthy subjects. The subjects performed an incremental ergometer exercise in a room illuminated at 90-100 lx. We continu...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.29.119

    authors: Hayashi N,Someya N,Fukuba Y

    更新日期:2010-01-01 00:00:00

  • Electromyographic data do not support a progressive recruitment of muscle fibers during exercise exhibiting a VO2 slow component.

    abstract::The origin of the slow component (SC) of oxygen uptake kinetics, presenting during exercise above the ventilatory threshold (VT), remains unclear. Possible physiologic mechanisms include a progressive recruitment of type II muscle fibers. The purpose of this study was to examine alterations in muscle activity through ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.26.541

    authors: Cannon DT,Kolkhorst FW,Cipriani DJ

    更新日期:2007-09-01 00:00:00

  • The east coast districts are the possible epicenter of severe dengue in Sabah.

    abstract:BACKGROUND:Malaysia recorded the highest number of dengue cases between 2014 and 2017. There are 13 states and three federal territories in Malaysia, and each area varies in their prevalence of dengue. Sabah is one of the states situated in Borneo, Malaysia. Although dengue has been increasing for the last several year...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-020-00230-0

    authors: Kaur N,Rahim SSSA,Jaimin JJ,Dony JJF,Khoon KT,Ahmed K

    更新日期:2020-08-14 00:00:00

  • Effects of vegetable containing gamma-aminobutyric acid on the cardiac autonomic nervous system in healthy young people.

    abstract::The aim of this study was to investigate the effects of vegetable tablets containing Gamma-Aminobutyric Acid (GABA) intake on cardiovascular response and the autonomic nervous system in young adults. In a double-blind, randomized controlled trial, 7 healthy subjects were assigned to take vegetable tablets (10 g/trial)...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章,随机对照试验

    doi:10.2114/jpa2.28.101

    authors: Okita Y,Nakamura H,Kouda K,Takahashi I,Takaoka T,Kimura M,Sugiura T

    更新日期:2009-01-01 00:00:00

  • Examination of oxygen uptake kinetics in decremental load exercise by a numerical computation model.

    abstract::The purpose of this study was to establish a numerical computation model for estimation of oxygen uptake (V(.)O2) kinetics in decremental load exercise (DLE) starting from a work rate (WR) above the ventilatory threshold (>VT). In the model, WR in DLE were separated into several steps (constant load exercise, CLE) of ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.27.247

    authors: Arimitsu T,Matsuura R,Kimura T,Yunoki T,Yano T

    更新日期:2008-09-01 00:00:00

  • On the simple calculation of walking efficiency without kinematic information for its convenient use.

    abstract:BACKGROUND:Since walking is a daily activity not to require the maximal effort in healthy populations, a very few universal bio-parameters and/or methods have been defined to evaluate individual walking characteristics in those populations. A concept of "economy" is a potential candidate; however, walking economy highl...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-019-0211-4

    authors: Abe D,Fukuoka Y,Horiuchi M

    更新日期:2019-12-30 00:00:00

  • Inter-daily variability in body composition among young men.

    abstract:BACKGROUND:The present study analyses changes in body composition over the course of a working week. The purpose of the study is to identify the size of the changes in the observed parameters by means of typical error of measurement (TE) as the initial value for the interpretation of the detected changes in the repeate...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-015-0070-6

    authors: Kutáč P

    更新日期:2015-09-22 00:00:00

  • Relationship between lateral differences in the cross-sectional area of the psoas muscle and curve running time.

    abstract:BACKGROUND:The aim of this study was to investigate whether lateral differences in the cross-sectional areas of the hip and thigh muscles were related to curve sprinting time. METHODS:Thirteen college students (10 men and 3 women; mean ± SD: age, 20.4 ± 1.7 years; height, 167.6 ± 8.9 cm; mass, 57.4 ± 5.4 kg) participa...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-016-0086-6

    authors: Tottori N,Kurihara T,Otsuka M,Isaka T

    更新日期:2016-01-26 00:00:00

  • Individual variability in the peripheral and core interthreshold zones.

    abstract::The purpose of the study was to investigate the degree of subject variability in the peripheral and core temperature thresholds of the onset of shivering and sweating. Nine healthy young male subjects participated in three trials. In the first two trials, wearing only shorts, they were exposed to air temperatures of 5...

    journal_title:Journal of physiological anthropology

    pub_type: 临床试验,杂志文章

    doi:10.2114/jpa2.26.403

    authors: Kakitsuba N,Mekjavic IB,Katsuura T

    更新日期:2007-05-01 00:00:00

  • A comparison of the point of deflection from linearity of heart rate and the ventilatory threshold in the determination of the anaerobic threshold in Indian boys.

    abstract::The purpose of the study was to assess whether the point of deflection from linearity of heart rate (HRD) could be used as an alternative method to determine the ventilatory threshold (VT) in Indian (Bengali) boys that represents the determination of the anaerobic threshold (AT), and also to standardize an exercise te...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.26.31

    authors: Debray P,Dey SK

    更新日期:2007-01-01 00:00:00

  • Effects of monochromatic light on time sense for short intervals.

    abstract::We examined the effects of monochromatic light on the time sense and the central nervous system. Nine young adult volunteers participated in this study. They were exposed to red-light and blue-light environments (illuminance was kept at 310 lx). We evaluated the time sense by time-production tests of 90 s and 180 s an...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.26.95

    authors: Katsuura T,Yasuda T,Shimomura Y,Iwanaga K

    更新日期:2007-03-01 00:00:00

  • Time under tension and blood lactate response during four different resistance training methods.

    abstract::Mechanical stimuli have often been suggested to be the major determinant of resistance training adaptations; however, some studies suggested that metabolic changes also play an important role in the gains of muscle size and strength. Several resistance training methods (RTM) have been employed with the purpose of mani...

    journal_title:Journal of physiological anthropology

    pub_type: 临床试验,杂志文章

    doi:10.2114/jpa2.25.339

    authors: Gentil P,Oliveira E,Bottaro M

    更新日期:2006-09-01 00:00:00

  • Sleep patterns among shift-working flight controllers of the International Space Station: an observational study on the JAXA Flight Control Team.

    abstract:BACKGROUND:Flight controllers of the International Space Station (ISS) are engaged in shift work to provide 24-h coverage to support ISS systems. The purpose of this study was to investigate the prevalence and associated factors of shift work sleep disorder (SWSD) among Japanese ISS flight controllers. METHODS:A quest...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/s40101-016-0108-4

    authors: Mizuno K,Matsumoto A,Aiba T,Abe T,Ohshima H,Takahashi M,Inoue Y

    更新日期:2016-09-01 00:00:00

  • Clothing insulation and temperature, layer and mass of clothing under comfortable environmental conditions.

    abstract::This study was designed to investigate the relationship between the microclimate temperature and clothing insulation (Icl) under comfortable environmental conditions. In total, 20 subjects (13 women, 7 men) took part in this study. Four environmental temperatures were chosen: 14°C (to represent March/April), 25°C (May...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/1880-6805-32-11

    authors: Kwon J,Choi J

    更新日期:2013-07-01 00:00:00

  • Methodological issues related to thickness-based muscle size evaluation.

    abstract::The purpose of this study was to highlight the issues related to thickness-based muscle size evaluation that is commonly done in field studies. The cross-sectional area, thickness (the vertical distance from the upper end of the elbow flexors to that of the humerus) and width (the horizontal distance from the left to ...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.30.169

    authors: Akagi R,Iwanuma S,Fukuoka M,Kanehisa H,Fukunaga T,Kawakami Y

    更新日期:2011-01-01 00:00:00

  • Influence of maturation on anthropometry and body composition in Japanese junior high school students.

    abstract:BACKGROUND:The purpose of this study was to examine maturity-related differences in anthropometry and body composition in Japanese youth within a single year. METHODS:Two hundred and ten Japanese youth aged from 13 to 13.99 years participated in this study. Their maturity status was assessed using a self-assessment of...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.1186/1880-6805-32-5

    authors: Fukunaga Y,Takai Y,Yoshimoto T,Fujita E,Yamamoto M,Kanehisa H

    更新日期:2013-03-12 00:00:00

  • Kinematics of the compensatory step by the trailing leg following an unexpected forward slip while walking.

    abstract::In this study, we described the joint angle changes of the trailing leg during the compensatory step used to recover balance following a forward slip while walking. Fifteen healthy young males walked on a walkway which incorporated a movable platform to simulate a forward slip while walking. In 12 out of the 15 subjec...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.27.309

    authors: Kojima S,Nakajima Y,Takada J

    更新日期:2008-11-01 00:00:00

  • Physiological significance of cyclic changes in room temperature around dusk and dawn for circadian rhythms of core and skin temperature, urinary 6-hydroxymelatonin sulfate, and waking sensation just after rising.

    abstract::The present study investigated whether room temperature (T(a)) cycles around dusk and dawn could influence the circadian rhythm of rectal temperature (T(core)), urinary 6-hydroxymelatonin sulfate during nocturnal sleep, and subjective assessments of sleep in humans. Six female and two male students served as participa...

    journal_title:Journal of physiological anthropology

    pub_type: 杂志文章

    doi:10.2114/jpa2.26.429

    authors: Kondo M,Tokura H,Wakamura T,Hyun KJ,Tamotsu S,Morita T,Oishi T

    更新日期:2007-06-01 00:00:00