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Hisayoshi Okamura
Cognitive and Molecular Institute of Brain Diseases, Kurume University, Fukuoka 830-0011, Japan

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Journal article
Published: 05 June 2020 in Sustainability
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The objective of this study was to explore the relationship between subjective happiness and subjective and objective sleep. The participants were 24 healthy university students (11 males, 13 females; mean age 22.4 ± 2.1). Their subjective happiness was measured by the Japanese Subjective Happiness Scale (JSHS). Furthermore, their subjective and objective sleep evaluation was measured by Ogri-Shirakawa-Azumi sleep inventory MA version (OSA-MA) and a non-contact sheet sensor (SS). The results indicated that participants with higher subjective happiness had objectively shorter sleep onset latency, higher sleep efficiency, and lower heart rate during sleep. On the other hand, no such correlations were found between subjective sleep evaluation with OSA and subjective happiness. These results suggest that subjective happiness is related with the ability to more easily fall asleep and better sleep efficiency.

ACS Style

Hisayoshi Okamura; Kengo Mihara; Akira Tsuda; Toshihiro Morisaki; Yoshiyuki Tanaka; Yoshihisa Shoji. Subjective Happiness Is Associated with Objectively Evaluated Sleep Efficiency and Heart Rate during Sleep: An Exploratory Study Using Non-Contact Sheet Sensors. Sustainability 2020, 12, 1 .

AMA Style

Hisayoshi Okamura, Kengo Mihara, Akira Tsuda, Toshihiro Morisaki, Yoshiyuki Tanaka, Yoshihisa Shoji. Subjective Happiness Is Associated with Objectively Evaluated Sleep Efficiency and Heart Rate during Sleep: An Exploratory Study Using Non-Contact Sheet Sensors. Sustainability. 2020; 12 (11):1.

Chicago/Turabian Style

Hisayoshi Okamura; Kengo Mihara; Akira Tsuda; Toshihiro Morisaki; Yoshiyuki Tanaka; Yoshihisa Shoji. 2020. "Subjective Happiness Is Associated with Objectively Evaluated Sleep Efficiency and Heart Rate during Sleep: An Exploratory Study Using Non-Contact Sheet Sensors." Sustainability 12, no. 11: 1.

Journal article
Published: 02 June 2020 in Sustainability
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The current study aimed to examine the effects of personal growth (PG) on psychobiological responses at baseline and responsiveness to laboratory acute stress in students. Twenty-four healthy students were recruited as participants. Participants were screened from 203 candidates according to levels of PG using Ryff’s scale and classified into high and low PG groups. During the laboratory session, 13 high and 11 low PG participants underwent the Trier Social Stress Test. Heart rate and high-frequency (HF) heart rate variability were monitored throughout the experiment. Salivary free-3-methoxy-4-hydroxyphenylethyleneglycol (MHPG) and perceived stress were measured at baseline, immediately after tasks and after a recovery period. Baseline and recovery perceived stress (tense arousal) were significantly lower in the high PG group compared with the low PG group. Free-MHPG and HF component returned to baseline levels during recovery significantly more rapidly in the high PG group compared with the low PG group. There were no significant group differences in heart rate. The results showed that high PG students have lower noradrenaline and higher parasympathetic nervous system activity before and after acute stress. These findings suggest a protective psychobiological pathway linking PG with better psychosomatic health in students.

ACS Style

Kengo Mihara; Hisayoshi Okamura; Yoshihisa Shoji; Kyoko Tashiro; Yukie Kinoshita; Akira Tsuda. Personal Growth and Psychobiological Stress Responsiveness to the Trier Social Stress Test in Students. Sustainability 2020, 12, 4497 .

AMA Style

Kengo Mihara, Hisayoshi Okamura, Yoshihisa Shoji, Kyoko Tashiro, Yukie Kinoshita, Akira Tsuda. Personal Growth and Psychobiological Stress Responsiveness to the Trier Social Stress Test in Students. Sustainability. 2020; 12 (11):4497.

Chicago/Turabian Style

Kengo Mihara; Hisayoshi Okamura; Yoshihisa Shoji; Kyoko Tashiro; Yukie Kinoshita; Akira Tsuda. 2020. "Personal Growth and Psychobiological Stress Responsiveness to the Trier Social Stress Test in Students." Sustainability 12, no. 11: 4497.

Randomized controlled trial
Published: 20 December 2018 in Nutrients
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Hops, the immature inflorescences of the female hop plant (Humulus lupulus L.) are one of the main components of beer and provides flavor and bitterness. β-Eudesmol, an oxygenated sesquiterpene, is reported to accumulate in a particular hop cultivar. Recently, we revealed that β-Eudesmol ingestion affected autonomic nerve activity in an animal model. The effect on humans has not been elucidated, therefore, we investigated the effects of β-Eudesmol on reducing objective and subjective markers related to sympathetic nerve activity after the application of mental stress in healthy participants. Fifty participants (male and female aged 20 to 50 years) were randomly assigned to two groups. Five minutes before taking the Trier Social Stress Test (TSST) as a mental stressor, participants in each group ingested a beverage containing β-Eudesmol, the active beverage, or a placebo beverage that did not contain β-Eudesmol. Saliva 3-methoxy-4-hydroxyphenylglycol (MHPG), a major product of noradrenaline breakdown and a representative marker of sympathetic nerve activity, was significantly lower just after the TSST in the active group compared with the placebo group. Saliva cortisol, a marker of the endocrine stress response system, was not significantly different between the two groups. No adverse events related to test beverage ingestion were observed. This is the first experimental evidence of β-Eudesmol effect for mental stress in human.

ACS Style

Kazuaki Ohara; Akane Misaizu; Yuji Kaneko; Takafumi Fukuda; Mika Miyake; Yutaka Miura; Hisayoshi Okamura; Jumpei Yajima; Akira Tsuda. β-Eudesmol, an Oxygenized Sesquiterpene, Reduces the Increase in Saliva 3-Methoxy-4-Hydroxyphenylglycol After the “Trier Social Stress Test” in Healthy Humans: A Randomized, Double-Blind, Placebo-Controlled Cross-Over Study. Nutrients 2018, 11, 9 .

AMA Style

Kazuaki Ohara, Akane Misaizu, Yuji Kaneko, Takafumi Fukuda, Mika Miyake, Yutaka Miura, Hisayoshi Okamura, Jumpei Yajima, Akira Tsuda. β-Eudesmol, an Oxygenized Sesquiterpene, Reduces the Increase in Saliva 3-Methoxy-4-Hydroxyphenylglycol After the “Trier Social Stress Test” in Healthy Humans: A Randomized, Double-Blind, Placebo-Controlled Cross-Over Study. Nutrients. 2018; 11 (1):9.

Chicago/Turabian Style

Kazuaki Ohara; Akane Misaizu; Yuji Kaneko; Takafumi Fukuda; Mika Miyake; Yutaka Miura; Hisayoshi Okamura; Jumpei Yajima; Akira Tsuda. 2018. "β-Eudesmol, an Oxygenized Sesquiterpene, Reduces the Increase in Saliva 3-Methoxy-4-Hydroxyphenylglycol After the “Trier Social Stress Test” in Healthy Humans: A Randomized, Double-Blind, Placebo-Controlled Cross-Over Study." Nutrients 11, no. 1: 9.

Journal article
Published: 31 October 2018 in Anxiety Disorder Research
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Fear of Negative Evaluation Scale日本語短縮版(SFNE)はFNEを測定する1因子構造の尺度である。しかし近年の研究においてSFNEが順向項目因子と逆転項目因子の2因子から構成される尺度である可能性が報告された。本研究ではWeb調査を通して参加した一般成人500名と大学生・専門学校生82名を対象に,SFNEの因子構造,信頼性および妥当性を検討した。探索的因子分析の結果,8項目からなる順向項目因子と4項目からなる逆転項目因子の2因子が抽出された。各因子の内的整合性と再検査信頼性は十分に高かった。逆転項目因子と比較して,順向項目因子の方が高い妥当性を有していた。本結果は逆転項目因子に比べ順向項目因子の方がFNEを正確に測定していることを示しており,FNEの測定においてはSFNEの順向項目因子を使用することが推奨される。本結果の意義と本研究の課題について検討した。

ACS Style

Masato Nihei; Honami Arai; Kaori Maeda; Shuntaro Aoki; Aki Tsuchiyagaito; Suguru Iwano; Natsuyo Tomioka; Hisayoshi Okamura; Kengo Mihara; Kentaro Shirotsuki; Satoshi Horiuchi; Yuji Sakano. Reassessment of Factor Structure, Reliability, and Validity of the Short Fear of Negative Evaluation Scale for the Japanese. Anxiety Disorder Research 2018, 10, 54 -63.

AMA Style

Masato Nihei, Honami Arai, Kaori Maeda, Shuntaro Aoki, Aki Tsuchiyagaito, Suguru Iwano, Natsuyo Tomioka, Hisayoshi Okamura, Kengo Mihara, Kentaro Shirotsuki, Satoshi Horiuchi, Yuji Sakano. Reassessment of Factor Structure, Reliability, and Validity of the Short Fear of Negative Evaluation Scale for the Japanese. Anxiety Disorder Research. 2018; 10 (1):54-63.

Chicago/Turabian Style

Masato Nihei; Honami Arai; Kaori Maeda; Shuntaro Aoki; Aki Tsuchiyagaito; Suguru Iwano; Natsuyo Tomioka; Hisayoshi Okamura; Kengo Mihara; Kentaro Shirotsuki; Satoshi Horiuchi; Yuji Sakano. 2018. "Reassessment of Factor Structure, Reliability, and Validity of the Short Fear of Negative Evaluation Scale for the Japanese." Anxiety Disorder Research 10, no. 1: 54-63.

Short communication
Published: 09 May 2015 in Personalized Medicine Universe
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ACS Style

Hisayoshi Okamura; Nobuko Anno; Akira Tsuda; Takahiro Inokuchi; Naohisa Uchimura; Kazutoyo Inanaga. The effects of Hericium erinaceus (Amyloban® 3399) on sleep quality and subjective well-being among female undergraduate students: A pilot study. Personalized Medicine Universe 2015, 4, 76 -78.

AMA Style

Hisayoshi Okamura, Nobuko Anno, Akira Tsuda, Takahiro Inokuchi, Naohisa Uchimura, Kazutoyo Inanaga. The effects of Hericium erinaceus (Amyloban® 3399) on sleep quality and subjective well-being among female undergraduate students: A pilot study. Personalized Medicine Universe. 2015; 4 ():76-78.

Chicago/Turabian Style

Hisayoshi Okamura; Nobuko Anno; Akira Tsuda; Takahiro Inokuchi; Naohisa Uchimura; Kazutoyo Inanaga. 2015. "The effects of Hericium erinaceus (Amyloban® 3399) on sleep quality and subjective well-being among female undergraduate students: A pilot study." Personalized Medicine Universe 4, no. : 76-78.

Journal article
Published: 01 January 2015 in Psychology
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In this study, an investigation based on an effectiveness study trial without special limitations was carried out regarding how 14 days’ continuous soup intake would change the mood of the participants and their salivary cortisol levels between awakening and evening. The participants consisted of 16 healthy workers who agreed to participate in the experiment. The participants led their normal daily lives without consuming soup for the first 14 days (controlled condition), and then consumed their chosen soup once a day, at approximately 3 p.m., for the next 14 days (soup condition). Their salivary cortisol levels were measured when they woke up in the morning (awakening) and at 5 p.m. on the last day of each condition, while their mood was evaluated by questionnaire at 5 p.m. every day. The irritation-anger score of the soup condition was significantly lower than that of the controlled condition, and the difference in the salivary cortisol level between awakening and evening in the soup condition was significantly higher compared with the controlled condition. As a result, this study suggests that continuous soup intake under conditions of free choice in the afternoon at the workplace may be effective in relieving stress of worker’s body and mind.

ACS Style

Jumpei Yajima; Akira Tsuda; Hisayoshi Okamura; Hidenori Urata; Akira Matsubara; Kengo Mihara; Takashi Isomura; Kazuhiko Takeda; Naoki Midoh. Effects of Soup Intake for Fourteen Days on the Mood and the Difference in Cortisol of Awakening and Evening in the Clerical Employees: An Effectiveness Study Trial. Psychology 2015, 06, 1108 -1113.

AMA Style

Jumpei Yajima, Akira Tsuda, Hisayoshi Okamura, Hidenori Urata, Akira Matsubara, Kengo Mihara, Takashi Isomura, Kazuhiko Takeda, Naoki Midoh. Effects of Soup Intake for Fourteen Days on the Mood and the Difference in Cortisol of Awakening and Evening in the Clerical Employees: An Effectiveness Study Trial. Psychology. 2015; 06 (09):1108-1113.

Chicago/Turabian Style

Jumpei Yajima; Akira Tsuda; Hisayoshi Okamura; Hidenori Urata; Akira Matsubara; Kengo Mihara; Takashi Isomura; Kazuhiko Takeda; Naoki Midoh. 2015. "Effects of Soup Intake for Fourteen Days on the Mood and the Difference in Cortisol of Awakening and Evening in the Clerical Employees: An Effectiveness Study Trial." Psychology 06, no. 09: 1108-1113.

Brief report
Published: 14 September 2014 in Psychophysiology
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Levels of 3‐methoxy‐4‐hydroxyphenylglycol (MHPG) may reflect central noradrenergic activity. In this study, we investigated salivary MHPG changes after awakening, and explored their relationships with cortisol and peripheral autonomic activity. The participants were 25 college students. Saliva samples were collected on awakening and 30 min after awakening to determine MHPG and cortisol. Ambulatory electrocardiograms were obtained to assess heart rate, cardiac sympathetic index (CSI), and cardiac vagal index (CVI) before and after awakening. MHPG levels increased significantly during the first 30 min after awakening. Similarly, cortisol, heart rate, and CSI increased during the 30 min after awakening, but changes in MHPG did not correlate with changes in cortisol, heart rate, CSI, and CVI during that period. This study demonstrated that salivary MHPG levels increase after awakening, in common with cortisol, heart rate, and cardiac sympathetic activity.

ACS Style

Nagisa Sugaya; Shuhei Izawa; Ryuichiro Yamamoto; Namiko Ogawa; Jumpei Yajima; Hisayoshi Okamura; Satoshi Horiuchi; Akira Tsuda; Shinobu Nomura. Salivary 3-methoxy-4-hydroxyphenylglycol increases after awakening in healthy young adults. Psychophysiology 2014, 52, 425 -428.

AMA Style

Nagisa Sugaya, Shuhei Izawa, Ryuichiro Yamamoto, Namiko Ogawa, Jumpei Yajima, Hisayoshi Okamura, Satoshi Horiuchi, Akira Tsuda, Shinobu Nomura. Salivary 3-methoxy-4-hydroxyphenylglycol increases after awakening in healthy young adults. Psychophysiology. 2014; 52 (3):425-428.

Chicago/Turabian Style

Nagisa Sugaya; Shuhei Izawa; Ryuichiro Yamamoto; Namiko Ogawa; Jumpei Yajima; Hisayoshi Okamura; Satoshi Horiuchi; Akira Tsuda; Shinobu Nomura. 2014. "Salivary 3-methoxy-4-hydroxyphenylglycol increases after awakening in healthy young adults." Psychophysiology 52, no. 3: 425-428.

Randomized controlled trial
Published: 03 June 2014 in Nutrition Journal
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L-ornithine is a non-essential, non-protein amino acid. Although L-ornithine is contained in various foods, the amount is usually small. Recently, studies have shown that orally administered L-ornithine reduced the stress response in animals. From these findings, we speculated that L-ornithine may play a role in the relieve of stress and improve sleep and fatigue symptoms in humans. Through a randomised, double-blind, placebo-controlled clinical study, we asked if L-ornithine could be beneficial to stress and sleep in healthy workers. Fifty-two apparently healthy Japanese adults who had previously felt slight stress as well as fatigue were recruited to be study participants and were randomly divided into either the L-ornithine (400 mg/day) or placebo group. They orally consumed the respective test substance every day for 8 weeks. Serum was collected for the assessment of cortisol and dehydroepiandrosterone-sulphate (DHEA-S). Perceived mood and quality of sleep were measured by the Profile of Mood States (POMS), Athens Insomnia Scale (AIS), and Ogri-Shirakawa-Azumi sleep inventory MA version (OSA-MA). Serum cortisol levels and the cortisol/DHEA-S ratio were significantly decreased in the L-ornithine group in comparison with the placebo group. Also, anger was reduced and perceived sleep quality was improved in the L-ornithine group. L-ornithine supplementation has the potential to relieve stress and improve sleep quality related to fatigue, both objectively and subjectively.

ACS Style

Mika Miyake; Takayoshi Kirisako; Takeshi Kokubo; Yutaka Miura; Koji Morishita; Hisayoshi Okamura; Akira Tsuda. Randomised controlled trial of the effects of L-ornithine on stress markers and sleep quality in healthy workers. Nutrition Journal 2014, 13, 53 -53.

AMA Style

Mika Miyake, Takayoshi Kirisako, Takeshi Kokubo, Yutaka Miura, Koji Morishita, Hisayoshi Okamura, Akira Tsuda. Randomised controlled trial of the effects of L-ornithine on stress markers and sleep quality in healthy workers. Nutrition Journal. 2014; 13 (1):53-53.

Chicago/Turabian Style

Mika Miyake; Takayoshi Kirisako; Takeshi Kokubo; Yutaka Miura; Koji Morishita; Hisayoshi Okamura; Akira Tsuda. 2014. "Randomised controlled trial of the effects of L-ornithine on stress markers and sleep quality in healthy workers." Nutrition Journal 13, no. 1: 53-53.

Journal article
Published: 01 January 2014 in Biopsychosocial Medicine
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Cortisol awakening response (CAR) as an indicator of psychological stress and related physical and psychiatric diseases has attracted growing attention from researchers. Although CAR changes have been investigated extensively in children with behavioral and psychiatric disorders, the association between CAR and conventional psychometric scales for healthy children has not been reported. The aim of this study was to investigate the association between salivary CAR and subscales of Profiles of Mood States (POMS), a self-assessment questionnaire widely used to evaluate the temporal emotional states of healthy children. This study included 18 healthy girls aged 13–16 years. Saliva was collected immediately on awakening, 30 min and 60 min after waking, and then at 2-hour intervals from 9 am to 5 pm. The current mood state, including depression, anxiety, fatigue, and other psychometric profiles were assessed using POMS. The magnitude of salivary CAR and the area under the concentration-time curve (AUC) for diurnal salivary cortisol were compared with the profiles. There were significant positive correlations between the magnitude of CAR and the POMS subscales for "Depression-Dejection", "Tension-Anxiety", "Fatigue", and "Confusion". No correlation was found between the AUC salivary cortisol level and the psychometric profiles. Salivary CAR was associated with various mood states of healthy female children but diurnal salivary cortisol AUC was not. Salivary CAR may be a biomarker of the physical and mental condition of healthy female children.

ACS Style

Ikuhiko Shibuya; Shinichiro Nagamitsu; Hisayoshi Okamura; Shuichi Ozono; Hiromi Chiba; Takashi Ohya; Yushiro Yamashita; Toyojiro Matsuishi. High correlation between salivary cortisol awakening response and the psychometric profiles of healthy children. Biopsychosocial Medicine 2014, 8, 9 -9.

AMA Style

Ikuhiko Shibuya, Shinichiro Nagamitsu, Hisayoshi Okamura, Shuichi Ozono, Hiromi Chiba, Takashi Ohya, Yushiro Yamashita, Toyojiro Matsuishi. High correlation between salivary cortisol awakening response and the psychometric profiles of healthy children. Biopsychosocial Medicine. 2014; 8 (1):9-9.

Chicago/Turabian Style

Ikuhiko Shibuya; Shinichiro Nagamitsu; Hisayoshi Okamura; Shuichi Ozono; Hiromi Chiba; Takashi Ohya; Yushiro Yamashita; Toyojiro Matsuishi. 2014. "High correlation between salivary cortisol awakening response and the psychometric profiles of healthy children." Biopsychosocial Medicine 8, no. 1: 9-9.

Journal article
Published: 19 August 2012 in Functional Foods in Health and Disease
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Seventeen adult male and female subjects participated in a clinical trial using an open-label trial to evaluate the effectiveness of pyrroloquinoline quinone (PQQ) on stress, fatigue, quality of life and sleep. They ingested 20 mg of PQQ daily for 8 weeks. Changes in stress, fatigue, quality of life measures and sleep were evaluated using various inventories and questionnaires. For example, the results of the Profile of Mood States-Short Form revealed that all six measures of vigor, fatigue, tension-anxiety, depression, anger-hostility and confusion were significantly improved following PQQ administration compared with scores for those measures before administration of PQQ. Measures for quality of life, appetite, sleep, obsession and pain, also improved significantly. The results of the Oguri-Shirakawa-Azumi Sleep Inventory (Middle Aged and Aged version) showed significant improvement in sleepiness at awakening, sleep onset and maintenance, and sleep duration. For validation, the Pittsburgh Sleep Quality Index Japanese version also showed significant improvement in sleep-related behavior. Furthermore, the changes in these global scores were correlated with changes in the cortisol awakening response (R = -0.55), i.e. the effects of PQQ on improvement of sleep quality are supported by a biomarker.Keywords: Pyrroloquinoline quinone, stress, fatigue, quality of life, sleep

ACS Style

Masahiko Nakano; Tetsuro Yamamoto; Hisayoshi Okamura; Akira Tsuda; Yasuyuki Kowatari. Effects of Oral Supplementation with Pyrroloquinoline Quinone on Stress, Fatigue, and Sleep. Functional Foods in Health and Disease 2012, 2, 307 .

AMA Style

Masahiko Nakano, Tetsuro Yamamoto, Hisayoshi Okamura, Akira Tsuda, Yasuyuki Kowatari. Effects of Oral Supplementation with Pyrroloquinoline Quinone on Stress, Fatigue, and Sleep. Functional Foods in Health and Disease. 2012; 2 (8):307.

Chicago/Turabian Style

Masahiko Nakano; Tetsuro Yamamoto; Hisayoshi Okamura; Akira Tsuda; Yasuyuki Kowatari. 2012. "Effects of Oral Supplementation with Pyrroloquinoline Quinone on Stress, Fatigue, and Sleep." Functional Foods in Health and Disease 2, no. 8: 307.

Research article
Published: 05 January 2011 in Stress and Health
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A host of interventions are now known to be helpful to alleviate subjective distress and improve well‐being in dementia caregivers. However, few intervention studies have focused on measures of physical health, and none have examined cortisol as an outcome—despite the fact that cortisol is regarded as a crucial biological intermediary by which chronic stress leads to disease. In this study, we examined demographic and psychosocial factors as predictors of salivary cortisol at a baseline assessment, among a sample of 175 Latino/Hispanic and Caucasian women caring for a family member with dementia. We also examined the influence of a cognitive–behaviour‐based psychoeducational intervention (Coping with Caregiving) on cortisol at a post‐treatment assessment, compared with a minimal support condition. Results revealed that caregivers with high intensity caregiving situations, characterized by long hours of care and co‐residence with the care recipient, tended to have less adaptive cortisol patterns. However, these ‘at‐risk’ caregivers benefited most from the Coping with Caregiving intervention and had more normal cortisol patterns at post‐treatment, compared with caregivers in the control condition. Copyright © 2011 John Wiley & Sons, Ltd.

ACS Style

Jason M. Holland; Larry W. Thompson; Michael A. Cucciare; Akira Tsuda; Hisayoshi Okamura; David Spiegel; Natalie L. Rasgon; Dolores Gallagher-Thompson. Cortisol outcomes among caucasian and latina/hispanic women caring for a family member with dementia: a preliminary examination of psychosocial predictors and effects of a psychoeducational intervention. Stress and Health 2011, 27, 334 -346.

AMA Style

Jason M. Holland, Larry W. Thompson, Michael A. Cucciare, Akira Tsuda, Hisayoshi Okamura, David Spiegel, Natalie L. Rasgon, Dolores Gallagher-Thompson. Cortisol outcomes among caucasian and latina/hispanic women caring for a family member with dementia: a preliminary examination of psychosocial predictors and effects of a psychoeducational intervention. Stress and Health. 2011; 27 (4):334-346.

Chicago/Turabian Style

Jason M. Holland; Larry W. Thompson; Michael A. Cucciare; Akira Tsuda; Hisayoshi Okamura; David Spiegel; Natalie L. Rasgon; Dolores Gallagher-Thompson. 2011. "Cortisol outcomes among caucasian and latina/hispanic women caring for a family member with dementia: a preliminary examination of psychosocial predictors and effects of a psychoeducational intervention." Stress and Health 27, no. 4: 334-346.

Journal article
Published: 31 December 2010 in International Journal of Psychophysiology
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The aim of this study was to examine the association between self-reported sleeping time and psychobiological stress responses [3-Methoxy-4-hydroxyphenylglycol (MHPG) and Secretory immunoglobulin A (IgA), perceived stress responses]. Thirty seven healthy men and women were recruited, and participants were divided according to the habitual number of hours of sleep as follows: adequate sleepers (AS) (6–8 h sleep per night regularly) (N = 22) and short sleepers (SS) (less than 5 h sleep per night regularly) (N = 15). Salivary MHPG, s-IgA and perceived stress were measured at baseline, immediately after task and recovery period. An increase in free-MHPG during the task period was observed in AS although free-MHPG increased only after the task period in SS. The level of s-IgA in both groups significantly increased during the task period, and quickly returned to a basal level during the recovery period. The results show that less than 5 h of sleep was associated with different responsiveness to the Stroop color word conflict task compared to sufficient sleep, especially in the NA system.

ACS Style

Hisayoshi Okamura; Akira Tsuda; Jumpei Yajima; Hamer Mark; Satoshi Horiuchi; Natsuki Toyoshima; Toyojirou Matsuishi. Short sleeping time and psychobiological responses to acute stress. International Journal of Psychophysiology 2010, 78, 209 -214.

AMA Style

Hisayoshi Okamura, Akira Tsuda, Jumpei Yajima, Hamer Mark, Satoshi Horiuchi, Natsuki Toyoshima, Toyojirou Matsuishi. Short sleeping time and psychobiological responses to acute stress. International Journal of Psychophysiology. 2010; 78 (3):209-214.

Chicago/Turabian Style

Hisayoshi Okamura; Akira Tsuda; Jumpei Yajima; Hamer Mark; Satoshi Horiuchi; Natsuki Toyoshima; Toyojirou Matsuishi. 2010. "Short sleeping time and psychobiological responses to acute stress." International Journal of Psychophysiology 78, no. 3: 209-214.