Pub Date : 2022-03-10DOI: 10.1080/09291016.2022.2050978
Parisa Najari-Hanjani, T. Farazmandfar, M. Golalipour
ABSTRACT The circadian clock allows the body to coordinate physiology with the light and dark cycles of the day. One of the critical components of the molecular clock machinery is the PER family of circadian clock genes, including PER1, PER2, and PER3. The PER3P1 (or PER4) is the only molecular clock-related pseudogene that has been derived from the PER3 gene. Pseudogenes have an essential role in the regulation of gene expression. In this study, we investigated the PER3P1 fluctuations and their effects on the PER3 expression level. We hypothesized that the PER3P1 pseudogene suppresses clock-related miRNAs and positively affects clock genes levels. The results showed that PER3P1 and its parent gene had a corresponding oscillatory expression pattern. The overexpression of PER3P1 increased the mRNA level of PER3. In contrast, the downregulation of PER3 decreased PER3P1 expression. Furthermore, PER3P1 modulates the expression level of other clock genes, including PER1, PER2, CRY1, and CRY2. Our results suggest that the PER3P1 pseudogene may positively affect the PER3 and other clock-related gene expressions.
{"title":"PER3P1 pseudogene modulates PER3 oscillation: a new player in the molecular clock network","authors":"Parisa Najari-Hanjani, T. Farazmandfar, M. Golalipour","doi":"10.1080/09291016.2022.2050978","DOIUrl":"https://doi.org/10.1080/09291016.2022.2050978","url":null,"abstract":"ABSTRACT The circadian clock allows the body to coordinate physiology with the light and dark cycles of the day. One of the critical components of the molecular clock machinery is the PER family of circadian clock genes, including PER1, PER2, and PER3. The PER3P1 (or PER4) is the only molecular clock-related pseudogene that has been derived from the PER3 gene. Pseudogenes have an essential role in the regulation of gene expression. In this study, we investigated the PER3P1 fluctuations and their effects on the PER3 expression level. We hypothesized that the PER3P1 pseudogene suppresses clock-related miRNAs and positively affects clock genes levels. The results showed that PER3P1 and its parent gene had a corresponding oscillatory expression pattern. The overexpression of PER3P1 increased the mRNA level of PER3. In contrast, the downregulation of PER3 decreased PER3P1 expression. Furthermore, PER3P1 modulates the expression level of other clock genes, including PER1, PER2, CRY1, and CRY2. Our results suggest that the PER3P1 pseudogene may positively affect the PER3 and other clock-related gene expressions.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42026297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-08DOI: 10.1080/09291016.2022.2050505
H. Akbari, F. Asgarian, S. Mozafari, Mohammad Hajijafari
ABSTRACT This study aimed to evaluate the validity and reliability of the Persian version of the Bergen Shift Work Sleep Questionnaire (BSWSQ) in Iranian nurses. This cross-sectional study was performed on nurses in Kashan using simple random sampling. The original text of the BSWSQ was translated into Persian using the direct-reverse method. The Persian version of the questionnaire was culturally adapted performed. After collecting and scoring the questionnaires, the construct validity was performed using exploratory and confirmatory factor analysis. Convergent and divergent validity were also performed. Spearman correlation coefficient, Cronbach’s alpha, and ICC calculation were also used to measure reliability. A total of 280 people participated in this study, of which 77.2% were female. Cronbach’s alpha of the total BSWSQ was 0.83. The intra-class correlation index (ICC) was calculated as 0.88 (0.93–0.8) using the test-retest method to estimate the reliability of the tools. Exploratory factor analysis explained 75% of the total variance. This study showed that the Persian translation of the BSWSQ has good validity and reliability for assessing nurses’ sleep in the Iranian population. This tool can be a standard tool for assessing sleep quality in employees with work shift rotations.
{"title":"Reliability and validity of Persian version of Bergen Shift Work Sleep Questionnaire in nursing","authors":"H. Akbari, F. Asgarian, S. Mozafari, Mohammad Hajijafari","doi":"10.1080/09291016.2022.2050505","DOIUrl":"https://doi.org/10.1080/09291016.2022.2050505","url":null,"abstract":"ABSTRACT This study aimed to evaluate the validity and reliability of the Persian version of the Bergen Shift Work Sleep Questionnaire (BSWSQ) in Iranian nurses. This cross-sectional study was performed on nurses in Kashan using simple random sampling. The original text of the BSWSQ was translated into Persian using the direct-reverse method. The Persian version of the questionnaire was culturally adapted performed. After collecting and scoring the questionnaires, the construct validity was performed using exploratory and confirmatory factor analysis. Convergent and divergent validity were also performed. Spearman correlation coefficient, Cronbach’s alpha, and ICC calculation were also used to measure reliability. A total of 280 people participated in this study, of which 77.2% were female. Cronbach’s alpha of the total BSWSQ was 0.83. The intra-class correlation index (ICC) was calculated as 0.88 (0.93–0.8) using the test-retest method to estimate the reliability of the tools. Exploratory factor analysis explained 75% of the total variance. This study showed that the Persian translation of the BSWSQ has good validity and reliability for assessing nurses’ sleep in the Iranian population. This tool can be a standard tool for assessing sleep quality in employees with work shift rotations.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46890221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-02DOI: 10.1080/09291016.2022.2044632
R. Sultana, A. Pati
ABSTRACT This cross-sectional study attempted to determine the 24-h blood pressure variability (BPV) and nocturnal dipping, through designated temporal windows in diabetic and hypothyroid patients. BPV profiles were examined in the cohorts of 26 diabetics and 27 hypothyroid patients on their prescribed medications. Fifty-seven (57) healthy normotensive subjects were treated as controls. We recorded blood pressure (BP)parameters in each subject over at least two to three consecutive days, using an ambulatory blood pressure monitor (ABPM). We analyzed the data employing A&D software, Cosinor rhythmometry, and SPSS software. Most of the patients displayed a statistically significant circadian rhythm with prominent periodsat 24 h and/or 12 h. The hourly-averaged data in patients exceeded the normal range of BP during the early morning and late afternoon. BP parameters in studied patients were significantly higher than in the controls. The results depicted significant and independent effects of “temporal window” and “disease” on the nocturnal BP profile. Higher BPV and bouts of nocturnal hypotension in diabetic and hypothyroid patients indicate poor BP management. The diagnosis of BP and efficacy of treatment in diabetic and hypothyroid patients could be detected proficiently by ambulatory BP monitoring. Temporal window analysis could be beneficial for tracing nocturnal dipping precisely.
{"title":"Twenty-four-hour and nocturnal ambulatory blood pressure variability patterns in diabetics and hypothyroid patients: Looking through different temporal windows","authors":"R. Sultana, A. Pati","doi":"10.1080/09291016.2022.2044632","DOIUrl":"https://doi.org/10.1080/09291016.2022.2044632","url":null,"abstract":"ABSTRACT This cross-sectional study attempted to determine the 24-h blood pressure variability (BPV) and nocturnal dipping, through designated temporal windows in diabetic and hypothyroid patients. BPV profiles were examined in the cohorts of 26 diabetics and 27 hypothyroid patients on their prescribed medications. Fifty-seven (57) healthy normotensive subjects were treated as controls. We recorded blood pressure (BP)parameters in each subject over at least two to three consecutive days, using an ambulatory blood pressure monitor (ABPM). We analyzed the data employing A&D software, Cosinor rhythmometry, and SPSS software. Most of the patients displayed a statistically significant circadian rhythm with prominent periodsat 24 h and/or 12 h. The hourly-averaged data in patients exceeded the normal range of BP during the early morning and late afternoon. BP parameters in studied patients were significantly higher than in the controls. The results depicted significant and independent effects of “temporal window” and “disease” on the nocturnal BP profile. Higher BPV and bouts of nocturnal hypotension in diabetic and hypothyroid patients indicate poor BP management. The diagnosis of BP and efficacy of treatment in diabetic and hypothyroid patients could be detected proficiently by ambulatory BP monitoring. Temporal window analysis could be beneficial for tracing nocturnal dipping precisely.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47780449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-28DOI: 10.1080/09291016.2022.2046416
Kodai Fukunaga, Y. Takeuchi, C. Yamauchi, A. Takemura
ABSTRACT In the reproductive season, lunar-synchronized fish spawn during species-specific moon phases. It remains unknown how they perceive cues from the moon for initiating gonadal development and subsequent spawning. We hypothesized that fish use moonlight to synchronize reproductive events. Using the honeycomb grouper Epinephelus merra, a tropical Serranidae, spawns around the time of the full moon, we report the successful induction of spawning in this species by controlling light condition at night. Following 3 months of acclimatization under long days (14:10) at 28 ± 1.0°C, mature fish were reared under an artificial full (experimental group) or new (controls) moon during scotophase. Rearing fish under these conditions for 1 month resulted in successful spawning in the experimental group between 21h00 and 01h30. Similar results were obtained when control fish were subdivided into artificial full and new moon groups and reared for an additional month. Fish in the experimental group had a high gonadosomatic index and abundant yolk-laden oocytes in the ovary. Therefore, moonlight triggers gonadal development and subsequent spawning in lunar-synchronized fish with a full-moon preference.
{"title":"Induction of spawning under artificial moonlight in the honeycomb grouper Epinephelus merra, a lunar-synchronized spawner","authors":"Kodai Fukunaga, Y. Takeuchi, C. Yamauchi, A. Takemura","doi":"10.1080/09291016.2022.2046416","DOIUrl":"https://doi.org/10.1080/09291016.2022.2046416","url":null,"abstract":"ABSTRACT In the reproductive season, lunar-synchronized fish spawn during species-specific moon phases. It remains unknown how they perceive cues from the moon for initiating gonadal development and subsequent spawning. We hypothesized that fish use moonlight to synchronize reproductive events. Using the honeycomb grouper Epinephelus merra, a tropical Serranidae, spawns around the time of the full moon, we report the successful induction of spawning in this species by controlling light condition at night. Following 3 months of acclimatization under long days (14:10) at 28 ± 1.0°C, mature fish were reared under an artificial full (experimental group) or new (controls) moon during scotophase. Rearing fish under these conditions for 1 month resulted in successful spawning in the experimental group between 21h00 and 01h30. Similar results were obtained when control fish were subdivided into artificial full and new moon groups and reared for an additional month. Fish in the experimental group had a high gonadosomatic index and abundant yolk-laden oocytes in the ovary. Therefore, moonlight triggers gonadal development and subsequent spawning in lunar-synchronized fish with a full-moon preference.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45154696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT This study explored the related factors affecting the circadian rhythm of blood pressure in patients with essential hypertension. According to blood pressure rhythm, 1007 patients with essential hypertension were divided into dipper (n = 332) and non-dipper group (n = 675). Age, gender, height and other basic information were collected, BMI was calculated, and FPG, TG, TC and other indicators were recorded. Meanwhile, carotid ultrasound, office BP, central hemodynamic parameters, and other indicators were recorded. Logistic regression was used. In comparison, dSBP, dDBP, nSBP, nDBP, nocturnal systolic blood pressure and nocturnal diastolic blood pressure drop rate, 24 hSSD, 24 hDSD and dSSD were statistically significant (P < 0.05). The results showed no distinct differences in CSP, CDP, CPP, AP, Aix and AIx75 in CAP between two groups (P > 0.05). Log regression analysis showed that for every increase in nocturnal SBP, dipper hypertension was more likely to occur than non-dipper hypertension. Circadian rhythm of blood pressure of hypertension in patients with essential hypertension is mainly the influence of circadian blood pressure and nocturnal blood pressure drop rate, especially for the nocturnal systolic blood pressure, so effective control of blood pressure at night could make the circadian rhythm of blood pressure tend to be in dipper type distribution.
{"title":"Study on the related factors affecting the circadian rhythm of blood pressure in patients with essential hypertension","authors":"Muyesaier Maimaitiming, Ping Liang, Mengpo Bai, Huijuan Liu, Xiaohui Liang","doi":"10.1080/09291016.2022.2044630","DOIUrl":"https://doi.org/10.1080/09291016.2022.2044630","url":null,"abstract":"ABSTRACT This study explored the related factors affecting the circadian rhythm of blood pressure in patients with essential hypertension. According to blood pressure rhythm, 1007 patients with essential hypertension were divided into dipper (n = 332) and non-dipper group (n = 675). Age, gender, height and other basic information were collected, BMI was calculated, and FPG, TG, TC and other indicators were recorded. Meanwhile, carotid ultrasound, office BP, central hemodynamic parameters, and other indicators were recorded. Logistic regression was used. In comparison, dSBP, dDBP, nSBP, nDBP, nocturnal systolic blood pressure and nocturnal diastolic blood pressure drop rate, 24 hSSD, 24 hDSD and dSSD were statistically significant (P < 0.05). The results showed no distinct differences in CSP, CDP, CPP, AP, Aix and AIx75 in CAP between two groups (P > 0.05). Log regression analysis showed that for every increase in nocturnal SBP, dipper hypertension was more likely to occur than non-dipper hypertension. Circadian rhythm of blood pressure of hypertension in patients with essential hypertension is mainly the influence of circadian blood pressure and nocturnal blood pressure drop rate, especially for the nocturnal systolic blood pressure, so effective control of blood pressure at night could make the circadian rhythm of blood pressure tend to be in dipper type distribution.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44819292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-24DOI: 10.1080/09291016.2022.2045058
Beatriz Marques Silva, S. Carvalho Bos, António José Vilar Queirós, A. Macedo
ABSTRACT The aim of our study was to explore the contribution of psychological factors for healthy sleep within a sample of one hundred employees (M= 43.4 ± 9.91 years; 74% female) with regular working schedules. Participants completed a set of questionnaires about sociodemographic characteristics, lifestyle behaviours, sleep times, healthy sleep, insomnia, sleep hygiene behaviours, personality traits, work-related cognitions, mood and well-being. Descriptive, correlational and multiple linear regression analyses were performed. Extraversion, perception that work effort was properly rewarded, job autonomy, satisfaction with working conditions, vigour-activity, friendship and well-being were positively associated with healthy sleep; arousal predisposition, neuroticism, can't stop thinking of work, rumination, worry, depression-dejection, tension-anxiety, confusion-bewilderment and fatigue-inertia were negatively associated. Multiple linear regression analyses identified four factors that mostly contributed to healthy sleep (41.3%): neuroticism (R2 = .245, p< .001), worry during sleep (R2 change= .094 p= .001), well-being (R2 change= .044, p= .016) and job autonomy (R2 change= .030, p= .041). Employees with lower levels of neuroticism, less worry during the night, better well-being and higher autonomy at work experienced healthier sleep. To promote healthy sleep among employees with regular/daytime working hours it might be important to consider personality traits, work-related cognitions and well-being.
{"title":"Psychological factors and healthy sleep in a Portuguese sample of employees with regular working hours","authors":"Beatriz Marques Silva, S. Carvalho Bos, António José Vilar Queirós, A. Macedo","doi":"10.1080/09291016.2022.2045058","DOIUrl":"https://doi.org/10.1080/09291016.2022.2045058","url":null,"abstract":"ABSTRACT The aim of our study was to explore the contribution of psychological factors for healthy sleep within a sample of one hundred employees (M= 43.4 ± 9.91 years; 74% female) with regular working schedules. Participants completed a set of questionnaires about sociodemographic characteristics, lifestyle behaviours, sleep times, healthy sleep, insomnia, sleep hygiene behaviours, personality traits, work-related cognitions, mood and well-being. Descriptive, correlational and multiple linear regression analyses were performed. Extraversion, perception that work effort was properly rewarded, job autonomy, satisfaction with working conditions, vigour-activity, friendship and well-being were positively associated with healthy sleep; arousal predisposition, neuroticism, can't stop thinking of work, rumination, worry, depression-dejection, tension-anxiety, confusion-bewilderment and fatigue-inertia were negatively associated. Multiple linear regression analyses identified four factors that mostly contributed to healthy sleep (41.3%): neuroticism (R2 = .245, p< .001), worry during sleep (R2 change= .094 p= .001), well-being (R2 change= .044, p= .016) and job autonomy (R2 change= .030, p= .041). Employees with lower levels of neuroticism, less worry during the night, better well-being and higher autonomy at work experienced healthier sleep. To promote healthy sleep among employees with regular/daytime working hours it might be important to consider personality traits, work-related cognitions and well-being.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43083985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-24DOI: 10.1080/09291016.2022.2044629
D. Hill, H. Chtourou
ABSTRACT The purpose of this study was to investigate the effects of one night’s sleep loss on mood state and exercise performance, for the purpose of identifying relationships between mood state and performance. A within-subjects repeated-measures design was used. Seven women (21 ± 2 y, 164 ± 9 cm, 62 ± 14 kg) participated. They completed Profile of Mood States questionnaires and performed exhaustive extreme intensity cycle ergometer tests (310 ± 70 W) before, and on three consecutive days following, one night’s sleep loss. Mean time to exhaustion was not affected by sleep loss. Mean total mood state disturbance was elevated on days 1 and 2 after sleep loss compared to baseline. There were strong correlations (r > 0.82) between individual changes (day 1 minus baseline, day 2 minus baseline, day 3 minus baseline) in time to exhaustion and individual changes in mood state: changes in time to exhaustion were associated with changes in the fatigue subscore on day 1; with changes in the vigour subscore on day 2, and with changes in the fatigue subscore on day 3. These results demonstrate a relationship, which may or may not reflect causality, between mood state and performance.
{"title":"Sleep loss, mood state, and performance of extreme intensity cycling exercise","authors":"D. Hill, H. Chtourou","doi":"10.1080/09291016.2022.2044629","DOIUrl":"https://doi.org/10.1080/09291016.2022.2044629","url":null,"abstract":"ABSTRACT The purpose of this study was to investigate the effects of one night’s sleep loss on mood state and exercise performance, for the purpose of identifying relationships between mood state and performance. A within-subjects repeated-measures design was used. Seven women (21 ± 2 y, 164 ± 9 cm, 62 ± 14 kg) participated. They completed Profile of Mood States questionnaires and performed exhaustive extreme intensity cycle ergometer tests (310 ± 70 W) before, and on three consecutive days following, one night’s sleep loss. Mean time to exhaustion was not affected by sleep loss. Mean total mood state disturbance was elevated on days 1 and 2 after sleep loss compared to baseline. There were strong correlations (r > 0.82) between individual changes (day 1 minus baseline, day 2 minus baseline, day 3 minus baseline) in time to exhaustion and individual changes in mood state: changes in time to exhaustion were associated with changes in the fatigue subscore on day 1; with changes in the vigour subscore on day 2, and with changes in the fatigue subscore on day 3. These results demonstrate a relationship, which may or may not reflect causality, between mood state and performance.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47427719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-21DOI: 10.1080/09291016.2022.2043588
N. Hu, Changyue Yu, Jiaxin Jin, Xinmiao Zhao, Yingying Zhao, Hua Wei, Yingdong Li
ABSTRACT Many physiological activities in amphibians show rhythmic changes to adapt to ambient light conditions. However, the effects of photoperiod variation on the immune and antioxidant status and their possible correlation with different tissues have not been reported in Dybowski’s frog, Rana dybowskii. In this study, the specific activities of immune and antioxidant enzymes in R. dybowskii under different photoperiods were evaluated. The results demonstrated that the photoperiod significantly impacted antioxidant enzymes and immune enzymes in Dybowski’s frog. In terms of antioxidant enzyme activity, catalase (CAT) and superoxide dismutase (SOD) activities in frogs at 6 L:18D and 0 L:24D were significantly higher than those at 18 L:6D and 24 L:0D, respectively. Further, the activities of these enzymes increased during the dark phase and decreased during the light phase. The malondialdehyde (MDA) content decreased significantly with the decrease in photoperiod time. Lysozyme (LZM) activity in serum and the liver decreased with a prolonged photoperiod. LZM activity in the dark cycle was higher, but the peak activity in skin occurred at noon. Thus, long-term light exposure may cause oxidative stress in Dybowski’s frog. Accordingly, a 6 L:18D photoperiod may be suitable for optimum physiological functions of this species.
{"title":"Impact of photoperiods on the specific activities of immune and antioxidant enzymes in different tissues of Dybowski’s frog (Rana dybowskii)","authors":"N. Hu, Changyue Yu, Jiaxin Jin, Xinmiao Zhao, Yingying Zhao, Hua Wei, Yingdong Li","doi":"10.1080/09291016.2022.2043588","DOIUrl":"https://doi.org/10.1080/09291016.2022.2043588","url":null,"abstract":"ABSTRACT Many physiological activities in amphibians show rhythmic changes to adapt to ambient light conditions. However, the effects of photoperiod variation on the immune and antioxidant status and their possible correlation with different tissues have not been reported in Dybowski’s frog, Rana dybowskii. In this study, the specific activities of immune and antioxidant enzymes in R. dybowskii under different photoperiods were evaluated. The results demonstrated that the photoperiod significantly impacted antioxidant enzymes and immune enzymes in Dybowski’s frog. In terms of antioxidant enzyme activity, catalase (CAT) and superoxide dismutase (SOD) activities in frogs at 6 L:18D and 0 L:24D were significantly higher than those at 18 L:6D and 24 L:0D, respectively. Further, the activities of these enzymes increased during the dark phase and decreased during the light phase. The malondialdehyde (MDA) content decreased significantly with the decrease in photoperiod time. Lysozyme (LZM) activity in serum and the liver decreased with a prolonged photoperiod. LZM activity in the dark cycle was higher, but the peak activity in skin occurred at noon. Thus, long-term light exposure may cause oxidative stress in Dybowski’s frog. Accordingly, a 6 L:18D photoperiod may be suitable for optimum physiological functions of this species.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48496758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-15DOI: 10.1080/09291016.2022.2041797
M. Hoshikawa
ABSTRACT The purpose of this study was to examine the correlation between the Munich ChronoType Questionnaire (MCTQ) index and time at minimum core temperature. Nine athletes were requested to answer the MCTQ questionnaire and monitor their core temperature during night. In the MCTQ, the midpoint of sleep on free day, which is corrected for sleep debt accumulated during the workweek (MSFsc), was calculated. The core temperature was monitored using a telemetric system with an ingestible capsule-type sensor. The correlation between the MSFsc and the time at the lowest core temperature was examined. The range of MSFsc and time at minimum core temperature were 2.54–7.75 (mean ±SE: 4.54 ± 0.52, 95%CI: 3.52–5.55) and 3:43–7:41 (mean ±SE: 5:24 ± 0:32, 95%CI: 4:21–6:27), respectively. Four participants with their MSFsc later than 4.96 showed times at minimum core temperature later than 6:00. A significant correlation between the MSFsc and time at minimum core temperature was observed, with a very high correlation coefficient (r = 0.86, p < 0.01). These results suggest that the MSFsc may be useful to find athletes who have a better chance to advance their circadian rhythmicity for morning competitions.
{"title":"Relationships between the Munich Chronotype questionnaire index and time at minimum core temperature","authors":"M. Hoshikawa","doi":"10.1080/09291016.2022.2041797","DOIUrl":"https://doi.org/10.1080/09291016.2022.2041797","url":null,"abstract":"ABSTRACT The purpose of this study was to examine the correlation between the Munich ChronoType Questionnaire (MCTQ) index and time at minimum core temperature. Nine athletes were requested to answer the MCTQ questionnaire and monitor their core temperature during night. In the MCTQ, the midpoint of sleep on free day, which is corrected for sleep debt accumulated during the workweek (MSFsc), was calculated. The core temperature was monitored using a telemetric system with an ingestible capsule-type sensor. The correlation between the MSFsc and the time at the lowest core temperature was examined. The range of MSFsc and time at minimum core temperature were 2.54–7.75 (mean ±SE: 4.54 ± 0.52, 95%CI: 3.52–5.55) and 3:43–7:41 (mean ±SE: 5:24 ± 0:32, 95%CI: 4:21–6:27), respectively. Four participants with their MSFsc later than 4.96 showed times at minimum core temperature later than 6:00. A significant correlation between the MSFsc and time at minimum core temperature was observed, with a very high correlation coefficient (r = 0.86, p < 0.01). These results suggest that the MSFsc may be useful to find athletes who have a better chance to advance their circadian rhythmicity for morning competitions.","PeriodicalId":9208,"journal":{"name":"Biological Rhythm Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45040607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-14DOI: 10.1080/09291016.2022.2041289
M. Borisenkov, S. Popov, V. Smirnov, D. Gubin, I. Petrov, T. Vasilkova, S. Solovieva, E. Martinson, Anna A Pechеrkina, O. Dorogina, E. Symaniuk
ABSTRACT The aim of this study is to evaluate the associations among time perspective, sleep-wake rhythm characteristics, and psycho-emotional state during COVID-19 isolation. The study was carried out from April 17 to 14 June 2020and involved 844 people aged 17 to 26 years (average age: 19.4 ± 1.8 years, women: 79.4%). Each study participant filled out the Zimbardo Time Perspective Inventory, the Munich ChronoType Questionnaire, and Beck Depression Inventory. There were significant changes in the sleep characteristics during isolation: sleep duration increased by 56 minutes, sleep efficiency decreased by 2.4%, sleep phase delayed by 53 minutes, while social jetlag decreased by 77 minutes. Individuals with balanced, future, and past positive time perspective had better sleep characteristics, and were less likely to exhibit symptoms of depression. Persons with past negative, present hedonistic and present fatalistic time perspective were more likely to have worse sleep characteristics, and exhibited signs of depression. The results of the study indicate that persons focused on long-term planning for their lives generally endured the COVID-19 isolation more easily.
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