Biological Rhythm Aware Office Lighting Control

We formulate the lighting control system as a mathematical optimization problem which is highly nonlinear and acts of a longer time interval. To this end we introduce an iterative optimization algorithm to achieve a solution. This method can be used to develop scalable human-centric smart lighting control systems centered towards bringing support to the biological rhythm of individual employees. We test the inter-person variability of the optimum light exposure, and concluded that theory predicts that there is no one-size-fits-all light recipe. In particular, individual differences in late-evening light exposure require differentiation in the late afternoon. Humans are different. Our evaluations show that standard deviations in biological difference (intrinsic period) and social behavior require different light recipes. That is, human centric lighting control based on population averages have much less effect, compared to algorithms that take human variation into account. Possible one-size-fits-all human centric lighting is inadequate to achieve the desired impact or may be counterproductive for specific humans.<br/

Biological Rhythm Aware Office Lighting Control

We formulate the lighting control system as a mathematical optimization problem which is highly nonlinear and acts of a longer time interval. To this end we introduce an iterative optimization algorithm to achieve a solution. This method can be used to develop scalable human-centric smart lighting control systems centered towards bringing support to the biological rhythm of individual employees. We test the inter-person variability of the optimum light exposure, and concluded that theory predicts that there is no one-size-fits-all light recipe. In particular, individual differences in late-evening light exposure require differentiation in the late afternoon. Humans are different. Our evaluations show that standard deviations in biological difference (intrinsic period) and social behavior require different light recipes. That is, human centric lighting control based on population averages have much less effect, compared to algorithms that take human variation into account. Possible one-size-fits-all human centric lighting is inadequate to achieve the desired impact or may be counterproductive for specific humans.<br/

Similarities of Aspects of Biological Rhythms between Major Depression and Bipolar II Disorder Compared to Bipolar I Disorder: A Finding from the Early-Onset Mood Disorder Cohort

OBJECTIVE: The biological rhythm is closely related to mood symptoms. The purpose of this study was to assess the differences in biological rhythms among subjects with mood disorder [bipolar I disorder (BD I), bipolar II disorder (BD II), major depressive disorder (MDD)] and healthy control subjects. METHODS: A total of 462 early-onset mood disorder subjects were recruited from nine hospitals. The controls subjects were recruited from the general population of South Korea. Subject groups and control subject were evaluated for the Korean language version of Biological Rhythms Interview of Assessment in Neuropsychiatry (K-BRIAN) at the initial evaluation. RESULTS: The mean K-BRIAN scores were 35.59 [standard deviation (SD)=13.37] for BD I, 43.05 (SD=11.85) for BD II, 43.55 (SD=12.22) for MDD, and 29.1 (SD=8.15) for the control group. In the case of mood disorders, biological rhythm disturbances were greater than that in the control group (p<0.05). A significant difference existed between BD I and BD II (BD I <BD II, p<0.001) and between BD I and MDD (BD I<MDD, p< 0.001) but no difference was observed between BD II and MDD. CONCLUSION: BD II and MDD are similar to each other but different from BD I in biological rhythm patterns in early-onset mood disorder cases. Biological rhythm disturbances are similar for early-onset major depression and BD II.ope

Effect of Biological Rhythm on Cognitive Performance

Biological rhythm has contributed in evolution process of humankind and has created certain distinct capabilities and preferences in shaping his phycho-psychological reactions. On the basis of behavioural activities, reactions, preferences and performances during the day-night cycle, individuals are classified in chronotype as morning type (M type) and evening type (E type). Such a differentiation has been hypothesised to contributing to individual differences at the cognitive, affective and conative levels. The present study was an attempt to further study such differentiation in terms of neuro cognitive performance by using the most advanced psycho-physiological measures. The participants of both chronotypes, morning and evening were classified and later subjected to cognitive testing by using the Cambridge Neuropsychological Test Automated Battery in the morning and the evening session under repeated measure design. The study revealed that performance on neuro cognitive functions; Planning and working memory, Decision-making and response control, and Motor skills get effected differently by their biological rhythm cycle and thus under performance in these functions can be attributed to maladaptation of biological rhythm termed as biological dysrhythmia. The study also highlights the role of this behavioural maladaptation in moderating operational efficiency of soldier in combat situation

Evaluation of the biological rhythm during physical, emotional and mental cycle

Finding the differences in the physical, emotional and metal capabilities at successive measurements according to daily curves of different Biological rhythms (day of birth, day of crest, descending to commencing line, descending to base line and going back to commencing line). Exploring the effect of measuring in different days of biological rhythm cycles on the correlations among physical, emotional and mental capabilities. Comparing the physical, emotional and mental of day of birth with these capabilities at different biological rhythm stages. The researchers used the descriptive methods. The sample was (24) students, aged (18-22) years. The following tests are used: Running test (50m), standard broad jump, sit-up, running and walking for 12 minutes, zigzag running 4x9 m, Bending the body forward and downward, stability balancing, shooting on interfered circles in handball, emotional tests, attention test to measure mental status by Burdon – Anvimov test. Statistical used, mean, standard deviation, simple and multiple correlation coefficients and t-test were used to analyze the data .The conclusions of study: There are significant differences between biological rhythm stages in flexibility tests between day of birth , day of descending to commencing line in favor of day of birth; crest day, day of descending to commencing line in favor of crest day ;and day of ending to commencing line and day of ascending to commencing line in favor of ascending to commencing line. There are significant differences for biological rhythm stages in emotional tests between day of birth, crest day in favor of day of birth and there were no significant differences between the remaining stages. There are significant differences for biological rhythm stages in balance test between day of birth, descending to bottom and ascending to commencing line in favor of these two stages. There are significant differences in sharpness of attention tests on date of crest and ascending to commencing line in favor of ascending to commencing line

Strength-training and biological rhythm of male sex hormone among judoists

Testosterone is a steroid hormone that is secreted by the testes with a diurnal rhythm and has a strong anti-catabolic (anabolic) effect on muscles. There is a strong relationship (r > 0.9) between concentrations of testosterone in the saliva and blood. The main purpose of the current study is to investigate the effect of strength-training on levels of salivary testosterone in male judoists. In a cross-sectional investigation, a population of 18 fit young male judoists (aged 17.0 ± 1.2 year, body mass 72 ± 3 kg, height 175 ± 3 cm, means ± SD), with at least 1.5 years of experience in judo classes was examined in Isfahan, Iran, in December, 2012. The period of testing consisted of two days of “rest” and two days of “exercise”. Subjects were randomly divided into two conditions that performed either the “rest” or “exercise” days during the first week, with the opposite type of day in the second week. The training regimen consisted of three repetitions of nine tasks, with 1 min of rest between each of the three sets, performed on alternate days for 8 weeks. Unstimulated saliva was collected (1–2 ml) every 2 h from 06:00 till 22:00 h. ANOVA with repeated measures was used to assess differences between the rest and exercise days. Strength-training sessions caused a significant decrease in testosterone levels immediately after exercise (p  0.05). It is concluded that strength-training does not significantly affect the normal biological rhythm of salivary testosterone during the waking period in male judoists

Wild clocks: preface and glossary

No abstract available

A 2-dimensional Geometry for Biological Time

This paper proposes an abstract mathematical frame for describing some features of biological time. The key point is that usual physical (linear) representation of time is insufficient, in our view, for the understanding key phenomena of life, such as rhythms, both physical (circadian, seasonal ...) and properly biological (heart beating, respiration, metabolic ...). In particular, the role of biological rhythms do not seem to have any counterpart in mathematical formalization of physical clocks, which are based on frequencies along the usual (possibly thermodynamical, thus oriented) time. We then suggest a functional representation of biological time by a 2-dimensional manifold as a mathematical frame for accommodating autonomous biological rhythms. The "visual" representation of rhythms so obtained, in particular heart beatings, will provide, by a few examples, hints towards possible applications of our approach to the understanding of interspecific differences or intraspecific pathologies. The 3-dimensional embedding space, needed for purely mathematical reasons, allows to introduce a suitable extra-dimension for "representation time", with a cognitive significance.Comment: Presented in an invited Lecture, conference "Biologie e selezioni naturali", Florence, December 4-8, 200