Personal Factors, Perceptions, Influences and Their Relationship with Adherence Behaviors in Patients with Diabetes

Problem and significance: Adherence to health-promoting behaviors in a diabetes self-care regimen is essential for individuals with diabetes and can assist providers and individuals with diabetes management. The purpose of this research was to explore the relationship between personal factors (age, length of diabetes diagnosis, perceived health status, weight), perceived barriers to action (number of barrier days), interpersonal influences (social support), situational influences (depressive symptoms), and patient adherence to health-promoting behaviors (blood glucose monitoring, diet, and exercise) and health outcomes ( A1c and body mass index) in a diabetes self-care regimen. Methods: A descriptive correlational analysis was performed using baseline data from the National Health and Nutrition Examination Survey (NHANES) [2007-2008]. Constructs from the Health Promotion Model were used to predict health-promoting behaviors and health outcomes in diabetes self-management. The 713 participants with diabetes were primarily Black or Hispanic (57.5%), older ( M 62.2 years, SD 12.9), and married or living with a partner (56.2%). Approximately half of the participants were female (50.8%); 59% were obese. Results: The longer the time since diagnosis and the more barrier days experienced per month, the more frequently blood glucose monitoring was performed (R2 = .076, R2adj = .060, F (6, 363) = 4.875, p \u3c .001). The greater the body weight, the more likely participants were to implement diet management behaviors (R2 = .097, R2adj = .081, F (7, 413) = 6.209, p \u3c .001). The younger the age and the higher perceived health status, the more minutes per week were spent in exercise (R2 = .054, R2adj = .038, F (7, 412) = 3.307, p \u3c .01). The older the age and the shorter time since diagnosis, the lower the A1c levels (R2 = .054, R2adj = .044, F (6, 568) = 5.391, p \u3c .001). The younger the age, the more barrier days per month and the more diet management behaviors reported, the higher the BMI (R2 = .149, R2adj = .140, F (6, 581) = 16.764, p \u3c .001). Findings indicate that treatment measures, not preventative, are being practiced, and that predictors of behaviors and outcomes are multifaceted and require further investigation

Complete Characterization of Stability of Cluster Synchronization in Complex Dynamical Networks

Synchronization is an important and prevalent phenomenon in natural and engineered systems. In many dynamical networks, the coupling is balanced or adjusted in order to admit global synchronization, a condition called Laplacian coupling. Many networks exhibit incomplete synchronization, where two or more clusters of synchronization persist, and computational group theory has recently proved to be valuable in discovering these cluster states based upon the topology of the network. In the important case of Laplacian coupling, additional synchronization patterns can exist that would not be predicted from the group theory analysis alone. The understanding of how and when clusters form, merge, and persist is essential for understanding collective dynamics, synchronization, and failure mechanisms of complex networks such as electric power grids, distributed control networks, and autonomous swarming vehicles. We describe here a method to find and analyze all of the possible cluster synchronization patterns in a Laplacian-coupled network, by applying methods of computational group theory to dynamically-equivalent networks. We present a general technique to evaluate the stability of each of the dynamically valid cluster synchronization patterns. Our results are validated in an electro-optic experiment on a 5 node network that confirms the synchronization patterns predicted by the theory.Comment: 6 figure

Synchronisation in networks of delay-coupled type-I excitable systems

We use a generic model for type-I excitability (known as the SNIPER or SNIC model) to describe the local dynamics of nodes within a network in the presence of non-zero coupling delays. Utilising the method of the Master Stability Function, we investigate the stability of the zero-lag synchronised dynamics of the network nodes and its dependence on the two coupling parameters, namely the coupling strength and delay time. Unlike in the FitzHugh-Nagumo model (a model for type-II excitability), there are parameter ranges where the stability of synchronisation depends on the coupling strength and delay time. One important implication of these results is that there exist complex networks for which the adding of inhibitory links in a small-world fashion may not only lead to a loss of stable synchronisation, but may also restabilise synchronisation or introduce multiple transitions between synchronisation and desynchronisation. To underline the scope of our results, we show using the Stuart-Landau model that such multiple transitions do not only occur in excitable systems, but also in oscillatory ones.Comment: 10 pages, 9 figure

Chimera-like states in modular neural networks

Chimera states, namely the coexistence of coherent and incoherent behavior, were previously analyzed in complex networks. However, they have not been extensively studied in modular networks. Here, we consider a neural network inspired by the connectome of the C. elegans soil worm, organized into six interconnected communities, where neurons obey chaotic bursting dynamics. Neurons are assumed to be connected with electrical synapses within their communities and with chemical synapses across them. As our numerical simulations reveal, the coaction of these two types of coupling can shape the dynamics in such a way that chimera-like states can happen. They consist of a fraction of synchronized neurons which belong to the larger communities, and a fraction of desynchronized neurons which are part of smaller communities. In addition to the Kuramoto order parameter ?, we also employ other measures of coherence, such as the chimera-like ? and metastability ? indices, which quantify the degree of synchronization among communities and along time, respectively. We perform the same analysis for networks that share common features with the C. elegans neural network. Similar results suggest that under certain assumptions, chimera-like states are prominent phenomena in modular networks, and might provide insight for the behavior of more complex modular networks

Homing Studies of Bank Swallows in Eastern Illinois

A series of homing experiments using 39 color-marked Bank Swallows (Riparia riparia) were carried out in eastern Illinois during the summer of 1975. The swallow colony was located four km east-northeast of Charleston, Illinois at the Charleston Stone Quarry. Eight release sites were located in the four compass directions from the home colony at distances of 14.4 to 32.3 km away. The colony was approached before dawn and swallows were captured using tube traps. Birds were color-marked, banded, and taken in individual bags to the release site by automobile. Cloud cover, wind velocity, wind direction, and orientation behavior were recorded for each release. Only 1/3 of the released birds successfully homed. Of the 13 that returned, eight homed from approximately 16 km north of the home site. There was a non-random final orientation between the north and northeast compass points (chi-square = 68.6; p\u3c1%). Approximately 59% of these birds flying north-northeast homed successfully. The fastest homing velocity was 7.2 km/hr. There seemed to be no correlation between weather conditions and homing success. Swallows homed successfully under both clear and cloudy skies, and some succeeded against strong winds. Returning swallows would typically approach the burrow several times, hesitate at the entrance, and finally enter the burrow. Almost immediately the swallow began to carry food or nesting material. Some evidence exists that landmark and compass orientation were used by the swallows which homed. Evidence that landmark orientation was used is supported by the fact that sites #1 and #5 both produced more successful returns than any other sites. This type of homing improvement is said to be typical of landmark orientation. Approximately 56% of the swallows released chose a north-northeast orientation which tends to support compass orientation. However, this orientation could · have been a nonsense one since this orientation was not the home direction for any of the birds which flew in that direction. Marking techniques were found to be inadequate because of poor visibility and low variability; therefore, homing success may have been better than the figures indicate. Possible solutions, although untested, include the use of colored streamers attached to the leg of the swallow or colored feathers glued to wing and tail coverts