Dennis L. Eggett’s research while affiliated with Brigham Young University and other places

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Publications (228)


Study design. Format of the 6 week, 2-arm crossover design
Assessment of a multi-ingredient dietary supplement on sleep quality: a randomized, double-blinded, placebo-controlled crossover clinical study
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February 2025

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Sleep Science and Practice

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Background Sleep disorders, specifically insomnia, are recognized as global public health concerns. The present study is to evaluate the potential effects of a multi-ingredient formula through a multimodal approach on sleep quality in people with insomnia. The study supplement contained bovine colostrum and egg yolk extracts, ashwagandha root extract, lavender oil, pyridoxal-5-phosphate, melatonin, GABA, and magnesium. Colostrum and egg yolk extracts have been shown to support immune system function and thus likely support sleep health. Ashwagandha root extract, lavender oil, pyridoxal-5-phosphate, melatonin, GABA, and magnesium have been shown to help sleep health and quality via different mechanisms of action. Methods A total of 30 healthy adults with self-reported symptoms of insomnia, divided into placebo and treatment groups, completed a 6-week randomized, double-blinded, placebo-controlled crossover study (1-week washout, 2-week intervention, 1-week washout, and 2-week intervention, sequentially). Participants were instructed to fill out Insomnia Severity Index (ISI) and the Leeds Sleep Evaluation Questionnaire (LSEQ) survey weekly, and keep a sleep diary daily, which were used to assess their sleep quality. Saliva samples were taken from participants before and after each 2-week treatment period to measure salivary melatonin level. Participants were instructed to wear a Fitbit Inspire 2 device to track their sleep and wake data. Linear mixed model ANOVA was used to evaluate statistics for the study. Results Study supplement significantly improved sleep quality of participants compared to placebo group, specifically difficulty falling asleep (p < 0.01). The study supplement also significantly improved the number of awakenings during the night compared to baseline (p < 0.01). Overall sleep health was improved, specifically sleep quality (wakefulness) (p < 0.01). Study supplement also significantly improved salivary melatonin levels compared to placebo group (p < 0.01). Some limitations of the study include a lack of controlled environment and a heterogeneous population, among others. Conclusions The preliminary findings observed in the present study showed that the study supplement improved sleep health and quality for people with insomnia. The importance of finding effective and safe solutions for poor sleep and insomnia cannot be overstated. Study registration ClinicalTrials.gov NCT05368909 “Clinical Study to Assess a Dietary Supplement on Sleep Health and Quality “, registered May 10, 2022. https://clinicaltrials.gov/study/NCT05368909.

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Timeline of survey development and revisions
Demographic characteristics of college students from four universities across the United States who participated in phase 3 cognitive interviews
Demographic characteristics of college students from four universities across the United States who participated in phase 4 reliability testing
Development, validation, and reliability testing of the College Perspectives around Food Insecurity survey

January 2025

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9 Reads

The objective of this study was to develop and to test the validity and reliability of a survey aimed to evaluate internal and external factors associated with college food insecurity. Researchers used a mixed methods approach to evaluate the College Perspectives around Food Insecurity survey. Survey items were constructed from interview data and assigned a social cognitive theory concept (environment, personal, or behavior). Two rounds of expert reviews established content validity (Round 1, n = 3; Round 2, n = 2). Researchers evaluated face validity through two rounds of cognitive interviews with college students 18+ years old (Round 1, n = 9; Round 2, n = 16) and tested survey reliability (n = 105). Researchers used descriptive statistics, test-retest reliability statistics, and Cronbach’s alpha scores for data analysis. The initial survey contained 143 items. After feedback from expert reviewers and cognitive interviews, the final survey contained 99 items. Test-retest reliability was 0.99, and Cronbach’s alpha scores were 0.74 for environment, 0.47 for personal, and 0.39 for behavior. The College Perspectives around Food Insecurity survey can be used to better understand internal and external factors associated with food insecurity in college students, which can inform interventions aimed at assisting this population.



Evaluating Signal Preemption Requests in Utah Using Vehicle-to-Everything Dedicated Short-Range Communication Equipped Snowplows

January 2024

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1 Citation

Transportation Research Record Journal of the Transportation Research Board

At the start of the 2019 to 2020 snow season, vehicle-to-everything (V2X) systems using dedicated short-range communication (DSRC) were placed on Utah Department of Transportation snowplows and traffic signal controllers on selected state routes. This study was conducted to understand the overall impacts of snowplows using V2X DSRC to request signal preemption. Roadside units (RSUs) were deployed on five corridors throughout the Salt Lake metropolitan area. Similar routes without RSUs were selected as a control and were used in the analysis to quantify results. Each snowplow on these corridors was equipped with an onboard unit (OBU). Based on data collected, analysis was performed on both traffic signal performance and vehicle performance data. Within the traffic signal performance analysis, it was found that the V2X DSRC system was utilized often, with snowplows requesting preemption in more 50% of the occasions they approached a signalized intersection. Of those requests, signal controllers granted preemption in over 80% of cases. On average, signal controller coordination was affected for less than 5 min. The vehicle performance analysis found that the snowplows on equipped routes had travel speeds that were less affected when there was snow than on corresponding not-equipped routes. Vehicle crash data also showed that there was a greater decrease in crashes on equipped routes than not-equipped routes. Anecdotal evidence gathered from snowplow drivers indicated that snowplows stopped less when using signal preemption. Drivers also noted a benefit to overall snow removal operations on corridors equipped with the V2X DSRC system.



Figure 3. Comparison of traffic volume between ATSPM and CCS data for: (a) signal 6421 vs. North University Avenue CCS; (b) signal 6306 vs. 800 East CCS.
A Methodology to Detect Traffic Data Anomalies in Automated Traffic Signal Performance Measures

October 2023

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2 Citations

Future Transportation

Automated traffic signal performance measures (ATSPMs) have garnered significant attention for their ability to collect and evaluate real-time and historical data at signalized intersections. ATSPM data are widely utilized by traffic engineers, planners, and researchers in various application scenarios. In working with ATSPM data in Utah, it was discovered that five types of ATSPM data anomalies (data switching, data shifting, data missing under 6 months, data missing over 6 months, and irregular curves) were present in the data. To address the data issues, this paper presents a method that enables transportation agencies to automatically detect data anomalies in their ATSPM datasets. The proposed method utilizes the moving average and standard deviation of a moving window to calculate the z-score for traffic volume data points at each timestamp. Anomalies are flagged when the z-score exceeds 2, which is based on the data falling within two standard deviations of the mean. The results demonstrate that this method effectively identifies anomalies within ATSPM systems, thereby enhancing the usability of data for engineers, planners, and all ATSPM users. By employing this method, transportation agencies can improve the efficiency of their ATSPM systems, leading to more accurate and reliable data for analysis.




Nonnative ungulate impacts on greater sage-grouse late brood-rearing habitat in the Great Basin, USA

August 2023

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121 Reads

Human-Wildlife Interactions

Domestic livestock grazing is the dominant land use on much of the current range inhabited by greater sage-grouse (Centrocercus urophasianus; sage-grouse) in the western United States. Nonnative feral horses (Equus ferus caballus) also inhabit important sage-grouse seasonal habitats. Overabundant feral horse populations and improper grazing by domestic cattle (Bos taurus) can impact the health of sagebrush (Artemisia spp.) and desert shrub rangeland communities and native wildlife. These impacts to sage-grouse can be exacerbated when they affect late brood-rearing habitat, which provide the forbs and arthropods required to fledge broods. Managers require better information regarding the extent of these impacts. In 2020, we assessed the potential impact of feral horses and domestic cattle on sage-grouse late brood-rearing habitats in western Utah and eastern Nevada, USA. We acquired late brood-rearing location data from sage-grouse marked with global positioning system and very-high frequency radio-transmitters from both east and west Nevada data to delineate late brood-rearing habitats. Using these location data, we compared 8 sites (4 pairs) within horse and non-horse use areas to assess sage-grouse habitat quality characteristics between areas that have been predominantly horse and cattle grazed versus sites that have been predominantly cattle grazed. For each pairing, 1 site was located within and the other outside of a Bureau of Land Management herd management area boundary, and both sites shared similar habitat characteristics (i.e., topography, dominant vegetation, soils, and climate) and selection probability for broods. We collected vegetation and dung count data at each site to assess characteristics related to habitat quality for sage-grouse brood-rearing, based on ungulate presence. We used a mixed model analysis of variance to detect differences between each paired site comparison (α < 0.01). Horses or evidence of horse presence (i.e., dung) were not detected at our non-horse sites allowing for an unbiased comparison between paired sites. Cattle presence was noted at all our paired sites. Average annual grass frequency was 0.74 in horse and 0.17 in non-horse use areas (P = 0.20), and average annual grass cover was 4.0% compared to 0.2% in horse use areas (P = 0.32). Average annual grass biomass was 0.45 kg/ ha in horse and 0.04% in non-horse use areas (P = 0.34). Vegetation height was 44.2 cm in non-horse compared to 34.5 cm in horse use areas (P = 0.23). These results suggest that increased ungulate grazing and year-long use of late brood-rearing habitat by feral horses coupled with livestock grazing may impair habitat suitability, particularly considering ecological impacts from invasive plant species. Our results suggest that managing late brood-rearing habitats to reduce the frequency and intensity of year-long grazing by feral horses can be best accomplished by reducing horse numbers and the seasonal distribution of grazing by domestic livestock.


Modeling of the chest wall response to prolonged bracing in pectus carinatum

August 2023

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72 Reads

Pectus carinatum is a chest wall deformity that is often treated through the wearing of an external brace. The treatment of the deformity could benefit from a greater understanding of chest wall characteristics under prolonged loading. These characteristics are difficult to model directly but empirical studies can be used to create statistical models. 185 patients from 2018-2020 received bracing treatment. Data on the severity of the deformity, treatment pressures, and time of wear were recorded at the first fitting and all subsequent follow-up visits. This data was analyzed using a statistical mixed effects model to identify significant measures and trends in treatment. These models were designed to help quantify changes in chest wall characteristics through prolonged bracing. Two statistical models were created. The first model predicts the change in the amount of pressure to correct the deformity after bracing for a given time and pressure. The second model predicts the change in pressure response by the body on the brace after bracing for a given time and pressure. These models show a high significance in the amount of pressure and time to the changes in the chest wall response. Initial deformity severity is also significant in changes to the deformity. The statistical models predict general trends in pectus carinatum brace treatment and can assist in creating treatment plans, motivating patient compliance, and can inform the design of future treatment systems.


Citations (70)


... This situation requires innovative solutions to improve traffic management and reduce inefficiencies in the urban transportation systems [2]. Adaptive traffic signal control systems (ATCSs) integrate advanced technologies like Vehicle-to-Everything (V2X) communication, the Internet of Things (IoT), and predictive analytics, giving a promising approach to overcome these challenges [3]. Figure 1 presents the visual representation of the relationship between ATCS and AI, IoT and predictive analytics. ...

Reference:

Revolutionizing Urban Mobility: A Systematic Review of AI, IoT, and Predictive Analytics in Adaptive Traffic Control Systems for Road Networks
Evaluating Signal Preemption Requests in Utah Using Vehicle-to-Everything Dedicated Short-Range Communication Equipped Snowplows
  • Citing Article
  • January 2024

Transportation Research Record Journal of the Transportation Research Board

... Automated Traffic Signal Performance Measures (ATSPMs) have garnered significant attention for their capability to collect and assess real-time and historical data at signalized intersections. ATSPM data is widely utilized by traffic engineers, planners, and researchers in various applications scenarios [9] [10]. This paper discusses some of the common ATSPM datasets used by NoTraffic™ : ...

A Methodology to Detect Traffic Data Anomalies in Automated Traffic Signal Performance Measures

Future Transportation

... Kimberly (2021) concluded that reduced hip mobility can result in decreased ability to perform task specific FMS movements which implies that hip ROM is also essential for physical activities. 20 Hip flexion is a predictor for assessment of risk for injuries as hip flexion tightness shows altered running mechanics marked by early toe off, less flexion and extension angles as stated by Augsberg et al., (2019) 21 .There are also other studies supporting this evidence as abdominal strains have been reported in female tennis players with hip flexor tightness. To prevent strain stretching can be indicated as mentioned by Simon W. Young (2014) Hence measurement of hip range is essential and such data can be used during baseline assessment to prevent the risk of sport injuries. ...

The Relationship Between Hip Mobility And Performance On The Functional Movement Screen In Apparently Healthy Older Adults: 2156
  • Citing Article
  • September 2023

Medicine and Science in Sports and Exercise

... (Reeves et al., 2023;Schuetz et al., 2020). However, recent studies imply that the design features of information-security-promoting materials and the characteristics of the corresponding protection task may interact to influence recipients' protection behaviors (Schuetz et al., 2021;Vance et al., 2022). The relative effectiveness of different antiphishing training materials can be more complex, depending on the characteristics of the phishing messages at hand and individuals' perceptions of those messages. ...

Do Security Fear Appeals Work When They Interrupt Tasks? A Multi-Method Examination of Password Strength
  • Citing Article
  • September 2022

MIS Quarterly

... Younger family historians were also more liable to become distressed while exploring their ancestry, possibly because sense of identity is less stable/more vulnerable at younger ages-although 'younger' in the context of this sample is still quite elderly. A study by Haydon et al. (2023) concluded that family history knowledge may influence components of identity development in adolescence; however, its role in influencing identity in middle and later years is as yet unknown. ...

Identity Development and Its Relationship to Family History Knowledge among Late Adolescents

Genealogy

... A year later, Tafuna'i and colleagues (Tafuna'i et al., 2021) specifically designed a study to investigate the limb difference in AOP and found that the mean AOP differed between the dominant and ondominant legs for males but not for females. However, this statistically significant difference in AOP between legs has not been replicated in more recently published studies that classified legs on dominancy (Vehrs et al., 2023a(Vehrs et al., , 2023b or right/left (Evin et al., 2021;Hughes et al., 2021;Montoye et al., 2024). Thus, there is an inconsistent finding regarding the mean difference in AOP between legs. ...

Comparison of Two Cuff Inflation Protocols to Measure Arterial Occlusion Pressure in Males and Females

Applied Sciences

... Blue LED light has 40 % more energy than red light [104] and controls key enzymes in triglyceride accumulation in photosynthesis [105]. The red light emits twice and three times as many photos as blue and green lights, Gal et al. [102] respectively [104]. Chlorophyll a and b readily absorb the energy provided by red light [104], while high carbon conversion efficiency is supported by red light [105]. ...

Growth comparison of Arthrospira platensis in different vessels: standard cylinder vs. enhanced surface area at low light

Applied Phycology

... The habitats, named based on their dominant species, were pinyon/juniper (native), sagebrush (native), cheatgrass (non-native invasive), and crested wheatgrass (non-native revegetated). The associations of these two species, P. minuta with pinyon/juniper habitat and P. quadratis with cheatgrass habitat, have been shown to be statistically significant [3], with most occurrences of both species found at the Yuba Valley site. The data points from these associations provided the limited extent of known distribution for these species. ...

Seasonal Trap Abundance of Two Species of Psilochalcis Kieffer (Hymenoptera: Chalcididae) in Rangelands of the Eastern Great Basin of Utah, USA

Land

... Mosher et al. (2022) conducted an in-depth analysis exploring the impact of immersive technologies, such as mixed reality and extended reality, on students with autism spectrum disorders, specifically in relation to emotional recognition, social awareness, and collaboration skills. Meanwhile, Polychronis et al. (2023) reviewed studies on embedded video modeling techniques to increase eye contact and improve social interaction abilities in students with autism spectrum disorders. ...

Use of an App With Embedded Video Modeling to Increase Eye Contact
  • Citing Article
  • September 2022

Focus on Autism and Other Developmental Disabilities

... However, El Ayoubi, et al. (2021) argued that some adolescents use pills to delay their menses in order to attend marriages, religious ceremonies, festivals, examinations, and outings. Fleischer et al. (2022) also revealed that frequently taking pills to delay periods affects future menstrual cycles and overall reproductive health which can make the regular menstrual cycle go fuddled. It can also lead to heavy bleeding and serious health conditions. ...

Association of Short-Term Changes in Menstrual Frequency, Medication Use, Weight and Exercise on Bone Mineral Density in College-Aged Women