Assessing Ice Island Drift Patterns, Ice Island Grounding Locations, and Gridded Bathymetry Products between Nares Strait and the North Atlantic

Large, tabular icebergs known as “ice islands” frequently transit the eastern Canadian Arctic and sub-Arctic after breaking away from ice tongues in northern Greenland. Here, we mine the Canadian Ice Island Drift, Deterioration and Detection (CI2D3) Database to contribute a descriptive assessment of the drift and grounding locations of Petermann ice islands (PII) following calving events at the Petermann Glacier in 2008, 2010, and 2012. We also use the CI2D3 Database to demonstrate how gridded bathymetry products can be improved using observations of ice island grounding and knowledge of ice island thickness. We find that most PII fragments followed a common southbound drift route directed by outflow from the Arctic Ocean and the dominant Baffin and Labrador Currents, which are strongest along the steep continental shelf break. Smaller ice islands were more prone to drift into the deeper waters of central Baffin Bay. As previously noted by northern community members, ice islands were also observed to drift into many adjacent sounds, channels, inlets, and straits. PIIs often grounded on shoals in Kane Basin, to the east of Coburg Island, and along the southeast coast of Baffin Island. Potential inaccuracies in two gridded bathymetry products were located in Jones Sound, near Coburg Island, and along the east coast of Baffin Island. Our approach to identifying these potential inaccuracies is shown to be sensitive to the estimate of ice island keel depth. Overall, this work provides synthesized observations of ice island occurrence and grounding as well as an approach to improving bathymetry products in a resource-rich marine region where traffic and industry operations are increasing.

Let\u27s Go Live: Does Presentation Format Influence Perceived Authority Regarding Social Media Posts

Photographs, memes, text, and live streaming; they are all ways of sharing information through social media. Have you ever considered whether the transmission format affects the perceived authority of the post, and furthermore, would the authority of identical stories be perceived differently with various styles of social reporting? The researchers sought to answer that question and presented college students identical stories via a variety of social media reporting capabilities. They then asked them to rate the authority and usability of each post. This poster will share their results.https://ir.una.edu/libfacpresentation/1006/thumbnail.jp

Changes in Fat Mass, Fat Free Mass, Cardiorespiratory Fitness and Grip Strength Across a College Population

Research has shown that traditional college students are more physically fit at the beginning of their freshman year compared to their senior year. PURPOSE: The purpose of this data analysis is to examine how fat mass (FM), fat free mass (FFM), handgrip strength and VO2max change in a college-aged population. METHODS: A five-year cross-sectional design was used to assess a sample of college students (n=3,379; Males=55.4%; BMI: 25.2±5.7; Age:19.4±1.5) in an introductory wellness class. The range in age was 18-25 which were divided into four groups: 1=18-19yrs, 2=20-21yrs, 3=22-23yrs and 4=24-25yrs. Subjects were taken through the following screenings: height, weight, body fat percentage, grip strength, and estimated VO2Max. Body Fat was analyzed using a Tanita. Grip strength was assessed using a handgrip dynamometer. Estimated VO2max and heart rate recovery were assessed using the Tecumseh sub-maximal step test. One-way ANOVAs were conducted to examine changes in the estimated VO2max, FFM, FM and handgrip strength. RESULTS: Comparing the whole population across age groups, there was no significant change in FM and estimated VO2max. However, hand­grip strength (F(3,3103)=11.53,P\u3c0.001) and FFM (F(3,1357)=7.58,P\u3c0.001) did change across age groups. Students had a significant increase in handgrip strength from ages 18-19 (38.13 kg) to ages 24-25 (42.89 kg), re­spectively. Students also had an increase in FFM from ages 18-19 (57.10 kg) to ages 22-23 (61.82kg), respective­ly. CONCLUSION: The results demonstrated that college-aged students have both and increase and decrease in measures of fitness and body composition

Agreement Study Between the ParvoMedics TrueOne 2400 and Vacu-Med Vista MINI-CPX Metabolic Measurement System

Aerobic capacity (VO2 MAX) predicts both athletic performance and health status. Many tools are available to assess VO2 MAX ranging in both cost and accuracy. Understanding limitations of less expensive tools, likely found in settings such as health clinics or sports performance facilities, will help practitioners in developing accurate exercise prescriptions for their respective populations. To evaluate agreement lower cost VO2 MAX assessment tool (Vacu-Med Vista MINI-CPX) to the industry “gold standard” (ParvoMedics TrueOne 2400). Thirty-one participants (22.5 ± 3.5 years; BMI 24.9 ± 2.3; 51% female) completed two sessions of maximal VO2 MAX assessment using the Bruce Protocol graded treadmill exercise test. The first session of assessment utilized the “gold-standard” unit (TrueOne 2400, ParvoMedics, Inc., Murray, UT). 24-48 hours later the second unit (Vista Mini-CPX, Vacu-Med, Inc., Ventura, CA) was used to assess VO2 MAX again. A Bland-Altman analyses was used to evaluate both potential bias and agreement for between the two assessment tools. The CPX unit sig­nificantly overestimated VO2 MAX compared to the TrueOne (Bias = 10.67 ± 5.87 ml/kg/min, LoA = -0.83, 22.18; t = 1.96, p \u3c .001). However, the CPX unit demonstrates good reliability as 93.5% (29/31 participants) of values fell within the 95% LoA. Further, values above 46.5 ml/kg/min tend to be greater than the mean bias while those below tend to be lower than the mean bias (r = .605, F = 16.80, p \u3c .001). The CPX unit demon­strates good reliability yet a significant overestimation of aerobic capacity

Evaluating Novel Methods of Classifying Interlimb Asymmetries Within Collegiate American Football Players

International Journal of Exercise Science 15(6): 473-487, 2022. Over the last few years, researchers and sport scientists have expressed an increased interest in the effects of interlimb asymmetry on aspects of sport performance such as jumping, sprinting, and changing direction. This study aimed to evaluate the diagnostic utility of three different means of classifying asymmetry to highlight if a 6-week resistance training intervention can meaningfully reduce levels of asymmetry, and to determine the relation between asymmetry reduction and improvements in change of direction (CoD) performance, if any. Eighteen, division-two collegiate American football skill position players completed all pre- and post-intervention procedures. These procedures involved the completion of the Bulgarian Split Squat (BSS) exercise from which asymmetries in relative average power (Rel.AP), and relative peak power (Rel.PP) were derived. Additionally, participants completed three repetitions within the 505 and L-drill tests to quantify CoD performance. Results from our study show that participants classified as asymmetrical, exhibiting observed asymmetry in Rel.PP scores larger than the sample mean plus one standard deviation, had the greatest likelihood of reducing asymmetry (OR = 6.99, 95% CI: 1.4, 12.5) and improving L-drill performance (OR = 1.33, 95% CI: -2.1, 4.8). Further, our training intervention meaningfully reduced Rel.AP asymmetry (p = 0.027, Cohen’s d = 0.73). At the group level, these reductions in asymmetry were accompanied by improvements in L-drill performance that were larger than the sample smallest worthwhile change (SWC). At the individual level, however, change scores in asymmetry and change scores in CoD performance only showed small, non-significant correlations

Examining the Health Action Process Approach for Predicting Physical Activity Behavior in Adults with Back Pain

This study investigated the appropriateness of the Health Action Process Approach (HAPA) as it relates to physical activity (PA) behavior in the back pain population. The motivational and volitional constructs of the HAPA, PA, and back pain-related disability variables were assessed in a sample of 350 men and women with back pain. HAPA model fit was satisfactory accounting for 21% of the variance in PA intentions and 28% of PA behavior. All motivational phase constructs relate to PA intention. Action/coping planning and recovery self-efficacy do not relate to PA behavior. PA intentions are the strongest predictor of PA behavior. An expanded model, including disability-specific variables, satisfactorily fit the data, accounting for 32% of PA intentions and 29% of PA participation. These data partially support assumptions of the HAPA for the back pain population. For the back pain population, interventions designed to affect PA behavior must account for disability-specific variables

Exposure, hazard, and survival analysis of diffusion on social networks

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/144676/1/sim7658_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/144676/2/sim7658.pd

Incorporating a Sense of Community in a Group Exercise Intervention Facilitates Adherence

Participant attrition is detrimental for exercise intervention studies, particularly if dropout is not random. Community engagement has helped facilitate participant adherence, which is particularly applicable for group exercise programs. Developing a sense of community (SOC) helps participants feel that they belong and provides ongoing social support. This paper reports on strategies used during an 11-week high intensity functional training (HIFT) intervention with exceptionally high adherence (96.7%) that involved 30 participants (57% women, age 36.7 ± 4.5 years). Participants recorded their heart rate variability using a smartphone app daily throughout the study, completed three different weeks of fitness assessments, and attended six weeks of five days/week HIFT group exercise sessions led by a certified coach. Coaches used strategies to facilitate group interactions and individual feedback and engagement. Participants completed a follow-up survey that included 14 items from the SOC in sport scale (SCS), eight questions about group dynamics, and three open-ended study feedback questions that were coded using the SOC categories. All SCS items were highly rated (mean range = 4.51-4.93/5) as were the group dynamics items (mean range = 4.30-4.85/5). Common interests were the most mentioned SOC category in open-ended responses, and while the participants reported really enjoying the study, they provided constructive feedback for improving future studies. Using specific strategies to facilitate a SOC in exercise intervention research (e.g., group exercise, social media connections, and facilitating participant interactions) are recommended for both researchers and practitioners to avoid attrition and encourage adherence, particularly for programs with high daily participant burden

A stationary impulse-radar system for autonomous deployment in cold and temperate environments

L. Mingo acknowledges the SR&ED Tax Incentive Program of the CRA for offsetting some R&D costs of the sIPR. G. Flowers and D. Bigelow are grateful to NSERC, CFI, CSA, NSTP, PCSP and SFU for funding, Kluane First Nation, Yukon Government and Parks Canada for access to Yukon field sites and S. Williams, L. Goodwin, A. Pulwicki, J. Crompton,F. Beaud and Canadian astronaut D. Saint-Jacques for support and field assistance. C. Schoof and C. Rada provided time-lapse imagery and 2017 water-pressure data. A. Crawford and D. Mueller acknowledge funding from NSERC, Transport Canada, PKC/NSTP and the Garfield Weston Foundation, as well as support from Arctic Net, the CCGS Amundsen crew and pilots O. Talbot, A. Roy and G Carpentier.Stationary ice-penetrating radar (sIPR) systems can be used to monitor temporal changes in electromagnetically sensitive properties of glaciers and ice sheets. We describe a system intended for autonomous operation in remote glacial environments, and document its performance during deployments in cold and temperate settings. The design is patterned after an existing impulse radar system, with the addition of a fibre-optic link and timing module to control transmitter pulses, a micro-UPS (uninterruptable power supply) to prevent uncontrolled system shutdown and a customized satellite telemetry scheme. Various implementations of the sIPR were deployed on the Kaskawulsh Glacier near an ice-marginal lake in Yukon, Canada, for 44–77 days in summers 2014, 2015 and 2017. Pronounced perturbations to englacial radiostratigraphy were observed commensurate with lake filling and drainage, and are interpreted as changes in englacial water storage. Another sIPR was deployed in 2015–2016 on ice island PII-A-1-f, which originated from the Petermann Glacier in northwest Greenland. This system operated autonomously for almost a year during which changes in thickness of the ice column were clearly detected.Publisher PDFPeer reviewe