Breathing Limited Air Situational Training Masks (BlastMask) Versus Self-Contained Breathing Apparatus (SCBA) for Firefighters: A Pilot Study

International Journal of Exercise Science 12(6): 941-949, 2019. Despite maintaining high levels of fitness, firefighters’ performance may be negatively impacted by the use of a Self-Contained Breathing Apparatus (SCBA), an essential piece of safety equipment worn during structural firefighting. Routine training with SCBAs can be cost-prohibitive and inefficient. The Breathing Limited Air Situational Training Mask (BlastMask) was developed as a training aid used to simulate the SCBA. The purpose of this study was to examine physiological and perceptual responses elicited by firefighters during steady state exercise when using the BlastMask compared to the SCBA. Current staff male firefighters (n = 10; mean age = 29.5 ± 7.7; mean BMI = 26.9 ± 2.7) performed two separate 10-minute steady state treadmill exercise sessions: one using an SCBA and one using a BlastMask. Paired-samples t-tests were conducted to determine differences between mean heart rate (HR), mean pulse oximetry, post-exercise perceived stress, rate of perceived exertion of the session (S-RPE-), and for each minute of breathing (B-RPE) across the two trials. There were no significant differences between SCBA and BlastMask for HR (p = .07), pulse oximetry (p = .67), S-RPE (p = .08), or post-exercise perceived stress (p = .32); though firefighters reported greater B-RPE (p \u3c .001) when using the BlastMask. Mean HR was strongly correlated between both sessions (r = .89). Based on these initial findings, the use of the BlastMask appears to elicit similar physiological and perceptual responses during steady state exercise when compared to the SCBA. The BlastMask may therefore be an appropriate supplemental, cost-effective training aid for firefighters, though more research is recommended

Is Fitspiration Truly an Inspiration? Relationships between Fitspiration, Exercise, and Body Image

Young adults across the United States struggle to meet physical activity recommendations and consume healthy diets, and they often suffer from issues related to body image. Social media influencers dedicated to fitspiration (i.e., fitness inspiration) are purported to have a goal of inspiring others to lead healthier lifestyles. The purpose of this study was to explore the relationships between fitspiration and exercise and body image perceptions amongst college students. Participants (n = 361, mean age = 20.2 years, 78% female) completed surveys that included sociodemographic information, social media usage, fitspiration content engagement, exercise, and body satisfaction. An independent samples t-test assessed differences in exercise by fitspiration viewership, and a chi-square analysis determined relationships between fitspiration and body satisfaction. Participants were routinely active on social media (91% use it for \u3e 1 hour per day), and 61.5% were exposed to fitspiration content. Approximately 41% of respondents have followed exercise advice from fitspiration influencers, though only 11% reported having purchased products. No relationships were reported between following fitspiration and days per week of exercise (M∆ = .02(.20), p = .91). Participants that followed fitspiration were more likely to be dissatisfied with their bodies, X2 (1, n = 316) =7.77, p = .005, compared to participants who did not. Findings demonstrate fitspiration was not related to exercise and was related to poorer body image perceptions among college students. These results are supported by previous findings and indicate a critical misalignment between the purported purpose of fitspiration and the outcome of its viewing

Body Composition Estimation and Satisfaction in College Students

College students are at an elevated risk for engaging in unhealthy lifestyle behaviors, including disordered eating and low levels of exercise. Evidence also suggests that college students inaccurately estimate their weight status (e.g., reporting they are overweight when they are at a normal weight) and report high levels of body dissatisfaction. Efforts to promote healthy behavior change and body satisfaction first require an accurate perception of the problem. The purpose of this study was to 1) determine the accuracy with which college students estimate their weight and body composition, and 2) better understand the relationship between body composition and body satisfaction. Methods: Forty-five college students (males = 21 and females = 24), between 18 and 30 years of age, completed a survey with items assessing demographic characteristics, weight status estimation, body composition estimation, and the Body Part Satisfaction Scale (BPSS). Body composition was assessed using Dual x-ray absorptiometry (DXA). Paired samples t-tests were used to compare means between participant’s objective measurements and their estimated measurements. Bivariate analyses were used to determine relationships between body part dissatisfaction and body composition. Results: Males and females accurately estimated their weight (d =-.16, SD = 2.56, t(44) = -.414, p = 0.68), but significantly underestimated their body fat percentage (d =-4.37, SD = 7.62, t(44) = -3.85), p = 0.001). Greater body dissatisfaction was associated with a higher body fat percentage (r =. 353), but not body fat percentage estimation (r = .164). In the trunk region, a higher body fat percentage in that region was significantly associated with greater dissatisfaction for abdomen size (r = .323); higher body fat percentage in the arms and legs were mildly associated with greater dissatisfaction in the respective areas (r = .268; r = .260), though not statistically significant. Conclusions: Although college students accurately estimated their weight, they significantly underestimated their fat mass, indicating a misunderstanding regarding the proportion of their body weight composed of fat tissue. As expected, greater fat mass in specific body parts (e.g., arms, legs, and truck) was related with greater dissatisfaction in those specific areas. Future research should continue to investigate these relationships and body composition estimation accuracy in more diverse samples. Health promotion initiatives should aim to educate students on body composition and continue to promote healthy behavior change along with body satisfaction

Physical and social environmental characteristics of physical activity for Mexican-origin children: examining differences between school year and summer perceptions

BACKGROUND: Colonias are substandard residential areas along the U.S.-Mexico border. Families of Mexican-origin living in colonias face health burdens characterized by environmental and socioeconomic hardships. Mexican Americans and low-income families, including colonias children, do not frequently participate in physical activity despite the known link to disease risk reduction. For colonias children, schools are the most commonly reported location for physical activity. School closures and extreme temperatures during summer months create a need to explore seasonal differences in environmental supports and barriers in this population. The purpose of this study was to examine the effect of seasonality on perceived environmental barriers, opportunities, and social support for physical activity among colonias children. As a secondary aim, mother-child discordance for each factor was analyzed. METHODS: Promotora-researchers recruited mother-child dyads (n=101 dyads, n=202 participants) from colonias in Hidalgo County, Texas. Mothers and children were separately administered surveys at two time points to capture perceived barriers, opportunities, and social support for physical activity (school-year: February-May; summertime: July-August). Summative scores for each outcome were calculated and three multilevel longitudinal models for continuous outcomes were examined; children were nested within households. Mother-child discordance was measured using Cohen’s Kappa statistic. RESULTS: Physical activity barriers and environmental opportunities (household and neighborhood) increased from school-year to summer by 1.16 and 2.83 points respectively (p≤0.01), after adjusting for covariates. Significant predictors of increased barriers included household income of >$900/month and having more household members. Children of mothers with significant others who were employed part-time or full-time saw significant decreases in barriers. Mother-child agreement of barriers, environmental opportunities, and social support across seasons was slight to fair (range: median κ=0.047 to κ=0.262). CONCLUSIONS: These results suggest a complex relationship between dimensions of economic hardship (employment status, household income, etc…) and perceived opportunities and barriers of children’s physical activity engagement during the school-year and summer. In this study, both barriers and opportunities increased from school-year to summer, further demonstrating that interactions among these characteristics need to be better understood and addressed when considering physical activity initiatives for colonias and other Mexican-American children, specifically during summer when school-based physical activity resources are unavailable

Applying the Theory of Planned Behavior to Sedentariness and Stress

Objective: The purpose of this study was to evaluate the predictive value of the theory of planned behavior (TPB) in the sedentary behavior (SB) of young and middle-aged U.S. adults. Relationships between SB over a six-week period were examined using socio-demographic characteristics, TPB constructs, and a stress variable. Methods: Participants (n=45, mean age=31 years, 70% female, 83% White) completed surveys that included sociodemographic information, TPB constructs, and the Weekly Stress Inventory. Participants wore an activity monitor for six weeks and completed the stress inventory once weekly over the study period. A longitudinal model was estimated to determine the relationship between TPB constructs, socio-demographic characteristics, and stress level with SB across the six weeks. Results: Activity monitors revealed participants were sedentary for approximately 11 waking hours per day (SD=1.4). Bivariate analyses indicated a small effect between subjective norms and SB. Model fit indices modestly supported TPB constructs in explaining SB (i.e., a 2.3% reduction in person-level error variance); and a modest relationship between greater stress and less SB (i.e., additional 1.4% reduction in person-level error variance). Conclusions: Results cautiously support continued exploration of the TPB in SB research. Like most behaviors, the TPB alone may not fully explain SB. Future research should continue to explore theoretical determinants of SB, expand to include other theoretical models; and include diverse populations. More research is needed to understand the relationship between SB and stress. Practitioners are encouraged to consider both SB and stress in holistic efforts to improve the health of adults

Associations of Objectively Measured Light-Intensity Activity on Metabolic Risk Factors in Female Adults

Metabolic syndrome (MetSy) has been defined as a collection of metabolic irregularities that increase the risk of cardiovascular disease, type 2 diabetes, and all-cause mortality. Women are at an even greater risk for developing MetSy when compared to men with prevalence increasing with age. Moderate to vigorous physical activity (MVPA) has shown consistent association with decreases in risk of MetSy; however, light physical activity (LPA) has been studied less often in comparison. PURPOSE: The purpose of this study was to examine relationships between accelerometer-determined LPA and MetSy risk factors (waist circumference (WC), glucose, high density lipoprotein (HDL), triglycerides, systolic blood pressure (SBP), and diastolic blood pressure (DPB)) across women of different age groups. METHODS: A cross-sectional study design was used to examine 68 female participants, ages 20-65, employed in sedentary careers working in an urban area in the south central United States. Venous blood samples were taken from the antecubital area of the arm from all participants who had fasted at least eight hours prior to their scheduled appointment times. Physical activity data was collected for seven days via hip-worn accelerometers with LPA being measured based on Freedson cut-points (100-1951 counts per minute). MetSy was diagnosed based on the criteria set forth by the National Cholesterol Education Program in 2002. Data were analyzed using regression analysis with SPSS version 20.0. Between-subject analysis was conducted for four age groups (group1=20-35; group2=36-45; group3=46-55; group4=55 and older) using LPA, WC, glucose, HDL, triglycerides, SBP, and DPB. RESULTS: Between-subject regression analysis showed HDL as a significant MetSy risk factor in a full model (p=0.02) and a model with age groups as the only independent variable (p=0.00). Post-hoc Tukey tests showed significance differences in HDL among groups 4 and 2 (confidence interval (CI): 4.03, 35.92; p=0.00), and groups 4 and 3 (CI: 6.06, 39.63; p=0.00). Significance dropped below the apriori level of 0.05 in a model based on LPA. Post-hoc Tukey tests revealed non-significant (α\u3e0.05) associations between LPA levels (high, medium, low) and all MetSy values. CONCLUSION: The relationship between LPA and MetSy risk factors has been studied less frequently than MVPA in relation to MetSy risk factors. Based on these findings LPA is not significantly related with these risk factors. Future studies should continue to explore the relationship between LPA and MetSy risk factors among both men and woman, and in different settings

Physical Activity-Related Policy and Environmental Strategies to Prevent Obesity in Rural Communities: A Systematic Review of the Literature, 2002-2013

Citation: Meyer, M. R. U., Perry, C. K., Sumrall, J. C., Patterson, M. S., Walsh, S. M., Clendennen, S. C., . . . Valko, C. (2016). Physical Activity-Related Policy and Environmental Strategies to Prevent Obesity in Rural Communities: A Systematic Review of the Literature, 2002-2013. Preventing Chronic Disease, 13, 24. doi:10.5888/pcd13.150406Additional Authors: Valko, C.Introduction Health disparities exist between rural and urban residents; in particular, rural residents have higher rates of chronic diseases and obesity. Evidence supports the effectiveness of policy and environmental strategies to prevent obesity and promote health equity. In 2009, the Centers for Disease Control and Prevention recommended 24 policy and environmental strategies for use by local communities: the Common Community Measures for Obesity Prevention (COCOMO); 12 strategies focus on physical activity. This review was conducted to synthesize evidence on the implementation, relevance, and effectiveness of physical activity-related policy and environmental strategies for obesity prevention in rural communities. Methods A literature search was conducted in PubMed, PsycINFO, Web of Science, CINHAL, and PAIS databases for articles published from 2002 through May 2013 that reported findings from physical activity-related policy or environmental interventions conducted in the United States or Canada. Each article was extracted independently by 2 researchers. Results Of 2,002 articles, 30 articles representing 26 distinct studies met inclusion criteria. Schools were the most common setting (n = 18 studies). COCOMO strategies were applied in rural communities in 22 studies; the 2 most common COCOMO strategies were "enhance infrastructure supporting walking" (n = 11) and " increase opportunities for extracurricular physical activity" (n = 9). Most studies (n = 21) applied at least one of 8 non-COCOMO strategies; the most common was increasing physical activity opportunities at school outside of physical education (n = 8). Only 14 studies measured or reported physical activity outcomes (10 studies solely used self-report); 10 reported positive changes. Conclusion Seven of the 12 COCOMO physical activity-related strategies were successfully implemented in 2 or more studies, suggesting that these 7 strategies are relevant in rural communities and the other 5 might be less applicable in rural communities. Further research using robust study designs and measurement is needed to better ascertain implementation success and effectiveness of COCOMO and non-COCOMO strategies in rural communities

DE-STARLITE: A Directed Energy Planetary Defense Mission

This paper presents the motivation behind and design of a directed energy planetary defense system that utilizes laser ablation of an asteroid to impart a deflecting force on the target. The proposed system is called DE-STARLITE for Directed Energy System for Targeting of Asteroids and ExploRation – LITE as it is a small, stand-on unit of a larger standoff DE-STAR system. Pursuant to the stand-on design, ion engines will propel the spacecraft from low-Earth orbit (LEO) to the near-Earth asteroid (NEA). During laser ablation, the asteroid itself becomes the propellant ; thus a very modest spacecraft can deflect an asteroid much larger than would be possible with a system of similar mission mass using ion beam deflection (IBD) or a gravity tractor. DE-STARLITE is capable of deflecting an Apophis-class (325 m diameter) asteroid with a 15-year targeting time. The mission fits within the rough mission parameters of the Asteroid Redirect Mission (ARM) program in terms of mass and size and has much greater capability for planetary defense than current proposals and is readily scalable to the threat. It can deflect all known threats with sufficient warning

Physical activity, sedentary behavior, and perceived stress among adults : an application of the theory of planned behavior.

Background: Young and middle-aged adults engage in low levels of physical activity, high levels of sedentary behavior, and experience high levels of stress. Examining physical activity and sedentary behavior through the theory of planned behavior framework may provide useful insight to help address health issues in the population. The objective of this study was to evaluate the predictive value of the theory of planned behavior in explaining physical activity and sedentary behavior in young and middle-aged U.S. adults. Specifically, relationships between objectively measured physical activity and sedentary behavior over a 6-week period were examined using socio-demographic characteristics and theory of planned behavior constructs. A secondary objective was to measure stress dynamically and examine the relationship between stress and physical activity, and stress and sedentary behavior, over the same 6-week period. Methods: Participants (n=45, mean age=31 years, 70% female, 83% White) completed surveys that included sociodemographic information, theory of planned behavior constructs, and a weekly stress inventory. Participants also wore an activity monitor (i.e., Actigraph accelerometer or SenseWear Armband) for 6 weeks and completed the weekly stress inventory once weekly throughout the 6-week study period. Two longitudinal models were estimated to determine the relationship between TPB constructs, relevant socio-demographic characteristics, and perceived stress with sedentary behavior and physical activity over the 6-week study period. Results: Model fit indices supported the theory of planned behavior constructs in explaining physical activity and sedentary behavior. Model fit indices also supported a relationship between greater stress and less time spent being sedentary, but did not support a relationship between physical activity and stress in this sample. Conclusions: Results cautiously continue to support the use of the theory of planned behavior to explain physical activity and sedentary behaviors, though the constructs in this study explained less variance in intention and behavior when compared to previous research. More research should be conducted to understand the relationships between stress and physical activity, and stress and sedentary behavior. Researchers and practitioners should address physical activity, sedentariness, and stress in efforts to improve the health status of young and middle-aged adults

Physiological and Perceptual Response to a Live Collegiate Esports Tournament

International Journal of Exercise Science 13(6): 1418-1429, 2020. Competitive esports has grown rapidly across the globe justifying a need to quantify the physiological stress response to this environment. The purpose of this study was to describe the physiological and perceptual responses in a live collegiate esports tournament. Male members of the University of Mississippi Esports team (n = 14; age = 19.8 ± 1.0 years; BMI = 24.1 ± 5.5) completed the study during the esports Egg Bowl. Heart rate (HR) and heart rate variability (HrV) were collected pre-, during, and post-competition. Rating of perceived exertion for the session (S-RPE) and mental fatigue were collected post competition. Mean HR during competition were significantly elevated compared to mean pre- and post- (131.4 ± 19.0 bpm vs. 97.1 ± 19.9 bpm and 101.9 ± 17.4 bpm; p = 0.000) and peak HR during competition were significantly elevated compared to peak pre- and post-(188.1 ± 32.9 bpm vs. 119.6 ± 20.1 bpm and 119.9 ± 16.3 bpm; p = 0.000). R-R intervals were significantly lower in-competition (465.71 ± 68.99) compared to pre- (643.64 ± 138.54) or post- competition (616.07 ± 109.98; p = .000). No significant differences were found in rMSSD, (ln) rMSSD, SDNN, or NN50 across the three measurements. LF was lower post- competition than pre-competition (d = 0.278). Participants indicated moderate mental fatigue (3.7 ± 1.2; on a scale of 1-7). These findings demonstrate competing in esports causes a physiological stress response. Given the elevated HR, further understanding of the chronic physiological stress to competitive esports is warranted