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Objective: To explore parents' knowledge, attitudes and behaviours regarding sugar-sweetened beverages (SSBs, e.g. soft drinks, juice drinks, sports drinks) and other beverages provided by parents at youth sports events. Design: Qualitative analysis of focus group discussions. Setting: Ada County, Idaho, USA. Method: A total of 3 focus groups were conducted with 24 parents of 6- to 11-year-old children participating in one community recreational soccer league. Parents were asked how they selected beverages for their children at soccer practices and games, and shared ideas for improving healthy beverage consumption in this setting. Two coders performed an inductive content analysis of the focus group transcripts, and an external reviewer established the trustworthiness of the data. Results: Parents expressed uncertainty about which beverages other than water were best for children's health and performance. Beverage choices were affected by factors such as cost, convenience, the weather, the level of competition and children's ages. Parents also noted the influence of coaches, other parents, their children's preferences, their beverage habits at home and the media. Parents desired evidence-based guidance on optimal beverages for youth athletes and recommended specific interventions to reduce consumption of SSBs in the context of youth sport events. Conclusion: Results indicate the need for developmentally appropriate expert recommendations for healthy beverage consumption in recreational youth sport, and reinforce findings from existing research which suggest that parents desire support to ensure healthy beverages are offered at youth sports events.

Whether caffeine (CAF) increases fat metabolism remains debatable. Using systematic review coupled with meta-analysis, our aim was to determine effects of CAF on fat metabolism and the relevant factors moderating this effect. Electronic databases PubMed, SPORTDiscus, and Web of Science were searched using the following string: CAF AND (fat OR lipid) AND (metabolism OR oxidation). A meta-analytic approach aggregated data from 94 studies examining CAF's effect on fat metabolism assessed by different biomarkers. The overall effect size (ES) was 0.39 (95% confidence interval [CI] [0.30, 0.47], p <.001), indicating a small effect of CAF to increase fat metabolism; however, ES was significantly higher (p <.001) based on blood biomarkers (e.g., free fatty acids, glycerol) (ES = 0.55, 95% CI [0.43, 0.67]) versus expired gas analysis (respiratory exchange ratio, calculated fat oxidation) (ES = 0.26, 95% CI [0.16, 0.37]), although both were greater than zero. Fat metabolism increased to a greater extent (p =.02) during rest (ES = 0.51, 95% CI [0.41, 0.62]) versus exercise (ES = 0.35, 95% CI [0.26, 0.44]) across all studies, although ES was not different for studies reporting both conditions (ES = 0.49 and 0.44, respectively). There were no subgroup differences based on participants' fitness level, sex, or CAF dosage. CAF ingestion increases fat metabolism but is more consistent with blood biomarkers versus whole-body gas exchange measures. CAF has a small effect during rest across all studies, although similar to exercise when compared within the same study. CAF dosage did not moderate this effect. [ABSTRACT FROM AUTHOR]

This study compared accuracy of energy expenditure (EE) prediction models from accelerometer data collected in structured and simulated free-living settings. Twenty-four adults (mean age 45.8 years, 50% female) performed two sessions of 11 to 21 activities, wearing four ActiGraph GT9X Link activity monitors (right hip, ankle, both wrists) and a metabolic analyzer (EE criterion). Visit 1 (V1) involved structured, 5-min activities dictated by researchers; Visit 2 (V2) allowed participants activity choice and duration (simulated free-living). EE prediction models were developed incorporating data from one setting (V1/V2; V2/V2) or both settings (V1V2/V2). The V1V2/V2 method had the lowest root mean square error (RMSE) for EE prediction (1.04-1.23 vs. 1.10-1.34 METs for V1/V2, V2/V2), and the ankle-worn accelerometer had the lowest RMSE of all accelerometers (1.04-1.18 vs. 1.17-1.34 METs for other placements). The ankle-worn accelerometer and associated EE prediction models developed using data from both structured and simulated free-living settings should be considered for optimal EE prediction accuracy.

Background. Many older individuals decline functionally during hospitalization, and the deleterious consequences of bed rest may be one cause. This study reports on the effect of 10 days of bed rest on multiple functional parameters in healthy older adults. Methods. Healthy older men and women (n = 11, 67 [+ or -] 5 years old) remained on bed rest for 10 days continuously, and consumed a eucaloric diet providing the Recommended Dietary Allowance for protein. Measures of lower extremity strength and power, aerobic capacity and physical performance, as well as physical activity were performed before and after bed rest. Results. All measures of lower extremity strength were significantly lower after bed rest including isotonic knee extensor strength (-13.2 [+ or -] 4.1%, p = .004) and stair-climbing power (-14 [+ or -] 4.1%, p = .01). Maximal aerobic capacity was 12% lower after bed rest (p = .04), whereas measures of physical performance (Short Physical Performance Battery, and a five-item physical performance test) were not significantly different. Voluntary physical activity decreased after bed rest, and the percentage of time spent inactive increased (7.6 [+ or -] 1.8%, p = .004). There were no medical complications. Conclusions. In healthy older adults, 10 days of bed rest results in a substantial loss of lower extremity strength, power, and aerobic capacity, and a reduction in physical activity, but has no effect on physical performance. Identification of interventions to maintain muscle function during hospitalization or periods of bed rest in older adults should be a high priority. Key Words: Aging--Geriatric--Bed rest--Strength Power--Aerobic capacity--Function.

Background: Thirty-five percent of the activities assigned MET values in the Compendium of Energy Expenditures for Youth were obtained from direct measurement of energy expenditure (EE). The aim of this study was to provide directly measured EE for several different activities in youth. Methods: Resting metabolic rate (RMR) of 178 youths (80 females, 98 males) was first measured. Participants then performed structured activity bouts while wearing a portable metabolic system to directly measure EE. Steady-state oxygen consumption data were used to compute activity METstandard (activity VO2/3.5) and METmeasured (activity VO2/measured RMR) for the different activities. Results: Rates of EE were measured for 70 different activities and ranged from 1.9 to 12.0 METstandard and 1.5 to 10.0 METmeasured. Conclusion: This study provides directly measured energy cost values for 70 activities in children and adolescents. It contributes empirical data to support the expansion of the Compendium of Energy Expenditures for Youth. [ABSTRACT FROM AUTHOR]

Background: It is unknown if activity monitors can detect the increased energy expenditure (EE) of wheelchair propulsion at different speeds or on different surfaces. Methods: Individuals who used manual wheelchairs (n = 14) performed 5 wheeling activities: on a level surface at 3 speeds, on a rubberized track at 1 fixed speed and on a sidewalk course at a self-selected speed. EE was measured using a portable indirect calorimetry system and estimated by an Actical (AC) worn on the wrist and a SenseWear (SW) activity monitor worn on the upper arm. Repeated- measures ANOVA was used to compare measured EE to the estimates from the standard AC prediction equation and SW using 2 different equations. Results: Repeated-measures ANOVA demonstrated a significant main effect between measured EE and estimated EE. There were no differences between the criterion method and the AC across the 5 activities. The SW overestimated EE when wheeling at 3 speeds on a level surface, and during sidewalk wheeling. The wheelchair-specific SW equation improved the EE prediction during low intensity activities, but error progressively increased during higher intensity activities. Conclusions: During manual wheelchair propulsion, the wrist-mounted AC provided valid estimates of EE, whereas the SW tended to overestimate EE. [ABSTRACT FROM AUTHOR]

Background: Increases in childhood and adolescent obesity are a growing concern in the United States (U.S.), and in most countries throughout the world. Declines in physical activity are often postulated to have contributed to the rise in obesity rates during the past 40 years. Methods: We searched for studies of trends in physical activity and sedentary behaviors of U.S. youth, using nontraditional data sources. Literature searches were conducted for active commuting, physical education, high-school sports, and outdoor play. In addition, trends in sedentary behaviors were examined. Results: Data from the Youth Risk Behavior Surveillance System (YRBSS) and other national surveys, as well as longitudinal studies in the transportation, education, electronic media, and recreation sectors showed evidence of changes in several indicators. Active commuting, high school physical education, and outdoor play (in 3- to 12-year-olds) declined over time, while sports participation in high school girls increased from 1971 to 2012. In addition, electronic entertainment and computer use increased during the first decade of the 21st century. Conclusions: Technological and societal changes have impacted the types of physical activities performed by U.S. youth. These data are helpful in understanding the factors associated with the rise in obesity, and in proposing potential solutions. [ABSTRACT FROM AUTHOR]

Research suggests that beet juice is beneficial during aerobic exercise. However, the impact of beet juice during primarily anaerobic exercise is equivocal. The purpose of this study was to determine the effects of acute beet juice supplementation on maximal intensity performance during 30-s and 60-s maximal-intensity cycling sprints. Using a double-blind, crossover-study design, 14 anaerobically trained male hockey players completed six Wingate cycling tests: familiarization trials of a 30-s and 60-s Wingate test, followed by 30-s Wingate placebo/beet juice trials, and 60-s Wingate placebo/beet juice trials. Repeated measures ANOVAs were used to compare the change in power between conditions over the duration of each trial. Paired t-tests were run to compare performance between conditions of various work and power variables. One-way ANOVAs were utilized to compare the change between conditions of the 30-s test to the change between conditions of the 60-s test. Beet juice supplementation yielded no statistical differences from placebo in any of the measured variables during the 30-s or 60-s tests (p > 0.05). The percent change for fatigue index was significantly different between the 30-s and 60-s tests (p = 0.032) suggesting less fatigue with beet juice supplementation. Overall, beet juice did not improve maximal intensity performance during 30-s or 60-s cycling sprint tests. Performance during the 60-s bout was not impacted to a greater extent than the 30-s bout after beet juice supplementation. These results suggest that beet juice supplementation does not improve short-duration exercise performance in anaerobically trained athletes. [ABSTRACT FROM AUTHOR]

Background: The indoor built environment has the potential to influence levels of physical activity. However, the extent to which architectural design in commercial buildings can influence the percentage of people choosing to use the stairs versus elevators is unknown. The purpose of this study was to determine if buildings with centrally located, accessible, and aesthetically pleasing staircases result in a greater percentage of people taking the stairs. Methods: Direct observations of stair and elevator use were conducted in 3 buildings on a university campus. One of the buildings had a bank of 4 centrally located elevators and a ire escape stairwell behind a steel door. The other 2 buildings had centrally located staircases and out-of-the-way elevators. Results: The percentage of people who ascended the stairs was 8.1% in the elevator-centric building, compared with 72.8% and 81.1% in the 2 stair-centric buildings (P < .001). In addition, the percentage of people who descended the stairs was 10.8% in the first building, compared with 89.5% and 93.7% in the stair-centric buildings (P < .001). Conclusions: The results of the current study suggest that if buildings are constructed with centrally located, accessible, and aesthetically pleasing staircases, a greater percentage of people will choose to take the stairs. [ABSTRACT FROM AUTHOR]

Objective: To explore parents' knowledge, attitudes and behaviours regarding sugar-sweetened beverages (SSBs, e.g. soft drinks, juice drinks, sports drinks) and other beverages provided by parents at youth sports events. Design: Qualitative analysis of focus group discussions. Setting: Ada County, Idaho, USA. Method: A total of 3 focus groups were conducted with 24 parents of 6- to 11-year-old children participating in one community recreational soccer league. Parents were asked how they selected beverages for their children at soccer practices and games, and shared ideas for improving healthy beverage consumption in this setting. Two coders performed an inductive content analysis of the focus group transcripts, and an external reviewer established the trustworthiness of the data. Results: Parents expressed uncertainty about which beverages other than water were best for children's health and performance. Beverage choices were affected by factors such as cost, convenience, the weather, the level of competition and children's ages. Parents also noted the influence of coaches, other parents, their children's preferences, their beverage habits at home and the media. Parents desired evidence-based guidance on optimal beverages for youth athletes and recommended specific interventions to reduce consumption of SSBs in the context of youth sport events. Conclusion: Results indicate the need for developmentally appropriate expert recommendations for healthy beverage consumption in recreational youth sport, and reinforce findings from existing research which suggest that parents desire support to ensure healthy beverages are offered at youth sports events. [ABSTRACT FROM AUTHOR]