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This study examines the effectiveness of two modes of exercise on depression in adolescents with Down syndrome (DS). Thirty nine participants were randomly divided into a voluntary cycling group (VC) (i.e., self-selected cadence), an assisted cycling group (AC) (i.e., at least 30% faster than self-selected cadence accomplished by a motor),

This study examines the effectiveness of two modes of exercise on depression in adolescents with Down syndrome (DS). Thirty nine participants were randomly divided into a voluntary cycling group (VC) (i.e., self-selected cadence), an assisted cycling group (AC) (i.e., at least 30% faster than self-selected cadence accomplished by a motor), or a no exercise group (NC). In each cycling intervention the participant completed 30 minute cycling sessions, three times per week for a total of eight weeks. The Children's Depression Inventory II was administered prior to cycling (i.e., pretest) and after the eight week intervention (i.e., posttest). Although the data did not reach conventional levels of statistical significance, the results of the study demonstrated partial support for our hypothesis that adolescents with DS showed improvements in depression as measured by the Children's Depression Inventory II following assisted cycling, but not following eight weeks of voluntary cycling. In other words, eight weeks of moderate AC exercise demonstrated a trend for improved depression in adolescents with DS.
ContributorsMcgownd, Shana Leah (Author) / Ringenbach, Shannon (Thesis director) / Youngstedt, Shawn (Committee member) / Barrett, The Honors College (Contributor) / School of Nutrition and Health Promotion (Contributor)
Created2015-05
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Objectives: The goal of this study was to compare older adults (ages 60 to 80) with a fixed sleep schedule compared to a restricted sleep schedule. The purpose was to determine if reducing one's sleep by an hour each night for 12 weeks, led to worse cognition and mood over

Objectives: The goal of this study was to compare older adults (ages 60 to 80) with a fixed sleep schedule compared to a restricted sleep schedule. The purpose was to determine if reducing one's sleep by an hour each night for 12 weeks, led to worse cognition and mood over time. Study Design: The study contained two groups: older adults with their sleep restricted and older adults with their sleep un-restricted. Participants were recruited by researchers at Arizona State University and The University of Arizona by advertising in newspapers, on flyers in senior centers, and on radio stations. After rigorous screening for health conditions, current sleep patterns and depression, individuals entered the study. Participants completed the Geriatric Depression Scale after two weeks of baseline, and again after treatment week 14 of the study. Likewise, males and females performed three cognitive tests after two weeks of baseline, and again after treatment week 14 of the study. These cognitive tests included Stroop Color and Word Test, Trail making and PVT. Results: The depression scale and three cognitive tests showed that there was no significant difference with cognition and mood over 14 weeks between individuals with a fixed sleep schedule compared to a restricted sleep schedule. Conclusions: Reducing older adult's sleep duration by an hour each night for 14 weeks does not produce negative effects, and does not provoke signs of depression or weakened cognition.
Created2017-05
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Description
This study was designed with the goal of measuring the effects of sleep deprivation on muscle function. Participants in this study consisted of 19 individuals, 11 of which were in the restricted group (age 251) and 8 were in the control group (age 231). Measurements of muscle function included isometric

This study was designed with the goal of measuring the effects of sleep deprivation on muscle function. Participants in this study consisted of 19 individuals, 11 of which were in the restricted group (age 251) and 8 were in the control group (age 231). Measurements of muscle function included isometric strength, isokinetic velocity, and muscle soreness. Isometric strength and isokinetic velocity were taken for knee extension using a dynamometer. Muscle soreness was measured via a 100mm likert visual analogue scale for the step-up and step-down movements with the effected leg. Measurements were taken at baseline, and 48 hours after the damaging bout of eccentric exercise following either 8 hours of sleep per night or 3 hours of sleep per night. Results show that there were no statistical differences between groups for either measurements of isometric strength, isokinetic velocity, or muscle soreness. Due to possible confounding factors, future research needs to be conducted in order to get a better understanding of the effects of sleep deprivation on muscle function.
ContributorsSalmeron-Been, Aaron James (Author) / Dickinson, Jared (Thesis director) / Youngstedt, Shawn (Committee member) / School of Nutrition and Health Promotion (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
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Description
Dietary supplement (DS) use among adults is on the rise. This growing trend in DS use mirrors the quick and exponential growth of the fitness industry. The fitness industry focuses on the “appearance of health”, although some individuals focus on their appearance over and above their health. As a result

Dietary supplement (DS) use among adults is on the rise. This growing trend in DS use mirrors the quick and exponential growth of the fitness industry. The fitness industry focuses on the “appearance of health”, although some individuals focus on their appearance over and above their health. As a result of this focus on appearance, certain aspects of this unregulated industry promote unhealthy standards of beauty and an increase in negative body image, and influences at-risk youth to engage in dangerous practices such as extreme diet and exercise routines, or the misuse of dietary supplements. All of these factors have been linked to appearance and performance enhancing drug use, which is associated with substance use in athletes and non-athletes. This study sought to explore the role of gender as it pertained to dietary supplement use, specifically how gender differences amongst predictors of DS use (including BMI, physical activity, and body image) were associated with overall substance use in college students. The relationship between current DS use and other substance use was also examined. Students recruited from ASU fitness centers completed a survey which included questions on demographics, height and weight to calculate BMI, and several published, standardized questionnaires used to measure drug use, physical activity, body image, steroid and ephedrine use and attitudes, and dietary supplement use. There were significant gender differences in DS use as well as predictors or DS use. Controlling for demographic information, energy enhancing DS use and knowing someone who used steroids increased the likelihood an individual intended on using steroids in the future. Body image was not related to substance use in males, and physical activity mediated the relationship between DS use and substance use in males. While body image was associated with substance use in females, neither physical activity nor body image mediated the relationship between DS use and substance use in females.
ContributorsBucko, Agnes G (Author) / Vargas, Perla A (Thesis advisor) / Kassing, Jeffrey (Committee member) / Youngstedt, Shawn (Committee member) / Arizona State University (Publisher)
Created2017