Jane Roy

Physiological Responses of Skilled Players During a Competitive Wheelchair Tennis Match

The purpose of this study was to determine heart rate (HR, b·min−1) response during competitive match play of 6 men who were skilled wheelchair (WC) tennis players. Each participant completed an arm crank ergometer test that measured HR via a telemetry device and &OV0312;O2 via open circuit spirometry from rest until fatigue (&OV0312;O2peak). Each athlete participated in 2 competitive singles matches during which HRs were recorded in 5-second intervals and &OV0312;O2 was estimated using the corresponding HR values recorded during the arm ergometer tests. Data analysis revealed an average playing intensity of 69.4 ± 8.9% of HRpeak and 49.9 ± 14.5% of &OV0312;O2peak. In conclusion, it is recommended that skilled adult WC tennis players perform off-court aerobic conditioning as part of their training program, because the intensity of a competitive WC tennis match is sufficiently high enough to stress the cardiovascular system.

Ecological Strategies to Promote Healthy Body Image Among Children

BACKGROUND Personal habits of children and adolescents related to healthy body image (BI) are influenced by various determinants in the micro- and macroenvironment. These include attitudes and behaviors about eating; exercise and physical appearance modeled by parents, teachers, and peers; as well as opportunities to learn new habits and social praise for healthy choices. The coordinated school health program (CSHP) is compatible with the 5 levels of an ecological approach to developing new health behaviors. METHODS Authors systematically applied the ecological model to all 8 components of coordinated school health. Next, strategies for each of the components were developed using the professional literature as well as author expertise in the areas of health education, exercise science, and dietetics. RESULTS For each strategy, applicable health and physical education standards, as well as goals for each strategy and additional Web resources, were provided to assist educators and administrators in supporting healthy BI among students. CONCLUSIONS Educators may effectively use a coordinated approach to guide multiple intervention activities aimed at increasing healthy habits among adolescents and their families. The strength of the CSHP is its collaborative nature with active participation by students, faculty members, family caregivers, agency professionals, community residents, and health care providers.

The Effects of Weight Loss on Relative Bone Mineral Density in Premenopausal Women

This study compared BMD relative to body weight following a ∼6‐month weight loss program and a 1‐year weight maintenance phase in premenopausal women and determined whether African American (AA) and European‐American (EA) womens BMD respond similarly during weight loss.

Associations among body size dissatisfaction, perceived dietary control, and diet history in African American and European American women.

European American (EA) women report greater body dissatisfaction and less dietary control than do African American (AA) women. This study investigated whether ethnic differences in dieting history contributed to differences in body dissatisfaction and dietary control, or to differential changes that may occur during weight loss and regain. Eighty-nine EA and AA women underwent dual-energy X-ray absorptiometry to measure body composition and completed questionnaires to assess body dissatisfaction and dietary control before, after, and one year following, a controlled weight-loss intervention. While EA women reported a more extensive dieting history than AA women, this difference did not contribute to ethnic differences in body dissatisfaction and perceived dietary control. During weight loss, body satisfaction improved more for AA women, and during weight regain, dietary self-efficacy worsened to a greater degree for EA women. Ethnic differences in dieting history did not contribute significantly to these differential changes. Although ethnic differences in body image and dietary control are evident prior to weight loss, and some change differentially by ethnic group during weight loss and regain, differences in dieting history do not contribute significantly to ethnic differences in body image and dietary control.

Age and Gender Differences in Hip Extension and Flexion Torque Steadiness

Background: Lower extremity torque steadiness has been shown to be an independent predictor of functional performance in older women. Hip muscle function is crucial for many types of activities of daily living, yet existing studies investigating torque steadiness for lower extremities are limited to assessing steadiness at the knee and ankle. Objective: The purpose of this study was to compare age and gender differences in hip extension (HE) and flexion (HF) strength, torque steadiness, and torque accuracy (TA). Methods: Twenty young adults (10 men, 10 women; age 24.0 ± 2.2 years) and 21 older adults (11 men, 10 women; age 65.4 ± 4.5 years) matched across age for height and body mass participated. Dominant leg HE and HF isometric strength was assessed by maximal voluntary contractions (MVC); relative (5, 25 and 50% MVC) and absolute (25 Nm) torque steadiness were assessed as standard deviation and coefficient of variation of torque fluctuations, and TA was determined as the mean deviation from target torque levels. Results: MVC was lower for HF than HE (p = 0.007), but HE had greater torque fluctuations (p < 0.05). For HE, the coefficient of variation of 5% MVC was greater for older than young adults (p < 0.05) and greater for women than men (p < 0.05). For HF torque steadiness there were no age or gender differences (p > 0.05). For both HE and HF, older adults were less accurate (higher TA) than their young counterparts at 25 Nm (p < 0.022). Conclusions: Our results indicate older as compared to young adults, and women as compared to men are less steady (greater torque fluctuations) in HE at 5% MVC target torque levels, but not at higher torque levels. For HF, torque steadiness is similar across low to high target torque levels in both genders and across younger and older adults. For both HE and HF, TA is impaired in older compared to young adults at absolute target torque levels, but not at relative torque levels.

IAAT, catecholamines, and parity in African-American and European-American women.

Objective: We have recently reported that parous European‐American (EA) women have disproportionately more intra‐abdominal adipose tissue (IAAT) than their nulliparous counterparts. Mediating mechanisms for IAAT accumulation remain unknown; however, some evidence suggests a possible catecholamine link. The objective of this study was to determine whether the IAAT‐parity relationship found in EA women exists in African‐American (AA) women and to determine whether catecholamines play a mediating role.

Potentiation of concentric force and acceleration only occurs early during the stretch-shortening cycle.

Abstract McCarthy, JP, Wood, DS, Bolding, MS, Roy, JLP, and Hunter, GR. Potentiation of concentric force and acceleration only occurs early during the stretch-shortening cycle. J Strength Cond Res 26(9): 2345–2355, 2012—The purpose of this study was to determine where stretch-shortening cycle (SSC) potentiation of force, power, velocity, and acceleration occurs across the concentric phase of ballistic leg presses. Second, we examined the influence of late eccentric phase force and length of the amortization phase on potentiated concentric phase performance variables. Twenty-one male runners (age: 31.9 ± 4.7 years) performed SSC and concentric-only (CO) ballistic leg press throws. Potentiations of concentric actions were calculated as the difference between SSC and CO contractions. An analysis splitting the concentric range of motion (ROM) into 6 equal time intervals determined force and acceleration were potentiated (p < 0.05) only during the first one-sixth time interval of concentric motion, whereas velocity and power were potentiated (p < 0.05) at all time intervals over the entire concentric motion with the exception of power over the last one-sixth time interval. A more precise analysis examining 20-millisecond time intervals across the first 200 milliseconds of concentric motion determined force was potentiated only over the first 140 milliseconds and acceleration only over the first 160 milliseconds. Eccentric force measured during the last 100 milliseconds of eccentric motion was related to potentiated force during the initial 200 milliseconds of concentric motion (r = 0.44, p < 0.05) and potentiated mean power across the full concentric ROM (r = 0.62, p < 0.01). Results indicate that in contrast to power and velocity, potentiation of force and acceleration occurs only early during the concentric phase of SSC ballistic leg presses. Correlational findings imply late eccentric phase force is important for generating force and power during the concentric phase of the SSC and thus training focusing on enhancing late phase eccentric force appears important for developing explosive force and power during SSC movements.

Percent Body Fat is Related to Body-Shape Perception and Dissatisfaction in Students Attending an All Women's College

The purpose of this study was to examine the influence of aerobic fitness, physical activity, percent body fat, and socioeconomic status on body-shape perceptions among 153 Euro-American students attending an all womens college. Using a set of nine female figure silhouette drawings arranged on an ordinal scale from very thin to very heavy, subjects chose the figure that approximated their Current, Ideal, Most Attractive shapes, and the shape they believed men found the most attractive (Male Attractive). Body Shape Dissatisfaction was assessed by the difference between Current and Ideal shapes. Several significant relationships were noted for body-shape perceptions with percent body fat, aerobic fitness, and physical activity. Overall, data indicate these relationships except for Male Attractive were confounded by percent body fat, as participants with a higher percentage of body fat preferred larger shapes and were more dissatisfied with their shape.

Fear of physical response to exercise among overweight and obese adults

Regular physical activity has been shown to have significant impact on both physical and mental health; however, over half of adults in the US do not meet current recommendations for physical activity. Pain is one of the most commonly cited barriers to physical activity among adults. Fear of pain has been shown to have a significant correlation with pain-related disorders including back pain and arthritis, but no studies have examined the role that weight plays on these fears. We conducted three focus groups (n = 21) to explore the role of fear-avoidance beliefs related to exercise among a group of overweight and obese adults. Focus group members discussed their beliefs that overweight and obese adults have more exaggerated physical responses to exercises than normal weight adults. They also endorsed a belief that overweight and obese individuals interpret similar physical responses differently than normal weight individuals, and that these interpretations lead to fear that may result in exercise avoidance. Further exploration of the role of fear in exercise avoidance will be useful in designing tailored exercise prescriptions and physical activity interventions that may increase adherence among overweight and obese adults.

Responses of Health and Physical Educators to Overweight Children in Alabama

The purpose of this article is to provide an overview of the increasing problem of overweight children in Alabama including clinical definition, risk factors, and prevalence data. Health and physical educators should become familiar with guidelines released by national organizations, such as the Centers for Disease Control and Prevention, the Institute of Medicine, and state departments of education and public health. These guidelines provide direction to health promotion program activities in schools, community, and recreational settings aimed at modifying predisposing, reinforcing, and enabling factors. Four examples are presented in the narrative to illustrate collaborative partnerships among health care organizations, a health insurer, public schools, an academic research university, and state agencies to enhance youth health. The final section provides practical recommendations for professional health and physical educators regarding obesity risk reduction.