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PubMed2004

An estimate of physical activity prevalence in a large population-based cohort.

PURPOSE: The purpose of this study was to describe the prevalence of self-reported moderate and vigorous physical activity (PA) among 40,261 native Californians in relation to age, gender, education, race/ethnicity, and self-reported disease risk factors. METHODS: Subjects, from the California Twin Program, completed a questionnaire that included three PA questions and were categorized by their level of PA: moderate and vigorous PA sufficient to meet CDC and ACSM guidelines. The relationship between demographic variables, chronic disease risk factors, and meeting the PA guidelines are reported. RESULTS: For moderate and vigorous PA, 22.3% and 37.4% of the total group reported meeting the guidelines respectively. Approximately one-half of all subjects met either duration or frequency criteria, but not both, for moderate and vigorous PA. Only 11.2% and 27.4% reported no moderate or vigorous PA, respectively. Significant age and education gradients existed for both moderate and vigorous PA. An inverse association was noted between both moderate and vigorous PA guidelines and prevalence of chronic disease risk factors. Both frequency and duration of PA were required to adequately characterize the association between PA and health outcomes. CONCLUSIONS: These data demonstrate 1) greater prevalence of sufficient moderate and vigorous PA and lower prevalence of sedentary behavior in this sample compared with adults nationwide, 2) a greater association between vigorous PA and improved health outcomes than was observed for moderate PA, 3) PA guidelines must focus on both frequency and duration of activity, and 4) age and education gradients in moderate and vigorous PA that could have implications for more effective targeting of guidelines to improve the PA prevalence of American adults.

Adult↗

PubMed2004

A longitudinal study of fitness and activity in girls predisposed to obesity.

PURPOSE: To determine whether physical activity and fitness change in girls with and without a predisposition to obesity from 8 to 10 yr of age. METHODS: Normal-weight girls (N = 91) were recruited at 8 yr of age according to parental body mass index (BMI): LN = girls with two lean (BMI < 25 kg.m-2) parents, LNOB = girls with one obese and one lean parent, and OB = girls with two obese (BMI > 28 kg.m-2) parents. A longitudinal study was undertaken with annual assessments at 8, 9, and 10 yr of age. The primary outcomes were fitness ([OV0312]O2peak) measured by treadmill testing, and physical activity measured by heart rate monitoring and by questionnaire. Sedentary behavior was assessed by questionnaire. RESULTS: [OV0312]O2peak (mL.kg-1.min-1) did not change over time; however, [OV0312]O2peak (L.min-1 and mL.kg-1.min-1), time on the treadmill, and treadmill stage were different across groups (P < 0.02). Girls with LNOB parents had a lower absolute [OV0312]O2 than the LN girls by 2.5 mL.kg-1.min-1 (P < 0.05). The OB group had a 3.9 mL.kg-1.min-1 lower [OV0312]O2 than the LN group (P < 0.001). The girls of LN parents also exercised longer on the treadmill (P < 0.05) than girls with OB parents. The percent of the day spent active on the weekday and weekend did not change over time or between groups. Time spent watching TV during the school year and summer was similar over the study period and between groups. CONCLUSION: Our data suggest that fitness and physical activity remain fairly constant in girls from 8 to 10 yr of age, but girls of obese parents tend to be less fit.

Body Composition↗

PubMed2004

Tracking of physical activity from childhood to adulthood.

PURPOSE: To examine 1) relationships between adult PA at 35 yr and PA as a child, and 2) the influence of enhanced primary school physical education (physed+) and of parental PA upon the long-term tracking of PA in the offspring. METHODS: PA data from the 1970-1977 Trois-Rivieres Growth and Development Study, completed when the children were aged 10-12 yr, were compared with PA data collected on 166 of the same subjects in 1996-1998, when aged 34.9 +/- 1.1 yr. The weekly duration of total PA, intense PA, light PA, organized PA, and total sedentary behaviors other than sleep as a child were each correlated with a questionnaire assessment of total weekly PA as an adult. RESULTS: Considering males and females jointly, adult PA showed a significant but weak association with childhood PA, correlations for total PA, intense PA, light organized PA, and nonorganized PA amounting to r = 0.20, 0.18, 0.12, and 0.19, respectively. In males (N = 79), the total time spent during childhood in organized PA was associated with adult PA (r = 0.26, P < 0.05), due to students who received physed+ (r = 0.34). In females, also, a higher PA frequency as an adult was significantly associated with physed+. There was no association of PA patterns between children and their parents. CONCLUSION: Our results suggest a positive impact of early required physical education upon adult PA but provide little evidence of an overall association between time spent in other categories of PA during childhood and PA as an adult.

Adult↗

PubMed2004

Improvements in physical fitness in adults with Down syndrome.

The effectiveness of an exercise training program for 52 adults with Down syndrome (M age = 39.4 years) was evaluated. The training program consisted of cardiovascular (30 minutes) and strength exercise (15 minutes) for 12 weeks, 3 days a week for 45-minutes per session. Compared to control subjects, the training group improved significantly in cardiovascular fitness and muscular strength and endurance and had a slight but significant reduction in body weight. Greater effort must be made to promote increases in physical activity participation among persons with Down syndrome and developmental disabilities in order to reduce the potential health risks associated with low fitness and sedentary behavior.

Adult↗

PubMed2001

Effects of contingent television on physical activity and television viewing in obese children.

OBJECTIVE: Elevated television (TV) viewing and physical inactivity promote obesity in children. Thus, changes in physical activity and sedentary behavior seem critical to treating childhood obesity. PRESENT STUDY: Using a randomized, 2-arm design, this pilot study tested the effects of contingent TV on physical activity and TV viewing in 10 obese children. TV viewing was contingent on pedaling a stationary cycle ergometer for experimental participants but was not contingent on pedaling for control participants. The study was conducted over 12 weeks, including a 2-week baseline period. RESULTS: Multivariate analyses indicated that the intervention significantly increased pedaling and reduced TV-viewing time. During the treatment phase, the experimental group pedaled 64.4 minutes per week on average, compared with 8.3 minutes by controls. The experimental group watched 1.6 hours of TV per week on average, compared with 21.0 hours per week on average by controls during this phase. Secondary analyses indicated that the experimental group showed significantly greater reductions in total body fat and percent leg fat. Total pedaling time during intervention correlated with greater reductions in percent body fat (r = -0.68). CONCLUSIONS: Contingencies in the home environment can be arranged to modify physical activity and TV viewing and may have a role in treating childhood obesity. Contingent TV may be one method to help achieve this goal.

Behavior Therapy↗

PubMed2006

Risk profiles for metabolic syndrome in a nonclinical sample of adolescent girls.

OBJECTIVES: The purpose of this work was to describe risk profiles for metabolic syndrome during adolescence and identify the childhood antecedents for these profiles among a nonclinical sample of non-Hispanic, white girls. METHODS: Participants were part of a longitudinal study (n = 154) and were assessed at 5, 7, 9, 11, and 13 years of age. At 13 years, girls were grouped based on values for the 6 metabolic syndrome factors (blood pressure, high-density lipoprotein, triglycerides, waist circumference, and blood glucose) using a mixture model approach. Fat mass was measured by dual-energy radiograph absorptiometry. Dietary intake was assessed by a 24-hour recall. Mothers reported family demographics and disease history. Girls' physical activity, sedentary behaviors, and fitness levels were also assessed. RESULTS: Statistical support was strongest for a 4-group solution: (1) lower metabolic syndrome risk (n = 62), (2) lower dyslipidemia risk (n = 36), (3) lower hypertension risk (n = 33), and (4) higher metabolic syndrome risk (n = 21). At 13 years, the hypertension and higher metabolic syndrome risk groups had significantly higher weight status and percentage of body fat compared with the lower metabolic syndrome and dyslipidemia risk groups. In addition, the higher metabolic syndrome and hypertension risk groups had greater increases in both BMI and fat mass across childhood. The hypertension and higher metabolic syndrome risk groups had significantly more family history of type 2 diabetes and obesity. The higher metabolic syndrome risk group consumed significantly more servings of sweetened beverages during childhood. The dyslipidemia risk group had the lowest physical activity participation during childhood, and the lower metabolic syndrome risk group had the highest fitness levels at age 13 years. CONCLUSIONS: A risk typology consisting of 4 groups was identified based on the components of metabolic syndrome. Findings on the antecedents of this risk typology suggest ways to identify those at higher risk for chronic disease and point to potential opportunities for intervention during childhood to prevent the development of metabolic syndrome.

Adolescent↗

PubMed2001

Reproduction and food habits of the lined seahorse, Hippocampus erectus (Teleostei: Syngnathidae) of Chesapeake Bay, Virginia.

The reproductive and feeding biology of the lined seahorse, Hippocampus erectus, was studied in Chesapeake Bay. Seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). Females do not play any parental care after mating. Total sex ratio and the operational sex ratio was strongly skewed toward females. Males and females had similar number of eggs/embryos and hydrated oocytes, respectively. The number of eggs/embryos found in the male brood pouch varied from 97 to 1,552 (fish from 80 to 126 mm TL), whereas the number of hydrated oocytes in female varied from 90 to 1,313 (fish from 60 to 123 mm TL). Both, the number of eggs/embryos and hydrated oocytes were better linearly correlated to total weight than to total length. The small snout and mouth size limits the feeding of the lined seahorse to small prey size. Amphypods were the predominant food items found in the guts, especially Ampithoe longimana, Gammarus mucronatus, and Caprella penantis. The lined seahorse is not abundant in Chesapeake Bay, but keeps a breeding population which is probably brought inside the bay by currents on drifting vegetation. Chances to find a partner may be difficult because of its low abundance, due to turbid waters, and its sedentary behavior.

Animals↗

PubMed2003

[The obesity epidemic and related factors: the case of Spain].

The obesity epidemic is a global phenomenon that does not respect geographic or socio-demographic boundaries. Thus, research on factors related to the obesity epidemic has focused on social and economic characteristics of modern societies. This article discusses obesity in Spain and trends in several associated factors. Together with the increase in the prevalence of obesity, important changes in the population's dietary pattern have been observed, although total energy and fat intake appear to be stable. According to several indirect indicators, sedentary behavior predominates, although the percentage of the population reporting some leisure exercise is increasing. An increase in the amount of leisure time in modern societies is suggested as an explanation for this paradox. Factors related to energy expenditure could be as important as dietary factors in the genesis of the obesity epidemic.

Adult↗

PubMed2006

Effects of job strain on blood pressure: a prospective study of male and female white-collar workers.

OBJECTIVES: We evaluated whether cumulative exposure to job strain increases blood pressure. METHODS: A prospective study of 8395 white-collar workers was initiated during 1991 to 1993. At follow-up, 7.5 years later, 84% of the participants were reassessed to estimate cumulative exposure to job strain. RESULTS: Compared with men who had never been exposed, men with cumulative exposure and those who became exposed during follow-up showed significant systolic blood pressure increments of 1.8 mm Hg (95% confidence interval [CI]=0.1, 3.5) and 1.5 mm Hg (95% CI=0.2, 2.8), respectively, and relative risks of blood pressure increases in the highest quintile group of 1.33 (95% CI = 1.01, 1.76) and 1.40 (95% CI = 1.14, 1.73). Effect magnitudes were smaller among women. Effects tended to be more pronounced among men and women with low levels of social support at work. CONCLUSIONS: Among these white-collar workers, exposure to cumulative job strain had a modest but significant effect on systolic blood pressure among men. The risk was of comparable magnitude to that observed for age and sedentary behavior. Men and women with low levels of social support at work appeared to be at higher risk for increases in blood pressure.

Adolescent↗

PubMed2004

Physical activity and television viewing in relation to risk of undiagnosed abnormal glucose metabolism in adults.

OBJECTIVE: The goal of this study was to assess the associations of physical activity time and television (TV) time with risk of "undiagnosed" abnormal glucose metabolism in Australian adults. RESEARCH DESIGN AND METHODS: This population-based cross-sectional study using a stratified cluster design involving 42 randomly selected Census Collector Districts across Australia included 8,299 adults aged 25 years or older who were free from new type 2 diabetes and self-reported ischemic disease and did not take lipid-lowering or antihypertensive drugs. Abnormal glucose metabolism (impaired fasting glycemia [IFG], impaired glucose tolerance [IGT], or new type 2 diabetes) was based on an oral glucose tolerance test. Self-reported physical activity time and TV time (previous week) were assessed using interviewer-administered questionnaires. RESULTS: After adjustment for known confounders and TV time, the odds ratio (OR) of having abnormal glucose metabolism was 0.62 (95% CI 0.41-0.96) in men and 0.71 (0.50-1.00) in women for those engaged in physical activity >or=2.5 h/week compared with those who were sedentary (0 h/week). The ORs of having abnormal glucose metabolism were 1.16 (0.79-1.70) in men and 1.49 (1.12-1.99) in women who watched TV >14 h/week compared with those who watched 14 h/week) was also associated with an increased risk of new type 2 diabetes in men and women and IGT in women compared with those watching <14 h/week. Total physical activity of >or=2.5 h/week was associated with a reduced risk of IFG, IGT, and new type 2 diabetes in both sexes; however, only the association with IGT in women was statistically significant. CONCLUSIONS: These findings suggest a protective effect of physical activity and a deleterious effect of TV time on the risk of abnormal glucose metabolism in adults. Population strategies to reduce risk of abnormal glucose metabolism should focus on reducing sedentary behaviors such as TV time, as well as increasing physical activity.

Adult↗

PubMed2004

Childhood overweight: management approaches in young children.

Management of overweight in young children may be our best opportunity for confronting the nationwide epidemic of childhood obesity. Doing so will require all health care providers to improve their identification, assessment, and guidance on this issue. As a group, we must make it a priority to obtain height and weight measurements on every child and to interpret them correctly. We must be comprehensive in our medical investigation in order to uncover identifiable causes and recognize comorbidities. Most of all, we must motivate families, as a whole, to confront this issue with us by increasing physical activity, decreasing sedentary behaviors, and improving eating practices. As health professionals in a society that is not yet poised to fight this epidemic, we must lead the way.

Behavior Therapy↗

PubMed2003

Managing cardiovascular risk reduction in elderly adults. By promoting and monitoring healthy lifestyle changes, health care providers can help older adults improve their cardiovascular health.

Primary care practitioners must explore the most effective techniques for promoting cardiovascular risk reduction in older adults. Managing lifestyle modification risk factors, such as smoking cessation, obesity, sedentary lifestyle, and nutrition is discussed in this article. Other risk factor modification efforts, often not highlighted, include managing homocysteinemia, and sedentary behavior. These factors are presented as equally important modifiable coronary heart disease risks.

Aged↗

PubMedDate not supplied

Psychosocial and demographic correlates of television viewing.

PURPOSE: The present study was grounded in the notion that previously identified physical activity determinants were associated in reverse with television viewing. Identifying demographic and psychosocial correlates and other potential determinants of television viewing may allow for the development and conceptualization of models and interventions to reduce sedentary behavior. DESIGN: Cross-sectional data from self-report measures were analyzed using multiple hierarchical regression. SETTING: Data were collected from 1995 to 1996 on seniors attending a large public university in southern California. SAMPLE: Subjects were 321 female and 255 male university seniors attending a public university in southern California. The sample's ethnic distribution was 53.8% European-American, 16.3% Latino, 16.6% Asian/Pacific Islander, 16.1% African-American, and 4.3% other. MEASURES: Typical television viewing practices on weekdays and weekends were assessed using self-report items. Physical activity determinants were assessed using self-report measures derived from social cognitive theory and the transtheoretical model of behavior change. RESULTS: The variables explaining a significant amount of variance after controlling for ethnicity and employment status in females were barriers to physical activity (p < .05), body image dissatisfaction (p < .01), and processes of change (p < .02). The entire model for females captured 16% of the variance, with the psychosocial variables accounting for 8% of the variance. The significant variables in the male model were quality of life (p < .01) and grade point average (p < .03). The full model accounted for 15% of the variance, with nondemographic variables accounting for 5% of the variance in television viewing. CONCLUSIONS: Relationships between television viewing and potential determinants were found. However, additional variables that may influence the amount of television viewing need to be conceptualized and investigated.

Adult↗

PubMedDate not supplied

A Preliminary analysis of medical expenditures among active and sedentary US adults with mental disorders.

OBJECTIVE: To determine whether leisure-time physical activity is associated with lower direct annual medical expenditures among a sample of adults with mental disorders. METHODS: Using the 1995 National Health Interview Survey and 1996 Medical Expenditure Panel Survey, differences between medical expenditures for sedentary and active persons were analyzed using t-tests. RESULTS: The per capita annual direct medical expenditure was US 2785 dollars higher for sedentary than for active persons (P<0.05). The total expenditure associated with sedentary behavior was US 31.7 billion dollars (US 19.1 billion dollars in men; US 12.6 billion dollars in women). CONCLUSIONS: Physical activity is associated with a reduced economic burden among people with mental disorders.

Adult↗

PubMed1998

The relation of physical activity to risk for symptomatic gallstone disease in men.

BACKGROUND: Gallstone disease is a major source of morbidity in the United States. Gallstones are twice as common in women as in men, but severe biliary events leading to surgery occur with equal frequency in the two sexes. OBJECTIVE: To determine whether physical activity decreases risk for symptomatic gallstone disease in men. DESIGN: Prospective cohort study. SETTING: U.S. male health professionals. PATIENTS: 45,813 men 40 to 75 years of age were followed from 1986 to 1994. MEASUREMENTS: Questionnaires mailed in 1986, 1988, 1990, 1992, and 1994 asked about physical activity, incidence of gallstone disease, age, body weight, dietary and alcohol intake, smoking habits, use of medications, and occurrence of diagnosed medical conditions other than gallstone disease. RESULTS: 828 men reported having newly symptomatic gallstones (diagnosed by ultrasonography or radiography) or undergoing cholecystectomy for recent symptoms. After adjustment for multiple confounders, increased physical activity was inversely related to risk for symptomatic gallstone disease. When extreme quintiles were compared, men younger than 65 years of age had a stronger inverse association (multivariate relative risk, 0.58 [95% CI, 0.44 to 0.78]) with risk than did men 65 years of age or older (relative risk, 0.75 [CI, 0.52 to 1.09]). In contrast, sedentary behavior was positively related to risk for symptomatic gallstone disease. Men who watched television more than 40 hours per week had a higher risk for symptomatic gallstones than men who watched less than 6 hours per week (relative risk for older men, 3.32 [CI, 1.51 to 7.27]; relative risk for younger men, 1.58 [CI, 0.38 to 6.48]). CONCLUSIONS: Physical activity may play an important role in the prevention of symptomatic gallstone disease in men even beyond its benefit for control of body weight. The results of this study indicate that 34% of cases of symptomatic gallstone disease in men could be prevented by increasing exercise to 30 minutes of endurance-type training five times per week.

Adult↗

PubMed1996

Fluoride exposure in cervids inhabiting areas adjacent to aluminum smelters in Norway. I. Residue levels.

Mandibular fluorine concentrations were determined in 1,425 red deer (Cervus elaphus), 240 moose (Alces alces), and 424 roe deer (Capreolus capreolus) collected in Norway from 1990 to 1993 in seven municipalities in which aluminum smelters are located, in eight neighboring municipalities, and in eight reference areas representing background levels. Background fluorine concentration was significantly correlated with age in all three species. Roe deer had the highest mean background fluorine level in each age group, followed by red deer. Due to differences in fluoride exposure, large variations in bone fluorine residues were evident between locations. In Ardal, the district most severely exposed to fluoride contamination, nine of ten cervids had fluorine concentrations exceeding background levels. The proportions of red deer with fluorine residues exceeding background levels also were high in neighboring municipalities to Ardal. We propose that roe deer are a better biomonitor of local fluoride exposure than red deer and moose, due to their more sedentary behavior.

Age Factors↗

PubMed2001

[Physical activity and management of obese patients].

Physical activity is recognized as an integral part of obesity treatment, in association with other therapeutic means. A major benefit of physical activity is the association with better long-term maintenance of weight loss. Physical activity has also positive psychological effects and increases quality of life. An evaluation of the usual level of physical activity and inactivity is needed for each patient. Physical activity counselling should be individualized and graded, in a perspective of individual progression. In subjects with massive obesity, remobilization based on physiotherapy techniques is the first step. All patients should be given simple advice to decrease sedentary behavior: use the stairs instead of the escalators, limit the time spent seated, etc. In general, current physical activity recommendations for the general population fit well with a majority of obese patients, i.e. a minimum of 30 minutes/day of moderate intensity physical activity (brisk walking or equivalent) on most, and preferably all, days of the week. Physical activities of higher intensities (endurance training programme) can be proposed on an individual basis. The type of physical activity required for long-term weight maintenance, and the question of adherence to physical activity recommendations in obese patients should be further investigated.

Exercise↗

PubMed2003

Porcine model of diabetic dyslipidemia: insulin and feed algorithms for mimicking diabetes mellitus in humans.

A weakness of many animal models of diabetes mellitus is the failure to use insulin therapy, which typically results in severe body wasting. Data collected from such studies must be interpreted cautiously to separate the effects of hyperglycemia from those of starvation. We provide several algorithms that were used by us in two long-term (20-week) experiments in which hyperglycemia (300 to 400 mg/dl), dyslipidemia (cholesterol [280 to 405 mg/dl] and triglycerides [55 to 106 mg/dl] concentrations), and positive energy balance were maintained in swine. Yucatan miniature swine groups included control, alloxan-induced diabetes mellitus, diabetes mellitus plus diet-induced dyslipidemia, and exercise-trained diabetic dyslipidemic pigs. The algorithms were developed for the porcine model because of several similarities to humans, including: cardiac anatomy and physiology, propensity for sedentary behavior, and metabolism of dietary carbohydrates and lipids. Acute toxic effects of alloxan (hypoglycemia, hyperglycemia, nephrotoxicosis) were minimized by preventive fluid loading and by use of algorithms in which insulin, food, and fluid therapy were administered. Long-term insulin and food maintenance algorithms elicited normal body weight gain in all three diabetic groups (lean experiment) and threefold greater body weight gain in pigs of an obesity experiment. Exercise-trained pigs of both experiments manifested significantly increased work performance and did not experience medical complications. We conclude that these algorithms can be used in swine, or similar algorithms can be developed for other animal species to maintain hyperglycemia and/or dyslipidemia, while avoiding diabetes-induced wasting. Importantly, animal models of diabetes mellitus that maintain positive energy balance and poor glycemic control provide a marked improvement over other models by more closely mimicking the human presentation of diabetes mellitus.

Algorithms↗