The purpose of this study was to examine the impact of an after school physical activity intervention on adolescents with visual impairments within the context of Social Cognitive Theory. Four adolescents with visual impairments (1 female, 3 males) between 14 and 19 years of age from a residential school for the blind served as participants. We used a range-bound changing criterion single-subject design. Physical activity was measured using ActiGraph accelerometers. Questionnaires were used to obtain information on selected social cognitive theory constructs. Results show that the intervention exerted functional control over the target behaviors (e.g., leisure-time physical activity) during intervention phases. Similarly, changes in scores for selected social cognitive constructs, in particular for outcome expectancy value, suggest a positive relationship between those constructs and physical activity behavior. No maintenance effects were observed.
Carlos M. Cervantes and David L. Porretta
Kirsten Krahnstoever Davison
A comprehensive measure of activity-related support was developed and used to examine gender differences in activity support and links between support and physical activity in a sample of adolescents.
Participants included 202 middle school girls and boys. Participants completed the Activity Support Scale and three self-report measures of physical activity.
Seven sources of support were identified including maternal and paternal logistic support, maternal and paternal modelling, general familial support, sibling support, and peer support; all scales were internally consistent. No gender differences in activity-related support were identified. Adolescents who were more active reported higher levels of activity support from all sources except maternal and paternal modelling of physical activity.
Results from this study highlight the importance of activity-related support from family and friends as a potential method to promote and sustain physical activity among adolescents.
Alan L. Smith
This study tested a model describing the relationships among perceptions of peer relationships, physical self-worth, affective responses toward physical activity, and physical activity motivation. The model was grounded in Harter’s (1978,1981a, 1986,1987) theoretical perspective, proposing that perceptions of peer relationships (i.e., friendship, peer acceptance) would predict physical activity motivation via affect and physical self-worth. Adolescents (N = 418, ages 12–15 years) completed a battery of questionnaires that assessed the study variables. Results of structural equation modeling analyses supported the overall model and most of the hypothesized direct and indirect relationships among variables for both female and male samples. Examination of alternative models suggested that some expected relationships might have been suppressed by a high correlation between the friendship and peer-acceptance constructs. However, alternative models also showed that these constructs independently contribute to predicting motivational variables. The results illustrate the importance of peer relationships to adolescent physical activity motivation.
Katrina D. DuBose and Andrew J. McKune
The relationship between physical activity levels, salivary cortisol, and the metabolic syndrome (MetSyn) score was examined. Twenty-three girls (8.4 ± 0.9 years) had a fasting blood draw, waist circumference and blood pressure measured, and wore an ActiGraph accelerometer for 5 days. Saliva samples were collected to measure cortisol levels. Previously established cut points estimated the minutes spent in moderate, vigorous, and moderate-to-vigorous physical activity. A continuous MetSyn score was created from blood pressure, waist circumference, high-density-lipoprotein (HDL), triglyceride, and glucose values. Correlation analyses examined associations between physical activity, cortisol, the MetSyn score, and its related components. Regression analysis examined the relationship between cortisol, the MetSyn score, and its related components adjusting for physical activity, percent body fat, and sexual maturity. Vigorous physical activity was positively related with 30 min post waking cortisol values. The MetSyn score was not related with cortisol values after controlling for confounders. In contrast, HDL was negatively related with 30 min post waking cortisol. Triglyceride was positively related with 30 min post waking cortisol and area under the curve. The MetSyn score and many of its components were not related to cortisol salivary levels even after adjusting for physical activity, body fat percentage, and sexual maturity.
Kristin M. Mills, Anita L. Stewart, Barbara Y. McLellan, Carol J. Verboncoeur, Abby C. King and Byron W. Brown
Health-promotion programs’ success depends on their ability to enroll representative samples of the target population, particularly those who are hard to reach and those who can benefit the most from such programs. This article evaluates enrollment bias in the recruitment process, examines the usefulness of a 2-phased recruitment strategy in enrolling representative proportions of eligible individuals in a physical-activity-promotion program for older adults, and explores predictors of enrollment. Of 1,381 randomly selected Medicare HMO members. 519 were eligible. Of these, 54% attended an informational meeting and 33% enrolled in the program. Relative to the target population, a representative proportion of women was enrolled, but those who enrolled were slightly younger. Of those who were eligible, a representative proportion of sedentary participants was recruited, those who were overweight were overrep-resented, and the oldest old, less educated, ethnic minorities, and precontem-plators of physical activity were underrepresented. Modifiable predictors of enrollment included interest in health, previous health-class attendance, and having had a physician recommend exercise.
Natalie Colabianchi, Jamie L. Griffin, Kerry L. McIver, Marsha Dowda and Russell R. Pate
Numerous studies have focused on the role of environments in promoting physical activity, but few studies have examined the specific locations where children are active and whether being active in these locations is associated with physical activity levels over time.
Self-reported locations of where physical activity occurred and physical activity measured via accelerometry were obtained for a cohort of 520 children in 5th and 6th grades. Latent class analysis was used to generate classes of children defined by the variety of locations where they were active (ie, home, school grounds, gyms, recreational centers, parks or playgrounds, neighborhood, and church). Latent transition analyses were used to characterize how these latent classes change over time and to determine whether the latent transitions were associated with changes in physical activity levels.
Two latent classes were identified at baseline with the majority of children in the class labeled as ‘limited variety.’ Most children maintained their latent status over time. Physical activity levels declined for all groups, but significantly less so for children who maintained their membership in the ‘greater variety’ latent status.
Supporting and encouraging physical activity in a variety of locations may improve physical activity levels in children.
Phillip Post and Rebecca Palacios
Approximately three quarters of the children between 6 and 17 years of age are not meeting the recommended physical activity requirements of 60 min of moderate to vigorous physical activity (MVPA) per day ( Child & Adolescent Health Measurement Initiative, 2016 ). These low physical activity rates
Yuki Kondo, Ryuichi Sawa, Aoi Ebina, Masayo Takada, Hiromi Fujii, Yoko Okuyama, Yuko Tanikawa, Kaoru Souke and Rei Ono
Physical activity during pregnancy has numerous benefits, but the influence on the duration of labor is unclear. We investigated the influence of habitual physical activity during late pregnancy on the duration of labor, with consideration of previous delivery experience and the stage of labor.
This prospective study included 103 women (48 nulliparous, 55 multiparous) in late pregnancy. Habitual physical activity was evaluated using the Baecke physical activity questionnaire (BQ). Women were divided into a high activity group (HA) and a low activity group (LA) based on their median total BQ score. Data pertaining to the duration of labor were obtained from the birth records after delivery.
In multiparous women, the duration of the second stage of labor was significantly shorter in the HA group than in the LA group [median (range): HA, 11 min (1–102 min); LA, 20 min (4–175 min); P < .05]. The significant difference persisted after adjusting for confounding variables (standardized β = –0.34; P = .01). In nulliparous women, there were no significant differences in duration of labor between groups.
Higher physical activity in multiparous women during late pregnancy might positively influence the duration of the second stage of labor.
Maria Hagstromer, Barbara E. Ainsworth, Pekka Oja and Michael Sjostrom
The aim of this study was to compare physical activity components in the long, self-administrated version of IPAQ with an accelerometer in a population sample.
In total 980 subjects (18-65 years) wore an accelerometer (Actigraph) for 7 consecutive days and thereafter filled in the IPAQ. Measures of total physical activity, time spent in moderate and in vigorous activity as well as time spent sitting as assessed by the IPAQ and the Actigraph were compared.
The results showed significant low to moderate correlations (Rs = 0.07−0.36) between the 2 instruments and significantly (P < .001) higher values for sitting and vigorous intensity physical activity from the IPAQ compared with the Actigraph. The higher the values reported by the IPAQ the bigger differences were seen between the instruments. Comparison between the tertiles of total physical activity by the 2 instruments showed significant overall association with consistent agreement in the low and the high tertiles.
The long form of IPAQ is a valid measure of physical activity in population research. However, the IPAQ likely overestimates actual physical activity as shown by its limited ability to classify adults into low and high categories of physical activity based on accelerometer data.
Jorge Mota, Nuno Delgado, Mariana Almeida, José Carlos Ribeiro and Maria Paula Santos
The purpose of this study was 1) to compare physical activity levels according to body-mass index; 2) to determine which, if any, neighborhood perceived attributes were related to overweight.
The sample comprised 610 girls age 14.7 ± 1.6 y. Girls were grouped into normal weight and overweight. Environmental variables and physical activity were assessed by questionnaire.
No significant differences were found in physical activity levels between normal weight and overweight girls. Logistic regression analysis revealed that girls who agreed that “there is so much traffic on the streets that it makes it unpleasant to walk in the neighborhood” were more likely to be overweight (OR = 1.78; 95% CI 1.10 to 2.89).
The study found no relationship between perceptions of the environment and overweight among Portuguese girls, except for perceptions of security for walking in the neighborhood.