scholarly journals Genetic Influences on Individual Differences in Exercise Behavior during Adolescence

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Niels van der Aa ◽  
Eco J. C. De Geus ◽  
Toos C. E. M. van Beijsterveldt ◽  
Dorret I. Boomsma ◽  
Meike Bartels
Keyword(s):  
Structural Equation ◽  
Leisure Time ◽  
Genetic Factors ◽  
Threshold Model ◽  
Exercise Behavior ◽  
Equation Modeling ◽  
Substantial Part ◽  
Vigorous Exercise ◽  
Exercise Frequency ◽  
Age Cohorts

The aim of this study was to investigate the degree to which genetic and environmental influences affect variation in adolescent exercise behavior. Data on regular leisure time exercise activities were analyzed in 8,355 adolescent twins, from three-age cohorts (13-14, 15-16, and 17–19 years). Exercise behavior was assessed with survey items about type of regular leisure time exercise, frequency, and duration of the activities. Participants were classified as sedentary, regular exercisers, or vigorous exercisers. The prevalence of moderate exercise behavior declined from age 13 to 19 years with a parallel increase in prevalence of sedentary behavior, whereas the prevalence of vigorous exercise behavior remained constant across age cohorts. Variation in exercise behavior was analyzed with genetic structural equation modeling employing a liability threshold model. Variation was largely accounted for by genetic factors (72% to 85% of the variance was explained by genetic factors), whereas shared environmental factors only accounted for a substantial part of the variation in girls aged 13-14 years (46%). We hypothesize that genetic effects on exercise ability may explain the high heritability of exercise behavior in this phase of life.

Psychological and Behavioral Correlates of Early Adolescents’ Physical Literacy

2021 ◽  
Vol 40 (1) ◽  
pp. 157-165
Author(s):  
Dylan O. Blain ◽  
Thomas Curran ◽  
Martyn Standage
Keyword(s):  
Physical Education ◽  
Structural Equation ◽  
Leisure Time ◽  
Early Adolescents ◽  
Well Being ◽  
Exercise Behavior ◽  
Equation Modeling ◽  
Physical Literacy ◽  
Psychological Well Being ◽  
Psychological Wellness

Purpose: Physical literacy is understood to be important for adolescents’ behavioral and psychological wellness. Yet, to date, limited empirical data exist to support such reasoning. Addressing this gap, the present study examined relationships between physical literacy and early adolescents’ physical education engagement, leisure-time exercise behavior, and psychological well-being. Methods: The physical literacy level of 187 early adolescents (Mage = 12.84, SD = 0.55, girls = 99) was measured using the Canadian Assessment for Physical Literacy. One week later, data pertaining to standardized measures of engagement in physical education, leisure-time exercise behavior, and psychological well-being were collected. Results: Structural equation modeling revealed that physical literacy was positively correlated with physical education engagement, leisure-time exercise, positive affect, and vitality, whereas it was negatively correlated with negative affect. Conclusion: The findings from this work substantiate the contention that physical literacy has manifold benefits for early adolescents’ behavioral and psychological wellness.

Withdrawn Behavior, Leisure-Time Exercise Behavior, and Screen-Time Sedentary Behavior in a Clinical Sample of Youth

2016 ◽  
Vol 10 (3) ◽  
pp. 206-221 ◽  
Author(s):  
Meghan Schreck ◽  
Robert Althoff ◽  
Meike Bartels ◽  
Eco de Geus ◽  
Jeremy Sibold ◽  
...  
Keyword(s):  
Sedentary Behavior ◽  
Screen Time ◽  
Structural Equation ◽  
Child Behavior Checklist ◽  
Leisure Time ◽  
Clinical Sample ◽  
Sports Participation ◽  
Exercise Behavior ◽  
Equation Modeling ◽  
Withdrawn Behavior

Few studies have explored the relation between withdrawn behavior (WB) and exercise and screen time. The current study used exploratory factor analysis to examine the factor structure of leisure-time exercise behavior (LTEB) and screentime sedentary behavior (STSB) in a clinical sample of youth. Structural equation modeling was employed to investigate the relations between WB and LTEB and STSB, conditional on gender. WB was assessed using the Child Behavior Checklist, and LTEB and STSB were measured using the Vermont Health Behavior Questionnaire. LTEB and STSB emerged as two separate factors. Gender moderated the structure of STSB only. For boys and girls, WB was inversely related to LTEB but not significantly related to STSB. LTEB and STSB are best represented as distinct, uncorrelated constructs. In addition, withdrawn youth may be at risk for poor health outcomes due to lower rates of LTEB. Mental health clinicians, sports psychologists, and related providers may be uniquely qualified to enhance motivation for sports participation in withdrawn youth.

Cross-Lagged Relationships among Leisure-Time Exercise and Perceived Stress in Blue-Collar Workers

2007 ◽  
Vol 29 (6) ◽  
pp. 687-705 ◽  
Author(s):  
Rafer S. Lutz ◽  
Marc R. Lochbaum ◽  
Beth Lanning ◽  
Lucinda G. Stinson ◽  
Ronda Brewer
Keyword(s):  
Perceived Stress ◽  
Structural Equation ◽  
Leisure Time ◽  
Test Session ◽  
Blue Collar ◽  
Equation Modeling ◽  
Processing Plant ◽  
Exercise Frequency ◽  
Exercise Participation ◽  
Blue Collar Workers

Blue-collar workers (N = 203) from a large food-processing plant in the south-western U.S. completed measures of perceived stress and leisure-time exercise at an initial test session in addition to a 2-month follow-up session. Mean age of the sample participants equaled 43.61 (SD = 9.79), and 69.5% of the sample were male, 71.4% were Caucasian, and 74.9% were married/cohabitating. Structural equation modeling was employed to examine the cross-lagged relationships between perceived stress and leisure-time exercise at these time points, controlling for gender, marital status, age, and yearly household income. Results indicated that a model with a path from perceptions of Time 1 stress to Time 2 exercise frequency was most parsimonious and provided acceptable model ft, suggesting that perceptions of stress are related to reductions in exercise participation in this population. However, there was little support for a relationship between Time 1 exercise participation and Time 2 perceived stress.

Distribution and Heritability of Recurrent Ear Infections

1997 ◽  
Vol 106 (8) ◽  
pp. 624-632 ◽  
Author(s):  
Kari J. Kvaerner ◽  
Jennifer R. Harris ◽  
Kristian Tambs ◽  
Per Magnus
Keyword(s):  
Structural Equation ◽  
Genetic Factors ◽  
Age Of Onset ◽  
Population Based ◽  
Equation Modeling ◽  
Relative Contribution ◽  
Genes And Environment ◽  
Ear Infections ◽  
The Mean ◽  
Familial Environment

The distribution of recurrent ear infections was obtained from a population-based sample of 2,750 pairs of Norwegian twins born between 1967 and 1974. The lifetime prevalence of self-reported recurrent ear infections was 8.9%, with a significant predominance of female cases. The mean age of onset was 4.2 years, with a gradual decrease in occurrence from 2 to 7 years of age. Among monozygotic pairs, the rate of tetrachoric correlation between co-twins was almost identical in males (0.73, SE 0.08) and females (0.74, SE 0.06), but among the dizygotic pairs the correlation was clearly higher in males (0.53, SE 0.12) than in females (0.20, SE 0.12). The value in the unlike-sexed dizygotic twins (0.25, SE 0.05) was intermediate to that of the like-sexed male and female dizygotic pairs. The relative contribution of genes and environment to variability in the predisposition to develop otitis media was estimated by means of structural equation modeling. Variation in liability to ear infections was mainly explained by additive genetic and dominance factors in females, for whom heritability was estimated at 74%. The remaining 26% of the variation in liability was explained by individual environmental factors. In males, 45% of the variation could be accounted for by genetic factors, 29% by common familial environment, and the remaining 26% by individual environmental effects.

scholarly journals Variation and Heritability in Hair Diameter and Curvature in an Australian Twin Sample

2016 ◽  
Vol 19 (4) ◽  
pp. 351-358 ◽  
Author(s):  
Yvonne Y. W. Ho ◽  
Mark Brims ◽  
Dennis McNevin ◽  
Timothy D. Spector ◽  
Nicholas G. Martin ◽  
...  
Keyword(s):  
Structural Equation ◽  
Genetic Factors ◽  
Fiber Diameter ◽  
Scalp Hair ◽  
Genetic Correlations ◽  
Equation Modeling ◽  
Environmental Correlations ◽  
Sex Limitation ◽  
Objectively Measured ◽  
Hair Diameter

Hair diameter and curvature are two characteristics of human scalp hair used in forensic contexts. While previous data show that subjective categorization of hair curvature is highly heritable, the heritability of objectively measured curvature and diameter, and variability of hair characteristics within each individual have not yet been studied. The present study measured hair diameter and curvature using an optical fiber diameter analyzer in a sample of 2,332 twins and siblings. Heritability was estimated using maximum likelihood structural equation modeling. Results show sex differences in the magnitude of genetic influence for mean diameter and curvature, with the vast majority of the variance accounted for by genetic effects in males (diameter = 86%, curvature = 53%) and females (diameter = 77%, curvature = 61%). The consistency of diameter (variance within an individual) was also highly heritable, but did not show sex limitation, with 68% of the variance accounted for by genetic factors. Moderate phenotypic correlations were seen between diameter and consistency (r = 0.3) but there was little correlation between diameter and curvature (r = -0.13). A bivariate Cholesky analysis was used to estimate the genetic and environmental correlations between hair diameter and consistency, yielding genetic correlations of rgF = 0.27 for females and rgM = 0.25 for males.

Exploring Self-Perceptions and Social Influences as Correlates of Adolescent Leisure-Time Physical Activity

2008 ◽  
Vol 30 (1) ◽  
pp. 3-22 ◽  
Author(s):  
Catherine M. Sabiston ◽  
Peter R.E. Crocker
Keyword(s):  
Physical Activity ◽  
Indirect Effects ◽  
Structural Equation ◽  
Leisure Time ◽  
Leisure Time Physical Activity ◽  
Social Influences ◽  
Equation Modeling ◽  
Measurement Models ◽  
Self Perceptions ◽  
Ev Model

This study examined adolescent leisure-time physical activity correlates using the expectancy-value (EV) model. Adolescents (N = 857) completed questionnaires to assess competence and value self-perceptions, social influences, and physical activity. Direct and indirect effects of self-perceptions and parent and best friend influences on physical activity were explored using structural equation modeling. Measurement models were a good ft to the data and gender invariance was supported. The structural mediation model was a reasonable ft to the data, whereby the indirect effects of parents and peers and the direct effects of competence beliefs and values together accounted for 49% of the variance in physical activity. In this model, the pattern of relationships was similar for adolescent males and females. Findings supporting the EV model provide theoretical and practical implications for understanding adolescent physical activity.

scholarly journals The Indirect Effect of Trauma via Cognitive Biases and Self-Disturbances on Psychotic-Like Experiences

2021 ◽  
Vol 12 ◽  
Author(s):  
Renata Pionke-Ubych ◽  
Dorota Frydecka ◽  
Andrzej Cechnicki ◽  
Barnaby Nelson ◽  
Łukasz Gawęda
Keyword(s):  
Life Events ◽  
Indirect Effect ◽  
Structural Equation ◽  
Cognitive Biases ◽  
Equation Modeling ◽  
Clinical Samples ◽  
Substantial Part ◽  
Schizophrenia Spectrum Disorders ◽  
Traumatic Life Events ◽  
Behavioral Tasks

Although self-disturbances (SD) are considered to be a core psychopathological feature of schizophrenia spectrum disorders, there is still insufficient empirical data on the mechanisms underlying these anomalous self-experiences. The aim of the present study was to test a hypothesized model in which cognitive biases and exposure to traumatic life events are related to the frequency of SD which, in turn, contribute to the frequency of psychotic-like experiences (PLEs). Our sample consisted of 193 Polish young adults from the general population (111 females; 18–35 years of age, M = 25.36, SD = 4.69) who experience frequent PLEs. Participants were interviewed for PLEs, SD and social functioning as well as completed self-reported questionnaires and behavioral tasks that measure cognitive biases (e.g., safety behaviors, attention to threat, external attribution, jumping to conclusion, source monitoring, overperceptualization). The model was tested using path analysis with structural equation modeling. All of the hypothesized relationships were statistically significant and our model fit the data well [χ2(23) = 31.201; p = 0.118; RMSEA = 0.043 (90% CI = 0.00–0.078), CFI = 0.985, SRMR = 0.041, TLI = 0.976]. The results revealed a significant indirect effect of traumatic life events on PLEs through SD and self-reported cognitive biases. However, performance-based cognitive biases measured with three behavioral tasks were unrelated to SD and PLEs. The frequency of SD explained a substantial part (43.1%) of the variance in PLEs. Further studies with longitudinal designs and clinical samples are required to verify the predictive value of the model.

Examination of the Relationship Between Imagery Use, Efficacy Beliefs, and Body Image in Females

2014 ◽  
Vol 22 (1) ◽  
pp. 47-53
Author(s):  
Lisa Cooke ◽  
Krista Chandler
Keyword(s):  
Body Image ◽  
Structural Equation ◽  
Efficacy Beliefs ◽  
Exercise Behavior ◽  
Equation Modeling ◽  
Practical Application ◽  
Applied Model ◽  
Frequent Use ◽  
Exercise Imagery ◽  
The Relationship

Given the prevalence of inactivity among women, it is imperative to examine sources which may influence exercise behavior. Researchers have begun to examine the practical application of exercise imagery on involvement in physical activity (Giacobbi et al., 2003; Milne et al., 2008). Using the Applied Model of Imagery Use in Exercise (Munroe-Chandler & Gammage, 2005), imagery use, efficacy beliefs, and body image among female exercisers (N = 300) was investigated. Results revealed frequent use of exercise imagery, high efficacy beliefs, and positive body image cognitions among exercisers. Structural equation modeling revealed that efficacy beliefs did not mediate the relationship between imagery use and body image among a specific sample of female exercisers. However, the results do suggest that exercise imagery significantly predicts all four types of efficacy belief types (Efficacy Expectancy, Outcome Expectancy, Outcome Value, and Self-presentational Efficacy). Further examination of the suggested relationships in the applied model is needed.

Genetic and Environmental Influences on the Handedness and Footedness in Japanese Twin Children

2005 ◽  
Vol 8 (6) ◽  
pp. 649-656 ◽  
Author(s):  
Syuichi Ooki
Keyword(s):  
Environmental Factors ◽  
Secondary School ◽  
Structural Equation ◽  
Genetic Factors ◽  
Genetic Effect ◽  
Model Fit ◽  
Equation Modeling ◽  
Genetic Contribution ◽  
Japanese Education ◽  
Twin Children

AbstractThe purpose of this study was to examine the genetic contribution to handedness and footedness in childhood using one of the largest available databases of Japanese twins. The participants were 1131 twin pairs, 1057 males and 1205 females, of 11 or 12 years of age (6th grade of secondary school in the Japanese education system). All data were gathered by questionnaire. The prevalence of left (nonright) handedness was 15% in males and 13% in females. The prevalence of left (nonright) footedness was 13% in males and 11% in females. The similarities between twin pairs, estimated by concordance rates and tetrachoric correlations, suggested a slight genetic effect on male handedness, no genetic effect on female handedness, and no genetic effect on footedness in either sex. Structural equation modeling showed small genetic factors (11%) in male handedness and no genetic factors in female handedness. As to footedness, no genetic factors were observed in either sex. The effects of nonshared environmental factors were large (85%) in males and moderate (44%) in females. Moreover, handedness and footedness tended to be concordant irrespective of sex, with polychoric correlations over r = .70. The results of bivariate genetic analyses were not necessarily satisfactory. For males, no model fit. For females, shared and nonshared environmental factors explained the concordance of handedness and footedness. It was concluded that the genetic effects on handedness and footedness are relatively small, as is their association; moreover, considerably large twin samples are needed to obtain stable and appropriate results.

Genetic and environmental determination of tracking in static strength during adolescence

2005 ◽  
Vol 99 (4) ◽  
pp. 1317-1326 ◽  
Author(s):  
Maarten W. Peeters ◽  
Martine A. Thomis ◽  
Hermine H. M. Maes ◽  
Gaston P. Beunen ◽  
Ruth J. F. Loos ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Structural Equation ◽  
Genetic Factors ◽  
Peak Height ◽  
Static Strength ◽  
Height Velocity ◽  
Equation Modeling ◽  
Growth Spurt ◽  
Peak Height Velocity ◽  
Measurement Occasion

The purpose of this study was to determine whether the observed phenotypic stability in static strength during adolescence, as measured by interage correlations in arm pull, is mainly caused by genetic and/or environmental factors. Subjects were from the Leuven Longitudinal Twin Study ( n = 105 pairs, equally divided over 5 zygosity groups). Arm-pull data were aligned on age at peak height velocity to attenuate the temporal fluctuations in interage correlations caused by differences in timing of the adolescent growth spurt. Developmental genetic models were fitted using structural equation modeling. After the data were aligned on age at peak height velocity, the annual interage correlations conformed to a quasi-simplex structure over a 4-yr interval. The best-fitting models included additive genetic and unique environmental sources of variation. Additive genetic factors that already explained a significant amount of variation at previous measurement occasions explained 44.3 and 22.5% of the total variation at the last measurement occasion in boys and girls, respectively. Corresponding values for unique environmental sources of variance are 31.2 and 44.5%, respectively. In conclusion, the observed stability of static strength during adolescence is caused by both stable genetic influences and stable unique environmental influences in boys and girls. Additive genetic factors seem to be the most important source of stability in boys, whereas unique environmental factors appear to be more predominant in girls.

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