Correlates of Meeting the Muscle-Strengthening Exercise Guidelines in Children and Adolescent

Determinants of engagement in muscle-strengthening activities among children and adolescents: insights from a large-scale school-based study

Objectives

This study examined the sociodemographic factors associated with muscle-strengthening exercise (MSE) participation in a sample of Chinese school-aged children.

Methods

A cross-sectional survey was conducted in March 2021, comprising 67,281 students from public schools in Shenzhen through a multistage sampling method. The survey collected data on MSE participation, sociodemographics, family and educational information, and other aspects. A three-level mixed multilevel effect model was performed to analyze the associations between the selected sociodemographic characteristics and MSE participation. Results were presented using odd ratios (OR) with 95% confidence intervals (CI).

Results

38.6% of participants met the MSE guidelines. In models of adherence to MSE guidelines and MSE days, boys were more likely to participate in MSE (OR = 1.31, 95%CI: 1.27-1.36, p < 0.001) than girls. Compared to primary school students, junior middle school students (OR = 1.60, 95%CI: 1.47-1.74, p < 0.001) were more likely to participate in MSE, whereas high school students (OR = 0.61, 95%CI: 0.51-0.73, p < 0.001) participated less frequently. Socioeconomic status (both OR = 1.07, 95%CI: 1.01-1.13, p < 0.001) was positively associated with MSE participation. Participants who perceived their weight as "about the right weight" or "slightly overweight" were most likely to participate in MSE. Weight satisfaction was negatively associated with guideline adherence, with those "very dissatisfied" with their weight being more likely to adhere. Positive associations between sports club participation and sports equipment satisfaction with MSE participation were also found. Other factors, such as ethnicity and parental education level, showed no significant association.

Conclusion

MSE participation is correlated by sociodemographic, behavioral, and self-perception factors, particularly sex, age, socioeconomic status, sports club involvement, and weight perception. Interventions to enhance MSE participation should target the important identified factors. Future studies should consider using longitudinal designs to strengthen understanding of MSE, further aiding in developing relevant and effective interventions.

A Trend Analysis of Adherence to the Muscle Strengthening Exercise Guidelines in US Adolescents

Objectives: This study aimed to describe the trends of the muscle-strengthening exercise (MSE) guidelines adherence in adolescents and factors associated with the adherence. Methods: Using the Youth Risk Behavioural Survey data, this study assessed the trends of adhering to the MSE guidelines in adolescents. The survey-year-based trends of MSE guidelines adherence was assessed with logistic regression. Binary logistic regression was used to identify the correlates (i.e., sex, grade, race/ethnicity) of the guidelines' adherence. Results: 73,074 study participants (female = 36,497, male = 36,108; mean age = 16.04 years) were included for analysis. An overall declining trend of the MSE guidelines in adolescents was found (55.6% in 2011 → 49.5% in 2019, p < 0.001), and similar trends were observed in both sexes. The declining trends varied by sociodemographic factors (e.g., grade). Boys and younger adolescents were more likely to adhere to the MSE guidelines. Conclusion: The declining trend of adhering to MSE guidelines in US adolescents would be a health concern in this population. Girls and older adolescents should be targeted as intervention priorities.

Exploring the self-reported physical fitness and self-rated health, mental health disorders, and body satisfaction among Chinese adolescents: A cross-sectional study

Background

Physical activity (PA) and Physical fitness (PF) have received tremendous attention in the field of physical and mental health. However, limited attention has been given to the associations of self-reported physical fitness with some health-related outcomes. Given the COVID-19 pandemic is still active in many Chinese regions, assessing health-related physical fitness (HRPF) in adolescents using field-based assessment (such as a shuttle run for cardiorespiratory fitness) is unrealistic, therefore, this study was conducted via a self-reported questionnaire.

Purpose

The present cross-sectional study was aimed at delving into the relationship between self-reported physical fitness with self-rated health, depression, anxiety, and body satisfaction in adolescents. Three thousand eight hundred and seven study participants from 12 public schools in South-eastern China were recruited and 2,407 of them provided valid data on variables that this study needed for analysis.

Materials and methods

Study participants were asked to self-report their sociodemographic factors (e.g., sex, grade, age), independence, and outcomes. Generalized linear models were used to explore the associations of self-reported physical fitness (comprising general physical fitness, cardiorespiratory fitness, muscular strength, speed and agility, and flexibility) with depression, anxiety, and body satisfaction. A total of 2,407 children and adolescents with a mean age of 13.82 (±2.1) years were included in the final study analysis.

Results

Higher self-reported levels of general physical fitness and cardiorespiratory fitness were associated with better self-rated health, and body satisfaction but with lower risks of depression and anxiety.

Conclusion

The current study offered evidence on the roles of self-reported physical fitness and health-related outcomes. To facilitate health in children and adolescents, advocating fitness education, and promotion could be a feasible approach.

Associations of muscle-strengthening exercise with overweight, obesity, and depressive symptoms in adolescents: Findings from 2019 Youth Risk Behavior Surveillance system

Background

Previous studies have focused on the opposite relation between muscle strength, obesity, and depression in adults. Moreover, the evidence has indicated that obesity and depression in adults might be significantly decreased with Muscle Strength Exercise (MSE) albeit it might be insufficient. Therefore, the current study aimed to investigate the association between MSE, adiposity, and depression among United States adolescents.

Materials and methods

This cross-sectional study used the Youth Risk Behavioral Survey (YRBS) data. In YRBS, a cluster sample was used, and the investigation was divided into three stages. The study surveyed 13,677 high school students and conducted self-reported questionnaires on sex, grade, race/ethnicity, MSE days, overweight, obesity, and depressive symptoms. The study got the nationally representative population of American students in Grade 9 to 12 (around 12–18 years).

Results

A total of 13,677 participants (female = 6,885, male = 6641) were included in the final analysis. The participants meeting the guidelines’ requirements seemed more likely to be obese than those not meeting (OR = 1.28, 95% CI = 1.06–1.55). There was no statistical significance in the relations between the MSE guidelines and overweight and depression (OR = 0.86, 95% CI = 0.73–1.01: OR = 0.94, 95% CI = 0.83–1.06). For all the participants, the prevalence of those conforming to MSE was 30.1%. One-fifth of the participants reported no MSE per week, 7.8% reported 3 days of MSE per week, and 7.7% reported 7 days.

Conclusion

The main finding of this study indicated a positive relationship between the normative MSE required in guidelines and low-level obesity. Beyond that, the evidence was insufficient to confirm the positive links between MSE and depression among American adolescents. Our study could offer evidence for future MSE interventions in adolescents.