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Spending more than 3 hours a day sedentary worsens teens’ mental health

Adolescents who spend more than three hours a day engaged in sedentary behaviors – including playing video games, reading for leisure or spending a lot of time distracted by screens – have a higher risk of facing psychological distress in the future.

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Adolescents who spend more than three hours a day engaged in sedentary behaviors – including playing video games, reading for leisure or spending a lot of time distracted by screens – have a higher risk of facing psychological distress in the future, according to a study published in the Journal of Adolescent Health.

On the other hand, moderate screen exposure (between 60 and 119 minutes per day) invested in educational activities, such as doing homework or attending classes, was considered a “protective” factor associated with less psychological distress.

Sedentary behavior among adolescents has become a growing problem worldwide, with significant implications for the physical and mental health of the population in this age group. Several studies have shown that a lack of physical activity, especially when combined with excessive use of electronic devices, contributes to an increase in problems such as obesity and cardiovascular disease.

In addition, a growing body of research shows that the effects of a sedentary lifestyle are not limited to the physical body, but can also affect mental health, increasing feelings of anxiety and depression, for example.

The study, conducted at the Institute of Psychiatry, Psychology and Neuroscience at King’s College London in the United Kingdom, analyzed information from 3,675 adolescents who were part of the Millennium Cohort Study, a project that follows children born between 2000 and 2002 and maintains a large database.

The analysis included information on sedentary behavior collected at two points in time: when the adolescents were 14 years old and then at the age of 17. In the first phase, the participants completed a diary in which they recorded the different activities they performed every ten minutes. These activities were categorized into broader contexts: general physical activity, time spent sleeping, recreational screen time, non-screen recreational time, and educational sedentary behavior.

At age 17, the same participants reported their psychological distress using a six-question questionnaire about their feelings, using a tool known as the Kessler Scale. The questions included “how often in the past 30 days” did the participant feel nervous, hopeless, restless, depressed, anxious, and worthless. Analysis of the scores, based on the scale, indicated whether or not they were in psychological distress.

According to André de Oliveira Werneck, author of the article and doctoral student at the Center for Epidemiological Research in Nutrition and Health at the School of Public Health of the University of São Paulo (FSP-USP) in Brazil, the fact that the research was based on responses to sedentary behavior recorded in a diary is one of the differences that make the results so relevant.

Werneck explains that there are several ways to measure sedentary behavior. One of them, which is more objective, uses an accelerometer (a type of device that measures how much a person moves), but it cannot distinguish between different sedentary activities, which are very broad.

“Sedentary behavior includes a variety of activities, such as using a computer, watching television, reading, listening to music, or attending class. Most research focuses on analyzing total sitting time, but we can have positive sedentary activities, such as attending class and doing homework, for example. And there are activities that are not beneficial, such as spending too much time on the Internet or playing video games,” he explains.

A second method of measuring sedentary behavior is subjective, in which people answer a questionnaire about how much time they spend sedentary, watching TV, playing video games, working, or studying in a typical week. Nevertheless, it depends on the participant’s memory.

“Having a record of all the activities of these adolescents, formalized in a diary, provides a much more faithful result and has a more reliable accuracy of the different time periods. It’s not common to use this type of tool, precisely because it’s difficult to implement,” says the doctoral student, who carried out the study as part of a research internship funded by FAPESP.

Impact of reading

To analyze the data, the researchers adjusted for several covariates, including gender, parental education, net family income, parental psychological distress, body mass index, physical activity, total sedentary time and depressive symptoms.

After cross-checking the information, they found that the adolescents spent an average of four hours a day in educational sedentary behavior (school, homework) and about three hours a day in screen and non-screen sedentary behavior. Those who spent more than 180 minutes a day on screens for leisure were associated with greater psychological distress at age 17.

Similarly – and surprisingly – the researchers found that those who spent more than three hours a day reading for leisure (especially boys) also reported more psychological distress. According to the study, while previous research has shown that reading is associated with better mental health outcomes and other healthy behaviors, this new research suggests that excessive reading may be harmful in some cases.

One of the hypotheses to explain this finding, says Werneck, is that adolescents who spend many hours reading are “displacing” time that could be spent on activities with face-to-face or outdoor social interactions, which are protective, leading to greater isolation. In addition, it is possible that some of the reading is done on screen devices (cell phones, computers or tablets), which is also harmful – there are studies in adults that link screen reading to poorer sleep because of exposure to blue light.

“This is an unexpected finding in the study, but it’s important to emphasize that very few adolescents spend a lot of time reading for leisure. Our main finding, given the general context, is that more leisure screen time [video games] was associated with worse psychological distress, while more time in educational activities was associated with less distress,” he says.

Professor Brendon Stubbs, who supervised the study, told Agência FAPESP by email that the study revealed several worrying patterns. “We found that adolescents who spent more than three hours a day on screen-based leisure activities showed significantly greater psychological distress three years later. Video games were particularly influential, with each additional hour associated with a 3% increase in psychological distress.”

According to Stubbs, the results suggest a clear dose-response relationship between excessive recreational screen time and future mental health outcomes. “Importantly, this relationship was context-dependent, meaning that educational screen time did not show the same negative effects, highlighting that the problem is not screen use per se, but how and why screens are used.”

How to minimize the impact

Based on the findings, the researchers suggest interventions that could help minimize the negative psychological effects:

  • Set clear limits on screen time: Implement guidelines that limit recreational screen time to less than three hours per day, as the study results show that this is when the risks increase significantly;
  • Focus on context: Encourage more educational and structured screen activities rather than passive recreational screen time. The study found that educational screen time had no negative effects;
  • Balance activities: Promote alternative leisure activities with social interaction components, as isolated screen time can contribute to psychological distress;
  • Gender-specific approaches: Consider personalized interventions, as work has found gender differences in effects (e.g., girls were more associated with screen use for Internet browsing, boys for video games);
  • Educational support: Since moderate amounts of homework and class time have been associated with less psychological distress, ensure adequate academic engagement;
  • Manage and optimize screen time instead of eliminating it altogether.

Werneck emphasizes that sedentary behavior is very complex, and for adolescents, each activity and context needs to be evaluated separately. “We need to focus on interventions that not only reduce sedentary behavior but also reduce it in some specific and very long activities that are more associated with psychological distress,” he concludes.

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Telling people they might lose motivates more than telling them they might win, research shows

How managers choose to frame problems directly influences employees’ motivation to speak up at work. For managers, this is an insightful approach for building more open and collaborative teams.

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Athletes say they hate to lose more than they love to win. New research finds the same sentiment is shared in organizations.

A Virginia Tech researcher and his colleagues discovered that when managers frame work problems as a potential loss, employees are more likely to take action than when those problems are framed as potential gains. The research also revealed that when the potential loss impacts a larger group, employees are more likely to take action in the form of speaking up to a supervisor in hopes of finding a solution. The findings were recently published in the Journal of Applied Psychology.

For managers, this research suggests that framing work problems as potential losses can influence employees to speak up more.

“Employee voice occurs when suggestions are made to improve organizational functioning,” said Phil Thompson, associate professor in the Pamplin College of Business Department of Management. “From an organizational perspective, the positive outcomes of employee voice include improved performance, effectiveness, and workplace safety. From an employee level, speaking up is positively related to creativity, innovation, engagement, and ethical behavior.”

At its core, this research shows that how managers choose to frame problems directly influences employees’ motivation to speak up at work. For managers, this is an insightful approach for building more open and collaborative teams.

“When managers say, ‘If we don’t get this done, not only will you lose the $5,000 bonus, but everybody in this work group is going to lose a $5,000 bonus,’ it magnifies an employee’s motivation to act in a proactive way,” said Thompson. “This suggests that framing work problems as what will be collectively lost – compared to what can be individually lost – makes employees want to speak up more.”

Thompson was part of a research team led by Jeffery Thomas and Jonathan Booth from The London School of Economics and Mark Bolino from Oklahoma University. Together they analyzed responses from nearly 2,000 full-time employees, MBA students, and employee-supervisor pairs for their experience in situations where work problems were framed as either a gain or a loss. Across three different studies, framing something as a loss yielded employees to voice a work suggestion more.

For example, a manager dealing with a reputational crisis of their team, such as a product quality issue, can frame the problem in a way to spark helpful employee suggestions on how to resolve the issue. For example, instead of saying “if this product has great quality, our company will look really good” a manager saying “if this product is not up to quality standards, our reputation will be damaged” carries more weight for the team. When this reputational risk is shared by everyone, employees are more willing to step forward to help the problem.

In the first study, participants were asked to think about a problem at work that was significant for them. From there, they were randomly assigned to write about the potential losses or gains from that problem. They were also asked to indicate how likely they were to talk about these problems to their supervisor. Participants who reflected on their potential losses showed a 16 percent higher willingness to speak up compared to those who focused on the potential gains.

When it came to the MBA students, they read a fictional performance review scenario where a workplace problem was described. They then rated how willing they would be to speak up about that scenario if they were in the situation. One example suggested that the entire team might fall short of its goals if an issue was not addressed. This specific scenario yielded the most likelihood of speaking up 35 percent more than the scenario’s suggesting that only they would miss their goal, supporting the research’s findings that an employee is more likely to speak up when the loss impacts more people.

The third study looked at employee-supervisor pairings to understand how these relationships play out in the real world. Using pairings from across three industries, employees reported a workplace problem they encountered and their supervisor rated how often that employee spoke up on the job. While the first two studies involved hypothetical scenarios, this real-world evidence showed that employees were 8-10 times more likely to speak up when issues were framed as a potential collective loss compared with a potential collective gain. 

“This research is really geared toward managers so they can facilitate and understand how and why their employees will speak up,” said Thompson. “You can talk about the issue, but it always ends in terms of how we frame things.” 

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Yoga practice could reduce blood pressure in people with obesity

People who practiced yoga had a significant decrease in blood pressure, with systolic blood pressure lowered by an average of 4.35 mmHg and diastolic blood pressure by 2.06 mmHg.

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Practicing yoga could help people with overweight or obesity improve their cardiometabolic health, according to a study in the open-access journal PLOS Global Public Health by Widya Wasityastuti from the University of Edinburgh, Scotland, and colleagues.

Yoga is a popular form of exercise around the world, and is a gentle and accessible form of exercise for many people. To better understand the potential health benefits of yoga, the authors of this study performed a meta-analysis, examining 30 studies of yoga for its cardiometabolic benefits. They focused on studies which examined outcomes for blood pressure, lipid profiles, glucose homeostasis, markers of inflammation, and measures of antioxidants, and those which examined people with body-mass index over 23 for Asian countries, and 25 for other countries, indicating that participants had overweight or obesity. Of the 30 studies considered, 23 were conducted in Asian countries, while the remaining studies were from the United States, Germany, and Australia.

Across the 30 studies and a total of 2,689 participants, the authors found that people who practiced yoga had a significant decrease in blood pressure, with systolic blood pressure lowered by an average of 4.35 mmHg and diastolic blood pressure by 2.06 mmHg. They also found modest beneficial effects on low- and high-density lipoproteins, types of cholesterol that have been linked to an increased risk of stroke. 

The authors note that the studies analyzed were not specifically recruiting people with obesity, and there was no dose-response measured, so it is unknown how much yoga is needed to produce these effects, though the studies they analyzed favored practice of at least 180 minutes per week.

The studies also focused heavily on Asian participants, and practitioners with comorbidities were excluded from analysis. Finally, it’s important to note that due to the nature of this study, causality cannot be confirmed here despite the correlations found.

Further studies will be needed to understand whether yoga can provide similar benefits to other populations, as well as people with co-morbidities such as diabetes or heart disease.

The authors suggest that while more high-quality trials are needed, the meta-analysis supports potential benefits of yoga for cardiometabolic health in people with overweight and obesity.

The authors summarize: “Our review suggests that yoga may offer a helpful additional option for improving some aspects of cardiometabolic health in adults with overweight or obesity, particularly blood pressure.”

They add: “Yoga is often seen mainly as a wellbeing practice, but our findings suggest it may also support certain cardiometabolic health outcomes in adults with overweight or obesity.”

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Stress, BMI, and hormones linked to earlier puberty in girls

Higher levels of key steroid hormones—combined with elevated stress and body mass index (BMI)—are associated with earlier onset of puberty in girls.

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Higher levels of key steroid hormones—combined with elevated stress and body mass index (BMI)—are associated with earlier onset of puberty in girls, according to a new study at Columbia University Mailman School of Public Health.

The findings are published in The Journal of Clinical Endocrinology & Metabolism.

 Elevated prepuberty urinary levels of glucocorticoids, androgens, and progesterone were strongly linked to accelerated breast development (thelarche). Girls with high glucocorticoid levels alongside high BMI and stress entered puberty an average of seven months earlier than peers with lower levels.

“While stress and BMI have long been recognized as independent predictors of puberty, few studies have examined how they interact with a girl’s hormones,” said Lauren Houghton, PhD, assistant professor of Epidemiology at Columbia Mailman School, and first author. “Our findings challenge conventional research that has largely focused on estrogen and body size, highlighting instead the role of stress and androgens – typically thought of as male hormones– in shaping pubescent development.”

The strongest associations were observed for progesterone, androgens, and glucocorticoids, indicating that multiple hormonal pathways—not just estrogen—play a critical role in the timing of puberty.

For example:

  • Higher glucocorticoid, androgen, and progesterone metabolites were associated with earlier onset of puberty
  • Elevated androgens and progesterone were also linked to a longer duration of puberty
  • Estrogen metabolites were associated with delayed onset, not acceleration
  • The effects of hormones on puberty timing were significantly modified by BMI and stress levels.

 Notably, the associations were consistent regardless of family history of breast cancer.

“Our objective was to identify the full set of hormonal patterns linked to accelerated puberty and test whether BMI and stress modify this relationship,” said Houghton, who is also assistant professor at the Herbert Irving Comprehensive Cancer Center at Columbia. “We predicted that girls with elevated BMI and stress would experience the earliest onset—and that the stress response shifts during this key time for girls.”

The researchers drew on data from the LEGACY Girls Study, a cohort of 1,040 girls ages 6 to 13 recruited across the U.S. States and Canada. Participants were followed every six months with clinical assessments, questionnaires, and biospecimen collection.

The analysis included 327 girls who were at the pre-puberty stage at baseline and provided urine samples at least one year before the onset of puberty. Houghton and colleagues measured a comprehensive panel of steroid metabolites using first-morning urine samples and tracked puberty development using validated clinical scales.

Mothers of the girls completed an Internalizing Composite Scale, which includes subscales for anxiety, depression, and other at-risk status. They also provided information on girls’ family history of all cancers as well as on pregnancy and infancy, including birth weight and their child’s race and ethnicity. Trained research staff measured height and weight twice every 6 months. 

“Unlike prior research, this study simultaneously examined hormonal patterns, BMI, and psychosocial stress—captured through standardized behavioral assessments—within the same cohort,” said senior author Mary Beth Terry, PhD, professor of Epidemiology at Columbia Mailman School, and the Herbert Irving Cancer Center, and Silent Spring Institute.  “Interestingly, we also learned that the associations were consistent regardless of family history of breast cancer.”

The findings may help explain the ongoing trend toward earlier puberty and point to actionable prevention strategies, observed the authors.

 “Stress-reducing interventions and healthy lifestyle changes may help delay early puberty and improve long-term health outcomes,” said Houghton. ‘Because early puberty is linked to increased breast cancer risk later in life, the results have important implications for both pediatric care and public health.”

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