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Older people in good shape have fitter brains
Seventy- to eighty-year-olds who train for better fitness are better at solving cognitive tasks and are less likely to suffer cognitive impairment.
“Our findings suggest that being fit can protect against mild cognitive impairment in older people,” says Ekaterina Zotcheva.
Just before Christmas, Zotcheva defended her doctoral dissertation on exercise and brain health at the Norwegian University of Science and Technology, NTNU. The day before the defence, the last study for her doctoral degree was published in the highly regarded Sports Medicine journal.
The article is just one of three recent research articles from NTNU that show how important it is for the brain to stay in good physical shape as you get older. Common to all three articles is that they are based on data from the world’s largest training study for older adults, the Generation 100 study from the Cardiac Exercise Research Group.
Dementia risk
“The Generation 100 study has been going on for almost ten years now. After the study participants had been exercising for five years, we tested the cognitive function of almost 1000 of them.”
“The men and women who had maintained or increased their physical fitness during the study had better brain health than those whose fitness had declined over the five years,” says Zotcheva.
The cognitive test that the participants took is the same one that is often used to check whether people are at risk of developing dementia.
The test assesses short-term memory, execution function and the ability to orient oneself in time and space. Scoring below a certain number indicates a risk of mild cognitive impairment.
“We know that mild cognitive impairment can lead to dementia for some individuals. The greater the increase in a participant’s fitness level during the five years of the study, the lower their probability was of developing mild cognitive impairment,” says Zotcheva.
Better at problem solving
Good conditioning appears to be an important prerequisite for good brain function in the elderly in the other two research articles as well. In both of these studies, the researchers tested the brain health of more than 100 of the participants in the Generation 100 study at start-up and after one, three and five years of training.
“Participants who were in good shape, both when the study started and later in the study, had a faster reaction time. The ones who improved their fitness level gained a somewhat better working memory,” says NTNU professor Asta Håberg.
The ability to solve cognitive problems was tested using the web-based Memoro platform, which Håberg developed in collaboration with neuropsychologist Tor Ivar Hansen.
Less brain atrophy
Håberg has been involved in the work with all three recent research articles. In the third study, the researchers performed MRI scans of the participants’ brains to see how the brain volume and thickness of the cerebral cortex changed throughout the study. Here, too, the most energetic participants came out best.
“Participants who were in good shape when the study started had a thicker cerebral cortex after one, three and five years, as compared with those who had lower maximum oxygen uptake. But we didn’t find any effect from increasing fitness during the study,” says Håberg.
The cerebral cortex is the outermost layer of the brain and is important for several important brain functions, such as attention, ability to make choices, working memory, abstract thinking and memory. This part of the brain becomes thinner with age, and thinning of the cerebral cortex in different areas is linked to different types of dementia, such as Alzheimer’s disease and frontotemporal dementia.
Fitness more important than type of exercise
All 70- to 77-year-olds in Trondheim were invited to the Generation 100 study in 2012. Those who agreed to participate were randomly assigned to five years of exercise of various kinds. One group would primarily do high intensity intervals, a second group would mainly go for walks or do other exercise with moderate intensity, and the last group would try to follow the activity recommendations of the health authorities to be physically active for at least 150 minutes each week.
The first two groups were followed up most closely by the researchers, and were offered two organized training sessions each week. The NTNU researchers looked beyond the connection between fitness and brain health and also investigated whether the type of training follow-up that participants received made a difference.
“Our results show that organized training follow-up may have given older men, but not older women, better cognitive function and lowered the probability of mild cognitive impairments. But all in all, it seems that the most important thing is that you actually train in a way that increases your fitness, regardless of whether you get organized help to be physically active or not,” says Zotcheva.
Less brain atrophy than expected
“In the groups that received follow-up with high-intensity training and training with moderate intensity, respectively, we found somewhat greater loss of brain volume in deep areas of the brain than among those who trained themselves. But we have to emphasize that everyone in the Generation 100 study – regardless of the form of exercise they did – had less brain loss than expected for people in their 70s. The group that trained on their own without organized follow-up had the least shrinkage in the hippocampus and thalamus,” Håberg says.
The training follow-up in Generation 100 was not decisive for the participants’ ability to solve cognitive tasks.
“The groups that were able to attend organized training didn’t perform any better than the group that trained on their own on various tasks, such as remembering where an object is located, memorizing words, processing information quickly or planning,” says Håberg.
Maintained good cognitive function
“It’s still worth noting that the 70-77-year-old participants on average had the same cognitive abilities after five years as at start-up, and that during the study period they even improved on some of the tests. The results show that being in good shape like the Generation 100 participants were, is important for maintaining good brain function,” Håberg says.
The training effect thus seems to be greatest for people who enter retirement age in good shape, and exercise that improves fitness can provide further benefits. So how should the elderly train to get in better shape?
“Several paths can lead to that goal, and the most important factor is to find an activity you enjoy and can continue with over time. In order to maintain or increase your fitness, you should in any case exercise regularly in a way that gets you out of breath and sweaty,” says Zotcheva.
NewsMakers
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.
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.”
NewsMakers
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.
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.”
NewsMakers
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.
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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