Studies find even minimal physical activity measurably boosts health

October 12, 2020

More than 5 million people around the world die from causes associated with a lack of physical activity. Two research teams at UC San Diego School of Medicine sought to understand sedentary lifestyles, with one study finding that even light physical activity, including just standing, can benefit health, and the other that Americans are still sitting too much.

Stand up, your life may depend on it

It is well-documented that exercise and other moderate-to-vigorous physical activity (MVPA) reduces the risk of many age-related chronic diseases, such as heart disease, type 2 diabetes, numerous cancers, Alzheimer's disease and dementia. However, in the study published October 12, 2020 in Journals of Gerontology: Medical Sciences, researchers found that just standing still was associated with lower risk for mortality.

Led by Andrea LaCroix, PhD, chief of epidemiology at UC San Diego School of Medicine, the research team observed activity levels of nearly 6,000 American women, ages 63 to 97, in partnership with the Women's Health Initiative. Participants wore a research-grade accelerometer for seven days to get accurate measures of how much time they spent sitting, standing still or moving.

Participants who spent the most time standing had a 37 percent lower risk of death when compared to the group who didn't stand up as often. While the highest group was standing still almost 90 minutes per day, a lower risk of death was observed by standing still for as little as 30 minutes per day. The positive effects of standing were even stronger when participants were standing and moving around at the same time.

"Avoiding prolonged sedentary time and engaging in regular physical activity are key strategies for older Americans to improve their prospects for healthy aging," said first author Purva Jain, a doctoral candidate and research fellow. "Specifically low-intensity physical activities, such as standing, are important to study due to their feasibility and safety. During our research, we found that simply spending more time on your feet could have important health benefits, such as a decreased risk of mortality."

Adults in the United States aged 65 and older struggle to meet physical activity guidelines, which generally call for 150 minutes of activity per week. According to the researchers, many Americans spend up to 11 hours a day sitting. Women are specifically at an increased risk of having or developing health concerns associated with inactivity.

"Standing is a feasible approach to interrupt long periods of time sitting that takes place throughout the day," said John Bellettiere, PhD, professor of epidemiology at UC San Diego School of Medicine. "We find this most beneficial for older adults who may not be able to partake in moderate-to-vigorous activities any more, but can still follow a healthy aging lifestyle safely just by replacing sitting with standing up more."

"This is the first study of its kind where we were able to decipher between the benefits of standing still versus standing and moving around," said senior author Andrea LaCroix, PhD, "In doing so, we were able to provide rigorous evidence that even standing still results in positive health benefits."

Modern technology and a sedentary life

In another study, published October 12, 2020 in BMJ Open Sport & Exercise Medicine, researchers with UC San Diego School of Medicine used physical activity data collected as part of a survey of farmers in rural Malawi, whose lives are minimally affected by technology, and compared it to lifestyles of Americans.

With this comparison, the team sought to investigate the potential impact of technology-dominated lifestyles on sedentary time and physical activity.

Their findings showed substantially higher levels of activity amongst the Malawi population versus participants in the United States. Specifically, Americans spend nearly two more hours of sedentary time each day compared to Malawians.

"Being able to compare our current activity levels in the United States to the lifestyle of famers in Malawi really puts an exclamation point on how inactive we are," said first author Michael Pratt, MD, director of the Institute for Public Health at UC San Diego. "We evolved to be active beings and we have left that behind for the luxury of certain modern advancements."

The study was conducted in Malawi, a country in Southeast Africa, where farmers in the Zomba and Ntcheu districts were recruited. Nearly all of the sampled farmers lacked electricity at home and did not own motorized vehicles. Conversely, computers, cell phones, TVs and cars dominate the daily lives of many Americans, resulting in increased sedentary time and less need for physical activity.

To quantify the difference in activity levels in these two samples with contrasting lifestyles, researchers asked 414 farmers in Malawi, ages 15 to 85, to wear an accelerometer every day for seven days. The data were then compared to a sample of 3,258 Americans in the same age range measured in previous studies for the same amount of time. Levels of MVPA and light activity in adults in Malawi were substantially higher and sedentary time were lower than those observed in the United States' sample. Researchers used near-identical data collection, scoring and analyses to make their conclusions.

The Malawian farmers met current physical activity guidelines 94 percent of the time, compared to only 55 percent of the United States sample. However, the results may have a different meaning in Malawi where hard work in predominantly subsistence and non-mechanized agriculture on family farms is essential for household food security.

"This study hints at the profound impact of technologically oriented lifestyles that are becoming ever-more dominant throughout the world," said James Sallis, PhD, Distinguished Professor Emeritus of Family Medicine and Public Health at UC San Diego School of Medicine. "As humans, we are designed to be active, and now we know how much our health depends on it. For people in most high-income countries, we need to put a higher priority on efforts to help them get out of their chairs and move around more throughout the day. For highly-active people in low-income countries, food security is a higher priority."
-end-
Co-authors of the Journals of Gerontology: Medical Sciences study also include: Nicole Glass, UC San Diego; Michael La Monte, University at Buffalo-SUNY, New York; Chongzhi Di, Fred Hutchinson Cancer Center, Seattle; Robert Wild, Health Sciences Center, University of Oklahoma; and Kelly Evenson, University of North Carolina.

The ongoing Sedentary Time and Aging Research program is currently recruiting participants. For more information, visit riseforhealth.ucsd.edu. Co-authors of the BMJ Open Sport and Exercise Medicine study also include: Kelli Cain, Terry Conway, Chad Spoon and Carrie Geremia, all at UC San Diego; Amparo Palacios-Lopez, Alberto Zezza, Isis Gaddis, Akuffo Amankwah, Jed Friedman and Talip

University of California - San Diego

Related Physical Activity Articles from Brightsurf:

Physical activity in the morning could be most beneficial against cancer
The time of day when we exercise could affect the risk of cancer due to circadian disruption, according to a new study with about 3,000 Spanish people  

Physical activity and sleep in adults with arthritis
A new study published in Arthritis Care & Research has examined patterns of 24-hour physical activity and sleep among patients with rheumatoid arthritis, lupus, and knee osteoarthritis.

Regular physical activity seems to enhance cognition in children who need it most
Researchers at the Universities of Tsukuba and Kobe re-analyzed data from three experiments that tested whether physical activity interventions lead to improved cognitive skills in children.

The benefits of physical activity for older adults
New findings published in the Scandinavian Journal of Medicine & Science in Sports reveal how physically active older adults benefit from reduced risks of early death, breast and prostate cancer, fractures, recurrent falls, functional limitations, cognitive decline, dementia, Alzheimer's disease, and depression.

Physical activity may protect against new episodes of depression
Increased levels of physical activity can significantly reduce the odds of depression, even among people who are genetically predisposed to the condition.

Is physical activity always good for the heart?
Physical activity is thought to be our greatest ally in the fight against cardiovascular disease.

Physical activity in lessons improves students' attainment
Students who take part in physical exercises like star jumps or running on the spot during school lessons do better in tests than peers who stick to sedentary learning, according to a UCL-led study.

Physical activity may attenuate menopause-associated atherogenic changes
Leisure-time physical activity is associated with a healthier blood lipid profile in menopausal women, but it doesn't seem to entirely offset the unfavorable lipid profile changes associated with the menopausal transition.

Are US adults meeting physical activity guidelines?
The proportion of US adults adhering to the 'Physical Activity Guidelines for Americans' from the US Department of Health and Human Services didn't significantly improve between 2007 and 2016 but time spent sitting increased.

Children from disadvantaged backgrounds do less vigorous physical activity
Children from disadvantaged backgrounds and certain ethnic minority backgrounds, including from Pakistani and Bangladeshi backgrounds, have lower levels of vigorous physical activity, according to researchers at the University of Cambridge.

Read More: Physical Activity News and Physical Activity Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.