Health
Heat and cold as health hazards
Both hot and cold environments trigger a stress response in the human body and can lead to cardiovascular problems.
Newswise — Both hot and cold environments trigger a stress response in the human body and can lead to cardiovascular problems. Physiologist Justin Lawley from the Department of Sport Science at the University of Innsbruck and colleagues have recently investigated both factors in scientific studies. The results, which were published in the Journals Scientific Reports and Experimental Physiology, are especially interesting in light of the current multiple global crises.
The climate and energy crises are currently among the greatest challenges of our time and are having a direct physical effect on people’s health. For example, the climate crisis is causing more frequent, longer and more intense heat waves, which are responsible for more deaths than natural disasters. Moreover, the energy crisis is causing a rise in energy costs and forcing many households to heat their homes less often or not at all.
The physiological responses to a simulated heat wave and cold ambient temperatures have now been investigated by Justin Lawley, together with his research group, the Laboratory of Exercise and Environmental Physiology, and international scientists in two studies – the focus was on the cardiovascular system. “In both studies, we replicated real-world environmental temperatures the body might be exposed to and were able to show physiological responses that could help explain known seasonal variations in cardiovascular deaths,” explains Lawley.
Heat study
As part of the Horizon 2020 Heat Shield project, Lawley’s group collaborated with colleagues from Slovenia to examine how heat waves affect the health of industrial workers. Seven male participants spent nine consecutive regular workdays in a controlled laboratory setting.
On the first and last three days, normal summer temperatures for Central European conditions ranged from 25.1 to 25.7 degrees during work and 21.8 to 22.8 degrees during rest periods. Days four through six represented the heat wave; during this period, researchers created ambient temperatures between 35.2 and 35.8 degrees during work periods and 25.5 to 27.1 degrees during rest periods including while sleeping at night. During the entire study, participants completed daily tasks to simulate typical industrial work.
“We used a protocol in this study that simulates current heat wave conditions in combination with orthostatic stress, which means changing posture, to determine cardiovascular and thermoregulatory stress in industrial workers,” Lawley describes. The results show that even relatively mild heat waves cause an increase in core and skin temperatures and an increase in skin blood flow. While these physiological reactions help the body from overheating at rest, during standing the body must now defend both internal temperature and maintain blood pressure to prevent fainting, which puts an extra strain on the cardiovascular system.
Interestingly, many of these responses persisted after the heat wave was over, suggesting a residual effect of the heat wave. “These responses reflect the stress on the cardiovascular system that industrial workers face during heat waves, which can lead to heat illness, fainting and even potentially death due to accidents or serious medical complications in persons with underlying cardiovascular disease,” Lawley points out.
Cold study
In another study, Lawley, along with a team of eleven researchers, examined the impact of mild cold exposure on the cardiovascular system, with a specific focus on what mechanisms are responsible for the increase in blood pressure. In addition to researchers from Innsbruck, scientists from Great Britain and Canada were also involved.
Since preventing a rise in blood pressure in the cold is important, the study aimed to examine if the rise in vessel resistance (i.e. vasoconstriction) is due to a change in blood flow in the skeletal muscles or simply the skin. In a laboratory at the Department of Sport Science at the University of Innsbruck, the researchers cooled the skin temperature of 34 test subjects from a normal 32 to 34 degrees to about 27 degrees with ten degrees cold air – on one occasion the entire body was cooled, on another only the face was cooled.
“We observed that when the entire surface of the body is cooled, blood pressure increases mainly due to an increase in vascular resistance of the skin, although there was also a slight reflex increase in resistance of the blood vessels inside the skeletal muscle. However, importantly, when only the face was cooled, we saw a very similar increase in blood pressure that was due to a reflex increase in vascular resistance of the skin throughout the whole body,” Lawley describes.
Thus, the team was able to show that the mechanism(s) responsible for the rise in blood pressure during cold exposure depends on which parts of the body are cold. These data are important to educate the population about preventing the potential negative consequences of cold exposure because contrary to the perception of many, cold is even more dangerous to the body than heat.
“It doesn’t take sub-zero temperatures – as you might think – to cause serious reactions in the body, which will become common for many people unable to heat their homes during the energy crisis. While people typically know to wear warm clothing to protect the skin of their body, arms and legs, we were able to show that protecting the face is equally important even in a mild ambient temperature of ten degrees,” Lawley continues.
Extreme effects
Both studies show that climatic conditions can have extreme effects on our cardiovascular system. While negative health aspects triggered by heat waves will increase due to the climate crisis, it is particularly surprising that even cold temperatures around 10 degrees can have significant negative effects on our cardiovascular system even in young people who were part of these studies. Future studies extending these findings to our ageing population and those with pre-existing medical conditions will certainly help mitigate the risk of these new environmental challenges.
Link: https://www.nature.com/articles/s41598-022-24216-3
Source: University of Innsbruck
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health and wellness
5 Steps to Properly Manage Blood Pressure
Nearly half of all American adults have high blood pressure, or hypertension, according to the Centers for Disease Control and Prevention.
(Family Features) Nearly half of all American adults have high blood pressure, or hypertension, according to the Centers for Disease Control and Prevention. Of those, about 75% don’t have it under control, and many may not even realize they have it unless they experience other complications.
In fact, high blood pressure is a leading cause and controllable risk factor for heart disease and stroke as well as other issues such as kidney failure, vision loss and sexual problems. However, the American Heart Association recommends taking these simple steps to help control your levels and manage risks.
1. Know Your Numbers
In most cases, normal blood pressure is 120/80 mm HG or less. Readings consistently higher than 130/80 are considered high blood pressure. Have your blood pressure measured at least once a year by a health care professional and regularly monitor it at home with a validated monitor then discuss the readings with your doctor. Getting accurate readings can help ensure the most appropriate treatment should any problems arise.
2. Maintain a Healthy Weight
If you’re overweight or obese, you’re at increased risk of high blood pressure. Losing just 3-5% of your body weight can help improve your numbers. There are an abundance of plans and programs available that can assist with weight loss, and taking positive steps with a friend or family member may help with motivation.
3. Get Active
To maximize health benefits and help keep blood pressure in the normal range, the American Heart Association recommends adults get at least 150 minutes per week of moderate activity, 75 minutes of vigorous activity or a combination of the two. Try activities like brisk walking, swimming, bicycling or dancing. For example, the Get Down with Your Blood Pressure campaign uses music and dance to help remember the four easy steps to self-monitor blood pressure:
- Get It – grab your self-monitoring blood pressure (SMBP) device
- Slip It – slide the SMBP cuff up your arm
- Cuff It – wrap the cuff snugly, but not too tight
- Check It – check your blood pressure on the device
4. Eat Well
Making small, simple changes to your eating habits can go a long way toward keeping you and your family healthy. Eating fruits and vegetables, such as mangos, avocados and blueberries, can lower blood pressure over time. Other smart choices include nuts and seeds, whole grains, lean proteins and fish.
5. Reduce Alcohol and Tobacco Usage
Smoking compounds risk factors for heart disease, such as high blood pressure and diabetes, and the chemicals in tobacco smoke can harm your heart and blood vessels. Similarly, consuming alcohol excessively (more than two drinks per day) is associated with high blood pressure. Limiting alcohol consumption and stopping smoking – or avoiding secondhand smoke – can help reduce your risk.
If you develop high blood pressure, work with a health care professional to manage it, and visit heart.org/hbpcontrol to find local blood pressure resources, step-by-step self-monitoring videos and more.
Monitoring Your Blood Pressure at Home
Knowing how to correctly check your blood pressure is important, especially if your doctor recommends regular self-monitoring at home.
- Be still. Don’t smoke, drink caffeine or exercise during the 30 minutes before measuring your blood pressure. Empty your bladder and take at least 5 minutes of quiet rest time before measuring.
- Sit correctly. Sit with your back straight and supported. Keep your feet flat on the floor and your legs uncrossed. Support your arm on a flat surface, such as a table, with your bicep at heart level. Place the bottom of the cuff directly above the bend of your elbow. Never take measurements over sleeves or other clothing.
- Measure at the same time every day. For greatest consistency, take readings at the same time daily, such as a set time in the morning and evening.
- Take multiple readings and record the results. Each time you measure, take 2-3 readings approximately 1 minute apart and record the results to share with your doctor.
This project is supported by cooperative agreements (CPIMP201227 and CPIMP201228) with the Office of Minority Health (OMH) of the U.S. Department of Health and Human Services (HHS), as part of a financial assistance award totaling $14.6 million in partnership with the Health Resources and Services Administration (HRSA). The contents do not necessarily represent the official views of, nor an endorsement by OMH/OASH/HHS or the U.S. Government. For more information, please visit https://www.minorityhealth.hhs.gov/.
Photos courtesy of Getty Images
SOURCE:
American Heart Association
Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.
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6 Ways to Build Lasting Healthy Habits
Starting on a path toward healthy habits is often easier than maintaining them long term. This year, you can avoid a major pitfall of healthy resolutions and build healthy habits that stick by working small, positive steps into your daily life.
(Family Features) Starting on a path toward healthy habits is often easier than maintaining them long term. This year, you can avoid a major pitfall of healthy resolutions and build healthy habits that stick by working small, positive steps into your daily life.
In fact, healthy habits are the first suggested treatment strategy for people whose blood pressure and cholesterol levels are creeping higher than normal, according to an American Heart Association scientific statement.
“The current guidelines for managing high blood pressure and cholesterol recognize that otherwise healthy individuals with mildly or moderately elevated levels of these cardiovascular risk factors should actively attempt to reduce these risks, and increasing physical activity is a great place to start,” said Bethany Barone Gibbs, Ph.D., chair of the statement writing group and chair of the department of epidemiology and biostatistics at West Virginia University School of Public Health.
These six ideas from the American Heart Association’s Healthy for Good Habit Coach can help.
Bust Common Habit-Building Myths
You may be surprised to learn the truth about creating and sticking to healthy habits. One myth is getting healthy means doing things you don’t like. Research shows positive emotions make habits stick, so set your intentions on something you enjoy. Another misconception is big results require big changes, which may lead to overly ambitious habits. However, the simpler the routine is, the more likely it is to become habit.
Work with Your “Brain Loops”
Your brain creates “loops” for habits made up of three things: a cue, a routine and a reward. Each time the loop is repeated, it becomes more routine and may become automatic. Knowing this, you can design cues for developing new, healthy habits, such as setting walking shoes by the bed to start a walking habit. The routine is putting on the shoes and walking around the block, and the reward is the pleasant sensations and brighter mood from a morning stroll.
Create Cues That Work for You
Most successful health habits begin with a cue. The cue can be external in your environment or internal in terms of your mindset. The more consistent the cue, the more likely it is to trigger the habit. Hacking your brain’s reminder system can help you remember your cue. Some examples of visual cues are placing a sticky note where you’ll see it often, keeping a water bottle on your desk or refrigerating fresh veggies at eye level.
Build a Routine That Supports Your Goals
Positive and consistent habits are important to achieve your personal goals. Small habits done consistently can add up to big results. To create a new healthy habit, think through the steps that could lead to your desired outcome. Ask yourself whether you want to do it, if it’s easy and if it’s high impact. It’s important to choose habits that make a difference and move you closer to your goals.
For example, if one of your goals is improving your heart health, a meaningful habit might be to move more. Increasing physical activity can help lower blood pressure and cholesterol along with many other health benefits, Gibbs said.
“Every little bit of activity is better than none,” she said. “Even small initial increases of 5-10 minutes a day can yield health benefits.”
Use Rewards to Make Habits Stick
Start by choosing a habit you enjoy that’s rewarding by itself. If you’re more of a dancer than runner, increase your physical activity with an upbeat dance class. You might also look for a more enjoyable version of a new habit, such as getting more fruits and veggies by sipping on a delicious smoothie.
Understand Resets are Part of the Process
New habits are experiments. If they don’t stick, you haven’t failed. Instead, you’ve learned what doesn’t work, which is useful. Get curious and ask yourself which part of the habit didn’t work for you. Maybe the cue was ineffective. Maybe the steps of the routine were too ambitious and you need to split them into smaller, easier steps. If you realize you don’t enjoy the habit, stop doing it and try something else.
Find more inspiration and ideas to jumpstart healthy habits this year at heart.org/habits.
Photos courtesy of Getty Images
SOURCE:
American Heart Association
STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.
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Lifestyle
Get chronic UTIs? Future treatments may add more bacteria to your bladder to beat back harmful microbes
Researchers developed a biomaterial releasing beneficial E. coli to combat urinary tract infections by outcompeting harmful bacteria, aiming to reduce antibiotic resistance and manage chronic UTIs effectively.
Sarguru Subash, Texas A&M University
Millions of people in the U.S. and around the world suffer from urinary tract infections every year. Some groups are especially prone to chronic UTIs, including women, older adults and some veterans.
These infections are typically treated with antibiotics, but overusing these drugs can make the microbes they target become resistant and reduce the medicines’ effectiveness.
To solve this problem of chronic UTIs and antibiotic resistance, we combined our expertise in microbiology and engineering to create a living material that houses a specific strain of beneficial E. coli. Our research shows that the “good” bacteria released from this biomaterial can compete with “bad” bacteria for nutrients and win, dramatically reducing the number of disease-causing microbes.
With further development, we believe this technique could help manage recurring UTIs that do not respond to antibiotics.
Bringing bacteria to the bladder
For the microbes living in people, nutrients are limited their presence varies between different parts of the body. Bacteria have to compete with other microbes and the host to acquire essential nutrients. By taking up available nutrients, beneficial bacteria can stop or slow the growth of harmful bacteria. When harmful bacteria are starved of important nutrients, they aren’t able to reach high enough numbers to cause disease.
Delivering beneficial bacteria to the bladder to prevent UTIs in challenging, though. For one, these helpful bacteria can naturally colonize only in people who are unable to fully empty their bladder, a condition called urinary retention. Even among these patients, how long these bacteria can colonize their bladders varies widely.
Current methods to deliver bacteria to the bladder are invasive and require repeated catheter insertion. Even when bacteria are successfully released into the bladder, urine will flush out these microbes because they cannot stick to the bladder wall.
Biomaterials to treat UTIs
Since beneficial bacteria cannot attach to and survive in the bladder for long, we developed a biomaterial that could slowly release bacteria in the bladder over time.
Our biomaterial is composed of living E. coli embedded in a matrix structure made of gel. It resembles a piece of jelly about 500 times smaller than a drop of water and can release bacteria for up to two weeks in the bladder. By delivering the bacteria via biomaterial, we overcome the need for the bacteria to attach to the bladder to persist in the organ.
We tested our biomaterial by placing it in human urine in petri dishes and exposing it to bacterial pathogens that cause UTIs. Our results showed that when mixed in a 50:50 ratio, the E. coli outcompeted the UTI-causing bacteria by increasing to around 85% of the total population. When we added more E. coli than UTI-causing bacteria, which is what we envision for future development and testing, the proportion of E. coli increased to over 99% of the population, essentially wiping out the UTI-causing bacteria. Moreoever, the biomaterial continued releasing E. coli for up to two weeks in human urine.
Our findings suggest that E.coli could stick around and survive in the bladder for extended periods of time and successfully decrease the growth of many types of bacteria that cause UTIs.
Improving biomaterials
Our findings show that E. coli can not only control harmful bacteria it’s closely related to but also a broad range of disease-causing bacteria in humans and animals. This means scientists might not need to identify different types of beneficial bacteria to control each pathogen – and there are many – that can cause a UTI.
Our team is currently evaluating how effectively our biomaterial can cure UTIs in mice. We are also working to identify the specific nutrients that beneficial and harmful bacteria compete over and what factors may help beneficial bacteria win. We could add these nutrients to our biomaterial to be released or withheld.
This research is still at an early stage, and clinical uses are not in development yet, so if it does reach patients it will be well in the future. We hope that our technology could be refined and applied to control other bacterial infections and some cancers caused by bacteria.
Sarguru Subash, Assistant Professor of Veterinary Pathobiology, Texas A&M University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.
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