Hiển thị các bài đăng có nhãn muscle. Hiển thị tất cả bài đăng
Hiển thị các bài đăng có nhãn muscle. Hiển thị tất cả bài đăng

Thứ Tư, 8 tháng 3, 2017

The Incredible Benefits of Exercise

Many people hit the gym or pound the pavement to improve cardiovascular health, build muscle, and of course, get a rockin’ bod, but working out has above-the-neck benefits too. For the past decade or so, scientists have pondered how exercising can boost brain function. Regardless of age or fitness level (yup, this includes everyone from mall-walkers to marathoners), studies show that making time for exercise provides some serious mental benefits. Get inspired to exercise by reading up on these unexpected ways that working out can benefit mental health, relationships, and lead to a healthier and happier life overall.

1. Reduce stress. Rough day at the office? Take a walk or head to the gym for a quick workout. One of the most common mental benefits of exercise is stress relief. Working up a sweat can help manage physical and mental stress. Exercise also increases concentrations of norepinephrine, a chemical that can moderate the brain’s response to stress. So go ahead and get sweaty—working out can reduce stress and boost the body’s ability to deal with existing mental tension. Win-win!



2. Boost happy chemicals. Slogging through a few miles on the ‘mill can be tough, but it’s worth the effort! Exercise releases endorphins, which create feelings of happiness and euphoria. Studies have shown that exercise can even alleviate symptoms among the clinically depressed. For this reason, docs recommend that people suffering from depression or anxiety (or those who are just feeling blue) pencil in plenty of gym time. In some cases, exercise can be just as effective as antidepressant pills in treating depression. Don’t worry if you’re not exactly the gym rat type—getting a happy buzz from working out for just 30 minutes a few times a week can instantly boost overall mood.

3. Improve self-confidence. Hop on the treadmill to look (and more importantly, feel) like a million bucks. On a very basic level, physical fitness can boost self-esteem and improve positive self-image. Regardless of weight, size, gender, or age, exercise can quickly elevate a person’s perception of his or her attractiveness, that is, self-worth. How’s that for feeling the (self) love?



4. Enjoy the great outdoors. For an extra boost of self-love, take that workout outside. Exercising in the great outdoors can increase self-esteem even more. Find an outdoor workout that fits your style, whether it’s rock-climbing, hiking, renting a canoe, or just taking a jog in the park. Plus, all that Vitamin D acquired from soaking up the sun (while wearing sunscreen, of course!) can lessen the likelihood of experiencing depressive symptoms. Why book a spa day when a little fresh air and sunshine (and exercise) can work wonders for self-confidence and happiness?

5. Prevent cognitive decline. It’s unpleasant, but it’s true—as we get older, our brains get a little…hazy. As aging and degenerative diseases like Alzheimer’s kill off brain cells, the noggin actually shrinks, losing many important brain functions in the process. While exercise and a healthy diet can’t “cure” Alzheimer’s, they can help shore up the brain against cognitive decline that begins after age 45. Working out, especially between age 25 and 45, boosts the chemicals in the brain that support and prevent degeneration of the hippocampus, an important part of the brain for memory and learning.

6. Alleviate anxiety. Quick Q&A: Which is better at relieving anxiety—a warm bubble bath or a 20-minute jog? You might be surprised at the answer. The warm and fuzzy chemicals that are released during and after exercise can help people with anxiety disorders calm down. Hopping on the track or treadmill for some moderate-to-high intensity aerobic exercise (intervals, anyone?) can reduce anxiety sensitivity. And we thought intervals were just a good way to burn calories!

7. Boost brainpower. Those buff lab rats might be smarter than we think. Various studies on mice and men have shown that cardiovascular exercise can create new brain cells (aka neurogenesis) and improve overall brain performance. Ready to apply for a Nobel Prize? Studies suggest that a tough workout increases levels of a brain-derived protein (known as BDNF) in the body, believed to help with decision making, higher thinking, and learning. Smarty (spandex) pants, indeed.



8. Sharpen memory. Get ready to win big at Go Fish. Regular physical activity boosts memory and ability to learn new things. Getting sweaty increases production of cells in hippocampus responsible for memory and learning. For this reason, research has linked children’s brain development with level of physical fitness (take that, recess haters!). But exercise-based brainpower isn’t just for kids. Even if it’s not as fun as a game of Red Rover, working out can boost memory among grown-ups, too. A study showed that running sprints improved vocabulary retention among healthy adults.

9. Help control addiction. The brain releases dopamine, the “reward chemical” in response to any form of pleasure, be that exercise, sex, drugs, alcohol, or food. Unfortunately, some people become addicted to dopamine and dependent on the substances that produce it, like drugs or alcohol (and more rarely, food and sex). On the bright side, exercise can help in addiction recovery. Short exercise sessions can also effectively distract drug or alcohol addicts, making them de-prioritize cravings (at least in the short term). Working out when on the wagon has other benefits, too. Alcohol abuse disrupts many body processes, including circadian rhythms. As a result, alcoholics find they can’t fall asleep (or stay asleep) without drinking. Exercise can help reboot the body clock, helping people hit the hay at the right time.



10. Increase relaxation. Ever hit the hay after a long run or weight session at the gym? For some, a moderate workout can be the equivalent of a sleeping pill, even for people with insomnia. Moving around five to six hours before bedtime raises the body’s core temperature. When the body temp drops back to normal a few hours later, it signals the body that it’s time to sleep.

11. Get more done. Feeling uninspired in the cubicle? The solution might be just a short walk or jog away. Research shows that workers who take time for exercise on a regular basis are more productive and have more energy than their more sedentary peers. While busy schedules can make it tough to squeeze in a gym session in the middle of the day, some experts believe that midday is the ideal time for a workout due to the body’s circadian rhythms.

12. Tap into creativity. Most people end a tough workout with a hot shower, but maybe we should be breaking out the colored pencils instead. A heart-pumping gym session can boost creativity for up to two hours afterwards. Supercharge post-workout inspiration by exercising outdoors and interacting with nature (see benefit No. 4). Next time you need a burst of creative thinking, hit the trails for a long walk or run to refresh the body and the brain at the same time.

13. Inspire others. Whether it’s a pick-up game of soccer, a group class at the gym, or just a run with a friend, exercise rarely happens in a bubble. And that’s good news for all of us. Studies show that most people perform better on aerobic tests when paired up with a workout buddy. Pin it to inspiration or good old-fashioned competition, nobody wants to let the other person down. In fact, being part of a team is so powerful that it can actually raise athletes’ tolerances for pain. Even fitness beginners can inspire each other to push harder during a sweat session, so find a workout buddy and get moving!

Working out can have positive effects far beyond the gym (and beach season). Gaining self-confidence, getting out of a funk, and even thinking smarter are some of the motivations to take time for exercise on a regular basis.
Source: Sophia Breene for Greatist.com

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Thứ Tư, 15 tháng 6, 2016

Soft-bodied robots: Actuators inspired by muscle

The new actuators could pave the way for entirely soft-bodied robots that are safer than their conventional rigid counterparts



To make robots more cooperative and have them perform tasks in close proximity to humans, they must be softer and safer. A new actuator developed by a team led by George Whitesides, Ph.D. -- who is a Core Faculty member at Harvard's Wyss Institute for Biologically Inspired Engineering and the Woodford L. and Ann A. Flowers University Professor of Chemistry and Chemical Biology in Harvard University's Faculty of Arts and Sciences (FAS) -- generates movements similar to those of skeletal muscles using vacuum power to automate soft, rubber beams.

Like real muscles, the actuators are soft, shock absorbing, and pose no danger to their environment or humans working collaboratively alongside them or the potential future robots equipped with them. The work was reported June 1 in the journal Advanced Materials Technologies.

"Functionally, our actuator models the human bicep muscle," said Whitesides, who is also a Director of the Kavli Institute for Bionano Science and Technology at Harvard University. "There are other soft actuators that have been developed, but this one is most similar to muscle in terms of response time and efficiency."



Whitesides' team took an unconventional approach to its design, relying on vacuum to decrease the actuator's volume and cause it to buckle. While conventional engineering, would consider bucking to be a mechanical instability and a point of failure, in this case the team leveraged this instability to develop VAMPs (vacuum-actuated muscle-inspired pneumatic structures). Whereas previous soft actuators rely on pressurized systems that expand in volume, VAMPs mimic true muscle because they contract, which makes them an attractive candidate for use in confined spaces and for a variety of purposes.

The actuator -- comprising soft rubber or 'elastomeric' beams -- is filled with small, hollow chambers of air like a honeycomb. By applying vacuum the chambers collapse and the entire actuator contracts, generating movement. The internal honeycomb structure can be custom tailored to enable linear, twisting, bending, or combinatorial motions.

"Having VAMPs built of soft elastomers would make it much easier to automate a robot that could be used to help humans in the service industry," said the study's first author Dian Yang, who was a graduate researcher pursuing his Ph.D. in Engineering Sciences at Harvard during the time of the work, and is now a Postdoctoral Researcher.

The team envisions that robots built with VAMPs could be used to assist the disabled or elderly, to serve food, deliver goods, and perform other tasks related to the service industry. What's more, soft robots could make industrial production lines safer, faster and quality control easier to manage by enabling human operators to work in the same space.



Although a complex control system has not yet been developed for VAMPs, this type of actuation is easy to control due to its simplicity: when vacuum is applied, VAMPs will contract. They could be used as part of a tethered or untethered system depending on environmental or performance needs. Additionally, VAMPs are designed to prevent failure -- even when damaged with a 2mm hole, the team showed that VAMPs will still function. In the event that major damage is caused to the system, it fails safely.

"It can't explode, so it's intrinsically safe," said Whitesides.
Whereas other actuators powered by electricity or combustion could cause damage to humans or their surroundings, loss of vacuum pressure in VAMPs would simply render the actuator motionless.

"These self-healing, bioinspired actuators bring us another step closer to being able to build entirely soft-bodied robots, which may help to bridge the gap between humans and robots and open entirely new application areas in medicine and beyond," said Wyss Founding Director Donald Ingber, M.D., Ph.D., who is also the Judah Folkman Professor of Vascular Biology at Harvard Medical School and the Boston Children's Hospital Vascular Biology Program, as well as Professor of Bioengineering at Harvard's John A. Paulson School of Engineering and Applied Sciences (SEAS).



Source: Wyss Institute for Biologically Inspired Engineering at Harvard.

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