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Smarter, safer workouts with a wearable fitness tracker – Harvard Health

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Smarter, safer workouts with a wearable fitness tracker – Harvard Health


Do you need a little extra inspiration to be more active throughout the day? Or perhaps you’re wondering if your workouts are challenging enough to optimize your cardiovascular health. And if you have any type of heart disease, you’ll want to be sure you’re not pushing yourself too hard during vigorous physical activity. For each of these situations, a wearable fitness tracker may be a worthwhile investment, especially when you consider that exercise is widely considered the best medicine — not just for your heart but for your overall health.

You may already own such a device, as most smart watches include a range of fitness tracking features alongside their other functions. Other options include wrist-worn bands and smart rings that focus primarily on health and fitness tracking.

“The information these wearables provide is measurable, meaningful, and motivating,” says Dr. Sawalla Guseh, director of the Cardiovascular Performance Program at Harvard-affiliated Massachusetts General Hospital. “It’s like having a goal-setting coach with you around the clock,” he says.

Long-term monitoring may also alert you to heart problems, says Dr. Guseh. “I had one patient who didn’t feel chest pain or related symptoms, but he noticed his exercise performance declining over time. It turned out he had coronary artery disease,” he says.

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Features to watch

Here are some of the features on wearable fitness devices that are worth checking out.

Stand or move reminders. Many wearables feature customizable notifications — a message on the watch face or a sound or vibration — to remind you to stand up and move around for a short period of time to break up long stretches of sitting. Even dedicated runners need to avoid being sedentary throughout the day to keep their hearts healthy, says Dr. Guseh (see “Stand up for your heart” in the June 2025 Heart Letter).

Daily step counts. Although you’ve likely heard that 10,000 steps per day is a good goal, that number was based on a Japanese marketing scheme and not actual data. Recent evidence finds that a lower number — anywhere from 4,000 to 7,000 daily steps — is linked to improved heart health. A smartphone (provided you carry it with you most of the day) can give a close estimate of your daily step count, but a wearable will be more accurate. Data from your smart watch automatically syncs with your smartphone, and most have apps that display trends in your step counts and other exercise data over weeks, months, and years.

Heart rate zones. Wearables make it easier to assess your exercise effort with heart rate zones, which classify how intensely you’re exercising by measuring your heart rate. The zones are based on your maximum (or peak) heart rate (MHR) — an estimate of the upper limit of what your cardiovascular system can handle during physical activity. A commonly used formula for MHR is 220 beats per minute minus your age, but you should consider this a ballpark figure, since factors other than age are at play.

Different wearables have varied numbers of heart rate zones, although five is typical. Zones 2 and 3 are generally thought to correspond to moderate-intensity exercise, while zones 4 and 5 correspond to vigorous-intensity exercise. But because they’re not individualized, they may not be accurate for everyone, Dr. Guseh notes. Ideally, you should do at least 150 minutes of moderate-intensity exercise, or 75 minutes or more of vigorous-intensity exercise, or an equivalent combination every week.

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Heart rate recovery (HRR). This value reflects your heart’s ability to return to its normal, resting pace after you stop exercising. It’s the difference between your peak heart rate during exercise and your heart rate at a set time after you stop (typically one to two minutes). A value of 20 beats per minute is considered good, and higher is even better.

Maximal oxygen consumption (VO2 max). This value is the maximum amount of oxygen a person can use during intense exercise. It can be measured directly when a person runs on a treadmill with an oxygen mask in a lab. Some wearables estimate it based on an algorithm that uses data such as your MHR, HRR, pace, weight, and sex. VO2 max is a powerful predictor of cardiovascular health. “The absolute number may not always be accurate, but the trends can be useful. If your VO2 max rises over time, that’s a strong sign your training is improving your fitness,” says Dr. Guseh.

Heart rate variability (HRV). This value is a measure of the variation in time between heartbeats — differences that are just fractions of a second. More variability (a higher value) suggests better heart health, because it reflects the heart’s ability to respond quickly to rapid changes occurring throughout the body. Most wearables report this value, but there isn’t a recommended target because it varies widely depending on your age, sex, fitness level, and medical history. However, it can be useful to track trends in your HRV over time. HRV often falls after a period or stress or illness but then bounces back — a sign that you’re good to go back to exercising, says Dr. Guseh.

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Exercising after a heart disease diagnosis

Anyone who’s had a heart attack, heart surgery, or other heart disease diagnosis should attend cardiac rehabilitation, a personalized program of supervised exercise and heart-healthy lifestyle coaching. It starts with an exercise stress test, which involves closely monitoring your heart during exercise to tailor an effective yet safe exercise program for you.

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“Cardiac rehab is a tried-and-true method of helping people get back into shape, with a standardized protocol that works well for most people,” says cardiologist Dr. Sawalla Guseh, assistant professor of medicine at Harvard Medical School. However, people who were previously exercising at higher intensities and therefore quite fit may get bored at cardiac rehab because it’s too easy for them, he says. If that’s the case for you, consider requesting a referral to a sports cardiologist, who can provide more rigorous and detailed testing and advice, including a specific heart rate threshold you should be careful not to exceed.



Image: © Oscar Wong/Getty Images

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Study finds 5 more minutes of exercise could reduce your risk of death by 10%

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Study finds 5 more minutes of exercise could reduce your risk of death by 10%

The universal quest for immortality continues, and new research has hinted at a small lifestyle change that could reduce overall death rates in countries if we start taking our movement more seriously. 

Conducted by a global research team, the study named ‘Deaths potentially averted by small changes in physical activity and sedentary time: an individual participant data meta-analysis of prospective cohort studies’ was published in The Lancet and suggested that adding five more minutes of physical exercise a day to your life could reduce death rates by 6 per cent. 

Conducted on cohorts wearing on-person devices from Norway, Sweden and the USA, scientists analysed activity and sedentary levels to deduce what was causing higher death rates and found that a little change could go a long way.

With the help of the study’s author and additional experts from the field, we delved into the details and uncovered exactly what we need to do to make sure we are maximising our health before it’s too late. 

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A little change makes all the difference 

We already know that we should all be getting out and exercising to ensure everything in our bodies is running smoothly, but just how important is that daily movement and could it be contributing to national mortality rates? 

Professor Ulf Ekelund works in the Physical Activity and Health department at the Norwegian School of Sport Sciences and was one of the authors of the study. He broke down the data for HELLO!

The professor explained: “We estimated the number of deaths potentially prevented by five and ten-minute increases in moderate intensity physical activity if all individuals in the population adhered to this increase. 

“We analysed the data using two different approaches: 

  1. ‘High-risk approach’ comprising the least active 20 per cent of the population 
  2. ‘Population approach’ comprising 80 per cent of the population (excluding the most active 20 per cent).

He continued: “We found that six per cent and ten per cent of all deaths might be prevented in the two different scenarios, respectively, if all individuals made these changes. 

“If an individual is completely inactive, every little move counts. For example, the least active 20 per cent in our study sample were only active for an average of about two minutes per day of moderate intensity. If all these individuals increased their activity by five minutes per day, it might reduce the number of deaths by six per cent annually.”

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Dr Darren Player, a professor in Musculoskeletal Bioengineering at University College London, who was not involved in the study, shared his interpretation of the data with us and added: “The key finding was that an increase in Moderate-to-Vigorous Physical Activity (MVPA) by only five minutes per day for the least active individuals prevented 6 per cent of all deaths. This effect could extend to as much as 10 per cent in all individuals, except for those who are already very active.” 

© Getty Images
Adding five minutes of exercise on to your day could have massive results

Exercise versus moderate intensity 

In terms of how to achieve the correct level of activity and movement, we have to understand the difference between physical activity and moderately intense movement. They are different and will yield different results. 

Professor Ulf explained: “There is a clear distinction between moderate intensity activity and exercise. Brisk walking is an excellent type of moderate intensity, whereas exercise is defined as something people do with the purpose to enhance fitness and/or health. It is structured and repetitive. Exercise is only a small proportion of all the physical activity people do. 

“Physical activity [PA] is any bodily movement that increases energy expenditure above resting levels. It can be conducted with different intensities from very low to very strenuous. Exercise is a subset of PA which is planned, structured and done with a specific purpose.” 

Woman and her dog running towards the sunset on a country road© Getty Images
It matters what kind of exercise you do, so we need to understand the difference between physical exercise and intense movement

Could any of this add years onto our lives? 

While this study was specifically about reducing death rates through exercise and movement, it made us wonder how it would affect the number of years we could all expect to live. Would incorporating an extra five minutes of movement add any time to the general life expectancy? 

Dr Darren referred to data from the UK Biobank to share his estimations. He said: “This is quite a difficult question to answer, but there is some evidence. The following paper suggests that there could be an increase in life expectancy of 0.9 years for inactive women and up to 1.4 years for inactive men. 

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“The increases are dependent on the nature of physical activity, with higher intensity and greater volume (total amount of exercise) being the key factors. This is a large UK Biobank study, which does have some strengths for the analyses.” 

He continued: “However, the factors that contribute to life expectancy and mortality are complex and varied, with further studies required to understand the picture fully. Particularly, the effect of resistance training combined with other forms of physical activity is likely to have a greater effect than one type of activity alone. Further research is required in this area to provide suitable evidence.” 

What type of exercises can I do during my five extra minutes a day? 

According to the NHS, there are a variety of movements that you can incorporate into your routine to make sure you are hitting the target of five extra minutes of exercise per day to increase your longevity. 

These range from simple activities like making a cup of tea to pushing a lawnmower and dancing around your living room for fitness, depending on the intensity you are able for. While the study suggested five minutes of moderate intensity exercise, the health service broke down its recommendations into sections based on vigour:

Light activity: 

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  • Getting up to make a cup of tea
  • Moving around your home
  • Walking at a slow pace
  • Cleaning and dusting
  • Vacuuming

Moderate activity:

  • Walking for health
  • Water aerobics
  • Riding a bike
  • Dance for fitness
  • Pushing a lawnmower
  • Hiking

Intense activity: 

  • Running
  • Swimming
  • Football
  • Hiking uphill
  • Martial arts

It also suggested some easy-to-do strength exercises that involve using a kitchen chair or filled bottles of water as props:

  • Sit-to-stand 
  • Mini squats 
  • Calf raises 
  • Standing sideways leg lift 
  • Standing leg extension 
  • Wall press-up 
  • Bicep curls 
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Fitness

Fitness Class Volume Tied to Exercise Intensity Perception

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Fitness Class Volume Tied to Exercise Intensity Perception

About The Study: In this comparative effectiveness study, reducing music volume in group fitness classes did not lead to meaningful reductions in perceived exertion and may reduce the risk of noise-induced hearing loss. These findings support implementing safer sound practices in fitness environments and underscore the need for increased awareness and education on hearing protection.

/Public Release. This material from the originating organization/author(s) might be of the point-in-time nature, and edited for clarity, style and length. Mirage.News does not take institutional positions or sides, and all views, positions, and conclusions expressed herein are solely those of the author(s).View in full here.

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Reward yourself by exercising regularly at One to One Fitness | CWRU Newsroom | Case Western Reserve University

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Reward yourself by exercising regularly at One to One Fitness | CWRU Newsroom | Case Western Reserve University

Now is the time to recommit to your health in time to feel your best for all your summer activities! One to One Fitness Center offers several ways to save in March.

Members of the Case Western Reserve University community can take advantage of sign-up specials designed to reward themselves for creating healthy habits.

Individuals can get 50% off the initiation fee (regularly $50 plus tax) and earn back what they do pay by exercising eight or more days in both April and May. Learn more online about this deal on initiation fees.

Students also can get additional savings:

  • Graduate students who are enrolled for the spring semester receive summer membership free.
  • With Spartan Shape Up memberships, affiliate students pay just $40 per month for membership from now through May, and no initiation fee or security deposit is required.
  • Students also can pay $44 plus tax per month with a month-to-month, ongoing plan. No initiation fee or security deposit required.

One to One Fitness Center, owned and operated by CWRU, is known for offering personal, professional, friendly and clean services. Memberships include full access to the 28,000-square-foot fitness center, group exercise classes, validated parking in Lot 53, towel and locker service, and member discounts on programs and services.

Members also can add their spouse or partner to their account for $30 plus tax per month. The center also offers personal training, Pilates Reformer, massage therapy and sound bath therapy, swim lessons, and more.

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Visit the One to One Fitness Center website, email onetoone@case.edu or call 216.368.1121 for more information.

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