Are High-Intensity Workouts Suitable For All Ages?

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Are High-Intensity Workouts Suitable For All Ages?

2017-08-17 15:19:03

　　NEW YORK: Abbreviated, intense workouts may help people of any age become healthier, a new study of old mice that ran on treadmills suggests. Although the experiment involved rodents, not humans, the study found that old mice can tolerate high-intensity interval training and rapidly gain fitness and strength, even if they start off frail and exercise for only a few minutes a week.

　　In recent years, high-intensity interval training has generated considerable attention among exercise scientists and practitioners. In this type of workout, you perform repeated, brief bursts of very intense exercise interspersed with longer periods of easy recovery.

　　 The primary allure of high-intensity interval training is, for most of us, its brevity. A typical high-intensity workout lasts less than 15 minutes, including a warm-up and cool-down, but has been shown in multiple studies to provide health and fitness benefits that are the same as or greater than an hour or more of continuous and relatively moderate exercise.

　　Much of the research into short, intense exercise, or CF rack exercise however, has centred on its benefits for healthy adults, usually those below the age of 50. One famous and still ongoing study in Japan recruited adults past age 55 and found that interval walking — in which volunteers stride briskly for three minutes and then slowly for another three — enabled the older men and women to improve their endurance and blood pressures to a greater extent than walking moderately for the same amount of time.

　　 But that study focused on relatively gentle interval training by a group of relatively healthy older volunteers, leaving many questions still unanswered about whether older, more-frail bodies can successfully complete and respond to typical interval training workouts.

　　 So for the new study, which was published in June in the Journal of Gerontology A, researchers at the University at Buffalo decided to coax frail, elderly mice through a programme of high-intensity interval running.

　　They began by gathering mice that were the rodent equivalent of about age 65 in people. Until that point, these mice had all been sedentary. Some also were frail, according to a numerical scale first developed for people that considers weight, strength, endurance, and how often and rapidly the animals move about.

　　 The scientists tested the animals’ current health and fitness and then divided them into two groups. One, serving as a control, continued with their normal, sedentary lives.

　　The others began a programme of high-intensity interval training on little treadmills. Mice, even elderly ones, generally like to run but, if allowed to set their own pace, will usually stroll along at a moderate, jogging-style speed. The scientists wanted their exercising animals to strain more than that. So they ramped up the incline and speed of the treadmills.

　　 Ultimately, the animals would sprint uphill for one minute followed by a minute of walking, with that interval repeated four times. If the animals faltered at a given speed, the researchers eased off a bit, so that the program’s intensity was individualized and elastic but still high.

　　These interval sessions continued three times a week for four months, which would approximate about eight years in our lives, according to Dr Bruce Troen, a professor of medicine and head of the division of geriatrics at the University at Buffalo, who, with his colleague Kenneth Seldeen and others, conducted the study. (It was funded primarily by the US Department of Veterans Affairs.)

　　 By the end of the study, the mice were the rodent equivalent of septuagenarians.

And those that had remained sedentary displayed the expected physical hallmarks of being that age. They had less muscle mass, can do strength and endurance exercise on power rack than four months before and moved more infrequently and slowly.

　　 But the interval-trained mice seemed in many ways younger than they had been at the start. In particular, they were stronger. When pulled backward gently by researchers, they would cling to a bar longer than at the start of the study. They also had greater endurance capacity, as well as more muscle mass in their hind legs than the sedentary animals, and they scampered faster. Few now were frail.

　　 Perhaps most important, “the animals had tolerated the high-intensity interval training well,” despite their advanced ages, Troen said. None had found the effort impossible.

　　 Of course, mice are not people and their capabilities do not necessarily mimic ours. People, whatever their age, who might wish to try high-intensity interval training should talk with a doctor first, Troen said, and perhaps look for supervised interval training programs at local gyms. Some offer HIIT classes specifically aimed at older participants and led by instructors with training in geriatric exercise.

　　This study also did not compare interval training to other types of exercise and so cannot tease out whether interval training leads to better health outcomes among older people than, for instance, long walks.

　　 But intervals do have that signature advantage, Troen said: “You get done so quickly.”

Are High-Intensity Workouts Suitable For All Ages?

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New Product

High - Quality Incline Chest Fly Machine for Optimal Workouts

Enhance Your Leg Strength with Our Leg Extension Machine

Professional Hip Trainer for Effective Buttock Exercises

Multi Functional Trainer Smith Machine Squat Rack

Efficient and Durable Hip Abduction Machine for Optimal Fitness Training

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Are High-Intensity Workouts Suitable For All Ages?