High-intensity exercise and your heart

The fitness trend known as high-intensity interval training (HIIT) is still going strong, both at gyms and in online workout classes. HIIT features short bursts of high-intensity exercise (usually lasting one to four minutes) interspersed with periods of lower-intensity activity or rest. But is it a good idea for everyone? Not necessarily.

“HIIT is a great regimen for people who are young and healthy. If you’re older or have heart disease, check with your doctor before trying it,” says Dr. I-Min Lee, a professor of medicine at Harvard Medical School and an expert on the role of physical activity in preventing disease.

Increasingly, cardiac rehabilitation programs (which help people recover from heart attacks and related conditions) are using tailored versions of HIIT. But these closely monitored sessions start with an exercise stress test to make sure people don’t have symptoms such as chest pain, which might make strenuous exercise dangerous. Outside of such settings, HIIT may be unsafe for people who have or are at risk for heart disease.

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One of the largest randomized controlled trials of HIIT, published last year in BMJ Open, suggests that healthy people in their 70s can do these workouts with little risk. But in terms of longevity, moderate-intensity exercise seems to be just as good.

A faster route to fitness

The main advantage to HIIT is that you can boost your cardiovascular fitness faster by working harder instead of longer. Some small, short-term studies hint that HIIT workouts can produce equal or greater improvements in blood pressure and blood sugar compared with moderate-intensity exercise. But because the duration and intensity of the interventions in these studies varied (as did the age and fitness levels of the participants), it’s hard to generalize about the benefits, says Dr. Lee.

The BMJ Open study included 1,567 healthy, active Norwegians with an average age of 73. About half (the control group) were assigned to do 30 minutes of exercise most days. The rest got the same instructions, but half were assigned to replace two of the week’s exercise sessions with HIIT workouts. The other half swapped in moderate-intensity continuous training twice weekly (see “A tale of two workouts”).

A tale of two workoutsResearchers compared two workout strategies in healthy adults ages 70 to 77 during a five-year study in Norway (see main text for more details and results).The moderate-intensity continuous training workout involved exercising for 50 minutes. Participants aimed for a target heart rate of 70% of their estimated maximum heart rate.The “4×4” HIIT workout, which lasted 43 minutes, followed this pattern:1. 10-minute warm-up (brisk walking or jogging) at 60% of maximum heart rate2. Four minutes of high-intensity exercise at 85% to 95% of maximum heart rate3. Three minutes of lower-intensity exercise (jogging or brisk walking) at 60% of maximum heart rate4. Repeat steps 2 and 3 three times, for a total of 4 cycles5. Five-minute cool-down.Note: To get a rough idea of your maximum heart rate, subtract your age from 220. For 60%, multiply by 0.6; for 85%, multiply by 0.85, and so forth. As an example, the estimated maximum heart rate for a 75-year-old would be 220 – 75 = 145; 60% of that would be 145 × 0.6 = 87.

Similar survival rates

During the five-year follow-up, just three people in the study had adverse events (injuries from slipping while exercising outdoors). There were no survival differences among the three groups, although there were slightly fewer deaths in the HIIT group. One possible explanation for the similarity in outcomes: People in the control group exercised more than expected (including doing some high-intensity exercise), and only about half of those in HIIT group actually did regular high-intensity workouts. Also, the people who agreed to participate in the study were more active than the general population, and they had a death rate that was about half of that expected in the general population of the same age.

The take-home message: If you get your doctor’s okay, go ahead and try adding some high-intensity sessions into your workouts, whether that’s jogging, cycling, swimming, or other aerobic exercise. But if that extra effort and sweat sound unpleasant, don’t be concerned that you’re missing out. “If doing HIIT fits in with your lifestyle, go for it. But the most important thing is to find an activity you enjoy and to keep doing it,” says Dr. Lee.

Bible verses for today’s meditation and inspiration: Matthew E. McLaren

2 Corinthians 13:9 For we rejoice when we ourselves are weak but you are strong; this we also pray for, that you be made complete.

Colossians 1:28 We proclaim Him, admonishing every man and teaching every man with all wisdom, so that we may present every man complete in Christ.

Colossians 4:12 Epaphras, who is one of your number, a bondslave of Jesus Christ, sends you his greetings, always laboring earnestly for you in his prayers, that you may stand perfect and fully assured in all the will of God.

2 Corinthians 10:15-16 not boasting beyond our measure, that is, in other men’s labors, but with the hope that as your faith grows, we will be, within our sphere, enlarged even more by you, so as to preach the gospel even to the regions beyond you, and not to boast in what has been accomplished in the sphere of another.

2 Thessalonians 1:3 We ought always to give thanks to God for you, brethren, as is only fitting, because your faith is greatly enlarged, and the love of each one of you toward one another grows ever greater;

2 Peter 3:18 but grow in the grace and knowledge of our Lord and Savior Jesus Christ To Him be the glory, both now and to the day of eternity. Amen.

Ephesians 1:17-18 that the God of our Lord Jesus Christ, the Father of glory, may give to you a spirit of wisdom and of revelation in the knowledge of Him. I pray that the eyes of your heart may be enlightened, so that you will know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints,

Ephesians 3:16-19 that He would grant you, according to the riches of His glory, to be strengthened with power through His Spirit in the inner man, so that Christ may dwell in your hearts through faith; and that you, being rooted and grounded in love, may be able to comprehend with all the saints what is the breadth and length and height and depth, read more

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