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Physical activity has established benefits for health. The World Health Organization recommends adults do a minimum of 150-300 minutes of moderate or 75-150 minutes of vigorous activity each week. This can include active transport from place-to-place, exercise for fun and fitness, energetic housework or physical activity at work.
Authors
Emmanuel Stamatakis
Professor of Physical Activity, Lifestyle, and Population Health, University of Sydney
Matthew Ahmadi
Postdoctoral Research Fellow, University of Sydney
Raaj Kishore Biswas
Research Fellow & Biostatistician, University of Sydney
These amounts can be accrued by being, as the WHO recommends, regularly active throughout the week, or being a “weekend warrior” who does the bulk of their activity on one to two days only, which don’t need to be consecutive.
So far, experts haven’t fully established which of the two patterns is better for overall health. For many people, busy lifestyles may make it hard to be physically active every day. It may be more feasible to squeeze most physical activity and exercise into a few days.
Fresh analysis of the large UK Biobank database attempted to compare these two patterns of weekly activity and compare how they reduced cardiovascular risk for heart attacks, heart failure, irregular heart beat and stroke.
What the new study found
Researchers analysed records from 89,573 participants who wore a wrist activity tracker for seven days and were tracked for cardiovascular events for over six years.
Those who did less than the WHO recommended 150 minutes of moderate-to-vigorous physical activity per week were considered inactive. About a third (33.7%) of participants were inactive. Some 42.2% were active weekend warriors (they did at least 150 minutes and more than half of it occurred within one to two days) and 24% were regularly active (at least 150 minutes with most activity spread out over three or more days).
Researchers considered the potential factors that could explain the link between physical activity and new cases of cardiovascular events, such as smoking and alcohol intake. They found both active groups showed similarly lower risk of heart attack (a 27% reduction for weekend warriors and 35% for regularly active people, compared with inactive participants).
For heart failure, weekend warriors had a 38% lower risk than inactive people, while regular exercisers had a 36% lower risk. Irregular heartbeat risk was 22% lower for weekend warriors and 19% lower for regularly actively people. Stroke was 21% and 17% lower for weekend warriors and regular exercisers, respectively.
Not so fast. Some study limitations
Although the information was recorded by activity trackers, researchers did not consider on which days of the week the activity was done. Some people may have been active on Saturdays and Sundays, others might have chosen Wednesday and Friday – or different days each week. In that sense, the study examined a “pseudo-weekend warrior” pattern.
Despite the many advantages the UK Biobank activity trackers have over questionnaire-based studies, these trackers are not great at capturing strength-training exercise, such as weights or pilates, and other static activities that have established cardiovascular health benefits.
What other research in this area says
There have been several questionnaire based studies in this area in the past 20 years.
Our 2017 study, for example, combined data from 63,591 adults from England and Scotland and tracked them over 12 years. We looked at risk reductions for death from any cause, cardiovascular disease and cancer causes. We found similar benefits among people who clocked at least 150 minutes of moderate-intensity physical activity or at least 75 minutes of vigorous-intensity physical activity in one to two sessions per week, compared with three sessions or more per week.
Our more recent studies used activity trackers and emphasised the flexibility of activity patterns that benefit the heart and circulation. We found doing short one-minute-long bouts of incidental vigorous physical activity three to four times a day can cut the risk of death from cardiovascular causes by almost half.
Similarly, in another study we found just 19 minutes of vigorous physical activity a week was associated with 40% reduction in the risk of cardiovascular death, with steadily increasing benefits to the maximum amount of vigorous activity recorded (110 minutes a week linked to a 75% risk reduction).
What it means for you and your routine
Taken together, the new study and previous research suggest the same thing: if it is difficult to find time to be active during a busy week, it is good enough to plan moderate to vigorous physical activities in a couple of weekdays or in the weekend.
That said, there are benefits in being regularly physically active on most days of the week. A good session of aerobic exercise, for example, improves health indicators such as blood pressure, and blood glucose and cholesterol levels for a day or longer. Such effects can moderate some of the long-term health risks of these factors and assist with their day-to-day management.
But confirmation that we can be flexible about how physical activity is accumulated across the week for heart health benefits is encouraging. It offers more opportunities for more people to be active when it is convenient and practical for them.
The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.
