Physical activity plays a vital role in promoting longevity and reducing mortality risk. However, the relative importance of intensity versus volume in determining health outcomes has been a subject of ongoing debate (1^✔ ✔Trusted Source
Intensity or volume: the role of physical activity in longevity

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The study analyzed physical activity patterns and their association with mortality risk. Data were collected over an 81-month follow-up for all-cause mortality and an 82-month follow-up for cardiovascular disease mortality, covering a large sample size.

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Curvilinear Inverse Dose-Response Relationships

The study found curvilinear inverse dose-response relationships for both all-cause mortality and cardiovascular disease mortality risk when considering physical activity patterns. These relationships are described in the following subsections.

All-Cause Mortality Risk

• There was a 14.4% reduction in all-cause mortality risk (95% CI: -8.3% to -20.1%) when moving from the 25th to 50th percentile of AvAcc (Average physical activity accumulated across the day).
• For IG (Intensity Gradient, a measure of the intensity of physical activity), the risk reduction was much larger, at 37.1% (95% CI: -30.0% to -43.4%) from the 25th to 50th percentile.

Cardiovascular Disease Mortality Risk

Interestingly, the risk reduction for cardiovascular disease mortality was significant only for IG, showing a 41.0% reduction (95% CI: -26.7% to -52.4%) from the 25th to 50th percentile. There was no substantial effect observed for AvAcc in this case.

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Plateau Points for Intensity and Volume

The risk reduction for both all-cause and cardiovascular disease mortality plateaued at specific activity levels:

• AvAcc: 35-45 mg of accumulated activity
• IG: Between -2.7 to -2.5

This finding suggests that exceeding these activity levels does not further reduce mortality risk significantly.

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Intensity vs. Volume in Reducing Mortality Risk

The study concluded that intensity of physical activity is the primary factor associated with reduced mortality risk. Although the overall volume of physical activity (AvAcc) does play a role, it is secondary to the impact of intensity (IG), particularly when it comes to cardiovascular disease mortality.

All-Cause Mortality: Both intensity and volume contribute to reducing all-cause mortality risk, but intensity remains a stronger determinant.

Cardiovascular Disease Mortality: Intensity is the main driver for reducing cardiovascular disease mortality risk, with little to no effect from volume alone.

To provide practical guidance, the study generated centile curves for both physical activity volume and intensity. These curves serve as tools to help individuals and healthcare professionals determine the most effective physical activity levels for promoting longevity.

Importance of Continuous Bouts of Intense Physical Activity

One of the most significant findings of the study is that accumulating physical activity in continuous bouts of higher intensity yields better health outcomes than sporadic, low-intensity activity throughout the day. This emphasizes the need to incorporate bursts of intense exercise into daily routines for optimal health benefits.

The study highlights that the intensity of physical activity is a more critical factor for reducing mortality risk than the overall volume, particularly in relation to cardiovascular disease mortality.

While accumulating physical activity throughout the day is beneficial, the focus should be on integrating higher-intensity activities to achieve the best health outcomes and longevity. The centile curves created from the study provide a valuable framework for setting realistic and beneficial physical activity targets.

Reference:

1. Intensity or volume: the role of physical activity in longevity – (https://pubmed.ncbi.nlm.nih.gov/39276370/)

Source-Medindia