Finally, the average differences in QT interval comparing the highest vs. the lowest categories of total and vigorous physical activity in the fully adjusted model were −0.8 (−3.0 to 1.4) and −0.3 ms (−2.9 to 2.4), respectively (Table 5).
In partial agreement with our results, Papathanasiou et al. [29] reported significant correlations between the total and vigorous physical activities (Greek version of IPAQ-short) and maximal treadmill time (assessed with Bruce's treadmill test) (0.35 to 0.43) in young health-science students (20 29 years old).
The association was most pronounced for total and vigorous activities.
We created four variables of updated physical activity, updated vigorous physical activity, cumulative average physical activity, and cumulative average vigorous activity based on data from total physical activity, vigorous physical activity, and cumulative average of total and vigorous physical activity, respectively.
For nondense volume, an inverse association was observed for total and vigorous activities across all categories of breast cancer risk (data not shown).
Among normal weight and lean women (BMI < 25.0 kg/m), the multivariate RRs comparing extreme categories of total and vigorous activity were 0.76 (95% CI = 0.61 to 0.94; p = 0.03) and 0.68 (95% CI = 0.54 to 0.85; p = 0.002), respectively.
The inverse association was seen for any type of physical activity among women with <3.0% TC 10-year risk, but only for total and vigorous activities among women with 3.0-4.9 3.0-4.9k, and only for vigorous activity among women with ≥5.0% TC risk.
In models stratified by the TC 10-year breast cancer risk (Table 4), an inverse association with absolute dense volume was seen for any type of activity among women with <3.0% TC risk, but only for total and vigorous activities among women with 3.0 to 4.9% TC risk, and only for vigorous activity among women with ≥5.0% TC risk.
An inverse association with absolute dense volume was seen for any type of activity among women with <3.0% TC 10-year risk of breast cancer, but only for total and vigorous activities among women with 3.0 to 4.9% TC risk and only for vigorous activity among women with ≥5.0% TC risk.
Univariate analyses were used to define quintiles of baseline physical activity (both total and moderate vigorous) and change in total and moderate vigorous physical activity from baseline to 1 year.
