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Background No prior study has measured or compared self‐reported and objectively measured physical activity trajectories in prostate cancer survivors before and after treatment. Methods Clinically localized prostate cancer patients treated with radical prostatectomy were recruited between 2011 and 2014. Of the 350 participants enrolled at the main site, 310 provided self‐reported physical activity at baseline before radical prostatectomy, and 5 weeks, 6 months, and 12 months after radical prostatectomy. A subset of participants (n = 81) provided objectively measured physical activity at all study time points by wearing an accelerometer for 7 days each. Changes in activity over time were compared using Friedman’s test. Agreement between self‐reported and objective measures was evaluated using Spearman’s rank correlation coefficient. Results Self‐reported moderate‐to‐vigorous physical activity was high at baseline (median, 32.1 min/day), followed by a decline at 5 weeks (median, 15.0 min/day) and a recovery at 6 and 12 months (median, 32.1‐47.1 min/day). In contrast, objectively measured moderate‐to‐vigorous physical activity was low at all 4 time points (median, 0.0‐5.2 min/day), with no overall change across study assessments (global P = .29). Self‐reported moderate‐to‐vigorous physical activity tended to be more closely related to objectively measured light‐intensity physical activity (ρ = 0.29‐0.42) than to objectively measured moderate‐to‐vigorous physical activity (ρ = 0.07‐0.27, P = .009‐.32). Conclusions In our population of prostate cancer survivors with critically low moderate‐to‐vigorous physical activity levels, self‐reported measures greatly overestimated moderate‐to‐vigorous physical activity and may have been more reflective of light‐intensity physical activity. Because cancer survivor guidelines are derived from self‐reported data, our findings may imply that intensities of physical activity below moderate, such as light intensity, still have health benefits.

This finding suggests that avoiding SB may be beneficial for lowering the risk of obesity in adults.

Purpose:The main purpose of this study was to compare the relationships between physical activity (measured using an accelerometer vs. self-reported) and cardiovascular disease risk factors. Differences in accelerometry physical activity between 10-minute bouts and total bouts were also compared. Methods: Data originated from the Korea National Health and Nutrition Examination Survey. Logistic regression was used to predict cardiovascular disease risk from physical activity levels. Results: Self-reported physical activity could not significantly predict the odds of having cardiovascular risk. However, the insufficiently active group classified according to the total-bout physical activity had significantly greater odds of having hypertension or prehypertension (odds ratio [OR], 1.35; 95% confidence interval [95% CI], 1.00-1.82), diabetes mellitus (OR, 1.77; 95% CI, 1.01-3.19), and dyslipidemia (OR, 1.65; 95% CI, 1.17-2.36) than the highly active group. Regarding the 10-minute bout physical activity, the inactive group had significantly greater odds of having only hypertension or prehypertension (OR, 1.67; 95% CI, 1.02-2.76) than the highly active group. Conclusion: Total-bout physical activity measured using an accelerometer could significantly predict the cardiovascular disease risk compared to 10-minute bout physical activity. However, self-reported physical activity could not significantly predict the cardiovascular disease risk.

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