The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis
OBJECTIVES Although the effect of physical activity (PA) on the incidence of atrial fibrillation (AF) has been studied, contradictory results have been reported. Such discrepancies may reflect the different effects of various types of PA upon AF, as well as gender interactions. Therefore, we aimed t...
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| Format: | Article |
| Language: | English |
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Korean Society of Epidemiology
2017-06-01
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| Series: | Epidemiology and Health |
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| Online Access: | http://www.e-epih.org/upload/pdf/epih-39-e2017024.pdf |
| _version_ | 1811334724731273216 |
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| author | Yaser Mokhayeri Seyed Saeed Hashemi-Nazari Mohammad Ali Mansournia Hamid Soori Soheila Khodakarim |
| author_facet | Yaser Mokhayeri Seyed Saeed Hashemi-Nazari Mohammad Ali Mansournia Hamid Soori Soheila Khodakarim |
| author_sort | Yaser Mokhayeri |
| collection | DOAJ |
| description | OBJECTIVES Although the effect of physical activity (PA) on the incidence of atrial fibrillation (AF) has been studied, contradictory results have been reported. Such discrepancies may reflect the different effects of various types of PA upon AF, as well as gender interactions. Therefore, we aimed to evaluate the associations of PA types (total, moderate/vigorous, and intentional), as well as walking pace, with AF risk in men and women. METHODS Using the Multi-Ethnic Study of Atherosclerosis Typical Week Physical Activity Survey, 3 PA measures and walking pace were calculated among 6,487 men and women aged 45-84 years. The incidence of AF over approximately 11 years of follow-up was ascertained. The association of each PA measure and walking pace with AF incidence was estimated using multivariable Cox proportional hazard models. An extended Cox model with Heaviside functions (hv) of time was used to estimate the effects of time-varying covariates. RESULTS During 11 years of follow-up (49,557 person-years), 242 new AF cases occurred. The incidence rate of AF was 48.83 per 10,000 person-years. The proportional hazard (PH) assumption for total PA among women was not met; hence, we used the hv to calculate the hazard ratio. Total PA in women in the hv2 analysis was negatively associated with AF in all 3 models, although for hv1 no significant association was observed. The PH assumption for walking pace among men was not met, and none of the hv showed a statistically significant association between walking pace and AF in men. CONCLUSIONS These results suggest that PA is inversely associated with AF in women. |
| first_indexed | 2024-04-13T17:12:30Z |
| format | Article |
| id | doaj.art-02f593c5a28348799a3db6ce411f80c2 |
| institution | Directory Open Access Journal |
| issn | 2092-7193 |
| language | English |
| last_indexed | 2024-04-13T17:12:30Z |
| publishDate | 2017-06-01 |
| publisher | Korean Society of Epidemiology |
| record_format | Article |
| series | Epidemiology and Health |
| spelling | doaj.art-02f593c5a28348799a3db6ce411f80c22022-12-22T02:38:13ZengKorean Society of EpidemiologyEpidemiology and Health2092-71932017-06-013910.4178/epih.e2017024912The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of AtherosclerosisYaser Mokhayeri0Seyed Saeed Hashemi-Nazari1Mohammad Ali Mansournia2Hamid Soori3Soheila Khodakarim4 Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Safety Promotion and Injury Prevention Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, IranOBJECTIVES Although the effect of physical activity (PA) on the incidence of atrial fibrillation (AF) has been studied, contradictory results have been reported. Such discrepancies may reflect the different effects of various types of PA upon AF, as well as gender interactions. Therefore, we aimed to evaluate the associations of PA types (total, moderate/vigorous, and intentional), as well as walking pace, with AF risk in men and women. METHODS Using the Multi-Ethnic Study of Atherosclerosis Typical Week Physical Activity Survey, 3 PA measures and walking pace were calculated among 6,487 men and women aged 45-84 years. The incidence of AF over approximately 11 years of follow-up was ascertained. The association of each PA measure and walking pace with AF incidence was estimated using multivariable Cox proportional hazard models. An extended Cox model with Heaviside functions (hv) of time was used to estimate the effects of time-varying covariates. RESULTS During 11 years of follow-up (49,557 person-years), 242 new AF cases occurred. The incidence rate of AF was 48.83 per 10,000 person-years. The proportional hazard (PH) assumption for total PA among women was not met; hence, we used the hv to calculate the hazard ratio. Total PA in women in the hv2 analysis was negatively associated with AF in all 3 models, although for hv1 no significant association was observed. The PH assumption for walking pace among men was not met, and none of the hv showed a statistically significant association between walking pace and AF in men. CONCLUSIONS These results suggest that PA is inversely associated with AF in women.http://www.e-epih.org/upload/pdf/epih-39-e2017024.pdfExerciseAtrial fibrillationArrhythmiasWalking speed |
| spellingShingle | Yaser Mokhayeri Seyed Saeed Hashemi-Nazari Mohammad Ali Mansournia Hamid Soori Soheila Khodakarim The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis Epidemiology and Health Exercise Atrial fibrillation Arrhythmias Walking speed |
| title | The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis |
| title_full | The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis |
| title_fullStr | The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis |
| title_full_unstemmed | The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis |
| title_short | The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis |
| title_sort | association between physical activity and atrial fibrillation applying the heaviside function in survival analysis the multi ethnic study of atherosclerosis |
| topic | Exercise Atrial fibrillation Arrhythmias Walking speed |
| url | http://www.e-epih.org/upload/pdf/epih-39-e2017024.pdf |
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