Isotemporal Associations of Device-Measured Sedentary Time and Physical Activity with Cardiac-Autonomic Regulation in Previously Pregnant Women
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8 2023
Source: Int J Behav Med. 30(4):497-508
Details:
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Alternative Title:Int J Behav Med
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Personal Author:
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Description:Background:
High sedentary time (ST) and low physical activity may increase cardiovascular risk, potentially though cardiac-autonomic dysregulation. This study investigated associations of statistically exchanging device-measured ST and physical activity with measures of cardiac-autonomic regulation in previously pregnant women.
Methods:
This cross-sectional, secondary analysis included 286 women (age=32.6±5.7 yrs; 68% white) measured 7-15 years after delivery. ST and light (LPA), moderate (MPA), vigorous (VPA), and moderate-to-vigorous (MVPA) intensity physical activity were measured by ActiGraph GT3X. ST was further partitioned into long (≥30 minutes) and short (<30 minutes) bouts. MVPA was also partitioned into long (≥10-minute) and short (<10-minute) bouts. Cardiac-autonomic regulation was assessed by heart rate variability (HRV) (resting heart rate, natural log transformed standard deviation of normal R-R intervals [lnSDNN], natural log-transformed root mean square of successive differences [lnRMSSD]) from a 5-minute seated ECG. Progressive isotemporal substitution models adjusted for confounders. Sensitivity analyses removed women with related underlying medical conditions and who did not meet respiration rate criteria.
Results:
Initial analyses found no significant associations with HRV when exchanging 30 minutes of ST and physical activity (p>0.05). Yet, replacing long- and short-bout ST with 30 minutes of long-bout MVPA yielded significantly higher (healthier) lnRMSSD (B=0.063±0.030 and B=0.056±0.027, respectively; both p<0.05). Sensitivity analyses strengthened these associations and yielded further associations of higher lnSDNN and lnRMSSD when replacing 30 minutes of short-bout MVPA with equivalent amounts of long-bout MVPA (B=0.074±0.037 and B=0.091±0.046, respectively).
Conclusion:
Replacing ST with long-bout MVPA is a potential strategy to improve cardiac-autonomic function in previously pregnant women.
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Source:
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Pubmed ID:35819720
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Pubmed Central ID:PMC9832172
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