Accumulation of physical activity: Blood pressure reduction between 10-min walking sessions

Division of Sports Science, Korea Institute of Sport Science, Seoul, Korea.
Journal of Human Hypertension (Impact Factor: 2.7). 08/2008; 22(7):475-82. DOI: 10.1038/jhh.2008.29
Source: PubMed


The accumulation of intermittent bouts of physical activity (PA) has been found to reduce blood pressure (BP) in prehypertension and hypertension. Yet, the BP response among several short sessions within the accumulation of PA in a single day has not been examined. The purpose of the study was (1) to investigate the BP reduction during the rest periods following three successive 10-min walking sessions accumulated over a 3-h period in prehypertensive adults and (2) to observe the role of autonomic modulation during the rest periods following each short PA session. Adults with prehypertension (131.9+/-4.7/82.5+/-6.4 mm Hg) participated in the study. BP using ambulatory monitoring and autonomic modulation through heart rate variability (HRV) using Holter monitoring were measured at baseline and during the rest periods following three short sessions (three 10-min treadmill walks at 50% of peak oxygen uptake (VO2peak); at least 50 min apart) over a 3-h period. Variables of BP and autonomic modulation were averaged for the baseline and for the rest periods following each 10-min walk. One-way analysis of variance with repeated measures was used to test the differences over time in BP and HRV (P<0.05). A significant main effect was found in systolic BP (P=0.039), whereas none was found in diastolic BP (P=0.630). Systolic BP was decreased following the third short session (-4.0+/-7.4 mm Hg) compared to baseline. No significance was found in any of the autonomic modulation variables. In conclusion, accumulating intermittent bouts of PA, as short as 10 min, total 30-min walk sessions may reduce systolic BP in prehypertension.

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    • "Hence, changes in autonomic activity and balance seem to influence the blood pressure after exercise and are regarded as having an essential role in the occurrence of PEH (Chandler et al. 1998; Teixeira et al. 2011). However, evidence about the role of autonomic activity in PEH is controversial, with some studies claiming that there would be a decrease in sympathetic activity and increase in parasympathetic activity concomitant to PEH (Park et al. 2008), while others suggest that a compensatory increase in sympathetic activity would occur to offset the blood pressure reduction (Piepoli et al. 1993; Teixeira et al. 2011). The extent to which these physiological responses are correlated with PEH after different exercise modes are aspects that remain unclear , warranting additional investigation. "
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    ABSTRACT: This study investigated postexercise hypotension (PEH) after maximal cardiopulmonary exercise testing (CPET) performed using different exercise modalities. Twenty healthy men (aged 23±3 yr) performed three maximal CPETs (cycling, walking, and running), separated by 72 h in a randomized, counter-balanced order. Systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), cardiac output (Q), systemic vascular resistance (SVR), autonomic function [spontaneous baroreflex sensitivity (BRS) and heart rate variability (HRV)], and energy expenditure (EE) were assessed during a 60 min non-exercise control session and for 60 min immediately after each CPET. Total exercise volume (EE during CPET plus 60 min recovery) was significantly higher in running vs. cycling and walking CPETs (P≤0.001). Compared to control, only SBP after running CPET was significantly reduced (Δ = -6±8 mmHg; P<0.001). HR and Q were significantly increased (P<0.001) and SVR significantly decreased (P<0.001) postexercise. BRS and HRV decreased after all CPETs (P<0.001), whereas sympatho-vagal balance (LF:HF ratio) increased significantly after all exercise conditions, especially after running CPET (P<0.001). Changes in SVR, BRS, sympathetic activity (low frequency component of HRV), and LF:HF ratio were negatively correlated to variations in SBP (range -0.69 to -0.91; P<0.001) and DBP (range -0.58 to -0.93; P≤0.002). These findings suggest that exercise mode or the total exercise volume, are major determinants of PEH magnitude in healthy men. The PEH due to running CPET was primarily related to a decrease in SVR and to an increase in sympatho-vagal balance, which might be a reflex response to peripheral vasodilatation after exercise.
    Applied Physiology Nutrition and Metabolism 02/2015; 40(6). DOI:10.1139/apnm-2014-0354 · 2.34 Impact Factor
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    • "Regular leisure-time physical activity (LTPA) has been linked to numerous health benefits, including decreased prevalence of coronary heart disease [1], stroke [2], high blood pressure [3], depression symptoms [4], all-cause mortality [5], and other harmful conditions [5,6]. For this reason, various demographic, psychological - and more recently, environmental and social - factors have been investigated as potential determinants of engagement in and maintenance of LTPA [7-9]. "
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    ABSTRACT: Although social support has been observed to exert a beneficial influence on leisure-time physical activity (LTPA), multidimensional approaches examining social support and prospective evidence of its importance are scarce. The purpose of this study was to investigate how four dimensions of social support affect LTPA engagement, maintenance, type, and time spent by adults during a two-year follow-up. This paper reports on a longitudinal study of 3,253 non-faculty public employees at a university in Rio de Janeiro (the Pró-Saúde study). LTPA was evaluated using a dichotomous question with a two-week reference period, and further questions concerning LTPA type (individual or group) and time spent on the activity. Social support was measured by the Medical Outcomes Study Social Support Scale (MOS-SSS). To assess the association between social support and LTPA, two different statistical models were used: binary and multinomial logistic regression models for dichotomous and polytomous outcomes, respectively. Models were adjusted separately for those who began LTPA in the middle of the follow up (engagement group) and for those who had maintained LTPA since the beginning of the follow up (maintenance group). After adjusting for confounders, statistically significant associations (p < 0.05) between dimensions of social support and group LTPA were found in the engagement group. Also, the emotional/information dimension was associated with time spent on LTPA (OR = 2.01; 95% CI 1.2-3.9). In the maintenance group, material support was associated with group LTPA (OR = 1.80; 95% CI; 1.1-3.1) and the positive social interaction dimension was associated with time spent on LTPA (OR = 1.65; 95% CI; 1.1-2.7). All dimensions of social support influenced LTPA type or the time spent on the activity. However, our findings suggest that social support is more important in engagement than in maintenance. This finding is important, because it suggests that maintenance of LTPA must be associated with other factors beyond the individual's level of social support, such as a suitable environment and social/health policies directed towards the practice of LTPA.
    International Journal of Behavioral Nutrition and Physical Activity 07/2011; 8(1):77. DOI:10.1186/1479-5868-8-77 · 4.11 Impact Factor
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