Researchers have examined psychosocial risk variables (e.g., hostility) related to high resting blood pressure (BP), with the majority of findings suggesting that hostility is associated with increased resting BP. Additionally, it has been proposed that constructive verbal anger expression is a protective factor for hypertension (Davidson, MacGregor, Stuhr, Dixon, & MacLean, 2000; Davidson, MacGregor, Stuhr, & Gidron, 1999), while others have hypothesized that humor promotes physical health (i.e., the humor-health hypothesis) (Martin, Puhlik-Doris, Larsen, Gray, & Weir, 2003; McClelland & Cheriff, 1997). The primary purpose of the present study is to examine the relations between hostility, humor styles, constructive verbal anger, and resting BP, with an emphasis on the humor-health hypothesis. One hundred and ninety nine undergraduate university participants had six resting blood pressure measurements taken at three-minute intervals. Participants then completed the following questionnaires online in a randomized order: Cook-Medley Hostility Scale (CMH), Constructive Anger Behaviour-Verbal Scale (CAV), Humor Styles Questionnaire (HSQ), and a health and demographic questionnaire. A series of hierarchical regressions were conducted to test the hypotheses with resting systolic BP (SBP) and resting diastolic BP (DBP). Two health and demographic variables, age and body mass index (BMI), were entered into step 1 of all the regressions analyzed as covariates. In step 2 of each regression model, the respective psychosocial variables were independently entered. Comparisons were conducted between the various psychosocial variables entered into step 2 to determine which variable accounts for the most unique variance in resting SBP and DBP. Small to moderate positive correlations were observed between age and resting BP, as well as BMI and resting BP. Regarding psychosocial variables, small positive correlations were observed between affiliative humor and resting SBP, and between self-enhancing humor and resting BP. Multiple regression analyses revealed that after controlling for age and BMI, adaptive humor styles uniquely predicted higher resting SBP, while no psychosocial variables predicted resting DBP. The present investigation provides evidence suggesting that psychosocial risk factors are not associated with resting BP while also contradicting the humor-health hypothesis, suggesting that adaptive humor is associated with increased resting BP.

<p> Hypertension and reduced arterial distensibility are independent risk factors for cardiovascular disease. Previous research has found that isometric training reduces resting blood pressure (RBP) (Wiley et al. 1992; Taylor et al. 2003) yet the mechanisms responsible remain elusive. Improved arterial distensibility may contribute to this reduction in RBP. The purpose of the present study was threefold: 1) to replicate the RBP lowering effect of isometric handgrip (IHG) exercise; 2) to compare IHG and isometric leg press (ILP) based in their RBP lowering effects; and 3) to determine if central or peripheral arterial distensibility improved with IHG or ILP. The population examined was people whom were medicated for hypertension.</p> <p> RBP, as assessed by brachial oscillometry, and arterial distensibility, as assessed by Doppler ultrasound and applanation tonometry in the carotid, brachial and femoral arteries, were measured pre training, after 4 weeks of training, and post training. Participants performed unilateral IHG exercise (n=10) or ILP exercise (n=9) 3 times/week for 8 weeks at 30% MVC or acted as a non-exercising control group (n=5).</p> <p> Results indicated that the present study was unable to reproduce the RBP reductions noted in previous studies using IHG exercise. Also, the ILP exercise group did not experience reductions in RBP. Finally, neither central nor peripheral arterial distensibility improved in the IHG or ILP group when compared to the control group.</p> <p> Although these findings are contrary to our hypotheses one must consider that the control group examined contained very few subjects. This may have limited our ability to detect statistically significant changes in RBP and arterial distensibility.</p> / Thesis / Master of Science (MSc)

This study examined the effects of isometric handgrip (IHG) training on resting blood pressure (RBP), heart rate variability (HRV) and blood pressure variability (BPV) in older adults with hypertension. Nine subjects performed four 2-minute IHG contractions at 30% maximal voluntary contraction (MVC) 3 days/week for 10 weeks and 8 subjects served as controls. Power spectral analysis (PSA) of HRV and BPV was used to assess changes in modulation of the autonomic nervous system. After training, there was a marked attenuation in arterial pressure and evidence for a shift in HR.V and BPV sympathovagal balance. There was a reduction in systolic blood pressure (156 ± 9.4 to 137 ± 7.8 mm Hg; p<0.05), diastolic blood pressure (82 ± 9.3 to 75 ± 10.9 mm Hg; N.S), mean arterial pressure (107 ± 8.53 to 96 ± 8.7 mm Hg; p<0.05) and resting heart rate (RHR) (70 ± 14.2 to 68 ± 12.1 beats/min). In addition, PSA of HRV showed a decrease in sympathetic modulation represented by low frequency (LF) area, an increase in parasympathetic modulation represented by high frequency (HF) area (p<0.05) and a decrease in LF:HF area ratio. After training, BPV PSA showed a decrease in systolic blood pressure LF area (p<0.05), an increase in HF area (p<0.05) and decrease in LF:HF area (p<0.05). Similar, but non-significant changes occurred in diastolic BPV. It is concluded that isometric training at a moderate intensity can elicit a hypotensive response and can potentially alter sympathovagal balance of HRV and BPV in older adults with hypertension. / Thesis / Master of Science (MS)

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