Madison Colson, Matthew D. Ruiz, Ruth N. Henry, Laurel A. Littlefield. Lipscomb University, Cookeville, TN.

BACKGROUND: Post-exercise hypotension (PEH) has been documented following acute resistance training sessions that range from approximately 40 - 80% of the 1-repetition maximum (1 RM). Most authors report statistically significant reductions in systolic blood pressure (SBP), with more varied results related to diastolic blood pressure (DBP). The purpose of this study was to determine the effect of acute isovolumetric resistance training sessions at 40% and 80% 1RM on post-exercise blood pressure in a group of healthy participants from a local community fitness facility. METHODS: Twelve individuals (Age = 23 ± 5 years; BMI = 27.9 + 6.8 kg/m2; SBP = 121 + 8 mmHg; DBP = 69 + 7 mmHg) completed 1 RM testing following ACSM’s guidelines prior to completing 3 experimental sessions: non-exercise control, exercise at 40% 1RM, and exercise at 80% 1RM. Exercise conditions were matched for volume and included 7 exercises that were completed using resistance machines (Matrix, Cottage Grove, WI). Blood pressure and heart rate (HR) were measured pre-exercise and every 15 minutes post-exercise for 1-hour (Greater Goods, Balance, USA). Dependent variables were analyzed using 3x4 factorial ANOVAs with repeated measures. Tukey post-hoc testing was used to determine differences between individual group means. Alpha was set at 0.05. RESULTS: DBP (p = 0.01) and MAP (p < 0.01) were lower and HR (p = 0.01) higher following both exercise conditions when compared to non-exercise control. In addition, there were statistically significant main effects for time for SBP (p = 0.03), DBP (p < 0.01), MAP (p < 0.01), and HR (p < 0.01). SBP was lower at 30 when compared to 60 minutes, while DBP was lower at 15 when compared to 45 and 60 minutes. MAP was reduced at 15 and 30 compared to 60 minutes, and HR was higher at 15 when compared to 30, 45, and 60 minutes, and at 30 when compared to 45 and 60 minutes. CONCLUSIONS: Contrary to other studies, we report no main effect for SBP following acute resistance exercise. Blood pressure was lower at 15 and/or 30 when compared to 60 minutes following exercise. Acute resistance exercise at both 40 and 80% of 1 RM is effective at lowering DBP and MAP in the hour following exercise despite maintained elevations in heart rate.

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