The impact of different resistance exercise intensities and postures on blood pressure and cardiac autonomic function
Poster Presentation
Paper ID : 1154-SSRC
Authors
1Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran
2Department of Exercise Physiology, Faculty of Humanities and Social Sciences, University of Kurdistan, Sanandaj, Kurdistan, Iran
3Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran
Abstract
Background: Understanding how different body postures can affect blood pressure regulation is crucial for tailoring exercise prescriptions based on post-exercise hypotension responses. This study aimed to evaluate the impact of acute resistance exercise (RE) performed in two different body postures and varying intensities on cardiac autonomic function and blood pressure regulation.
Method: Ten normotensive men (age 26.6 ± 1.07 y; weight 89.83 ± 5.08 kg; height 182.9 ± 5.06 cm; BMI 26.83 ± 1.53 kg/m2) participated in the study. Each participant completed six experimental trials involving different intensity levels, with maximum repetition (RM) counts of 5, 10, and 15. Measurements of blood pressure, heart rate variability (HRV), and rate pressure product (RPP) were taken before, immediately after, and 30 minutes following each experimental session.
Results: Compared to leg press (LP), systolic blood pressure and heart rate variability (HRV) significantly differed in the 15RM squat (SQ) exercise (p˂0.05). RPP was significantly higher in SQ 15RM compared with LP (p˂0.05). Inter-group comparison showed higher normalized units of low frequency (nLF) in post-10 and post-20 for 5RM in SQ. There was no statistically significant difference between 10RM and 15RM for nLF. Moreover, SQ and LP showed significant differences in root mean square of successive R-R differences (RMMSD) and normalized units of high frequency (nHF) at 20 minutes after the 5RM trials, as well as in all RMs compared with pre- and post-values in nHF (p˂0.05).
Conclusion: The present study confirms that RE's posture can play a significant role in the modulation of BP.
Method: Ten normotensive men (age 26.6 ± 1.07 y; weight 89.83 ± 5.08 kg; height 182.9 ± 5.06 cm; BMI 26.83 ± 1.53 kg/m2) participated in the study. Each participant completed six experimental trials involving different intensity levels, with maximum repetition (RM) counts of 5, 10, and 15. Measurements of blood pressure, heart rate variability (HRV), and rate pressure product (RPP) were taken before, immediately after, and 30 minutes following each experimental session.
Results: Compared to leg press (LP), systolic blood pressure and heart rate variability (HRV) significantly differed in the 15RM squat (SQ) exercise (p˂0.05). RPP was significantly higher in SQ 15RM compared with LP (p˂0.05). Inter-group comparison showed higher normalized units of low frequency (nLF) in post-10 and post-20 for 5RM in SQ. There was no statistically significant difference between 10RM and 15RM for nLF. Moreover, SQ and LP showed significant differences in root mean square of successive R-R differences (RMMSD) and normalized units of high frequency (nHF) at 20 minutes after the 5RM trials, as well as in all RMs compared with pre- and post-values in nHF (p˂0.05).
Conclusion: The present study confirms that RE's posture can play a significant role in the modulation of BP.
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