Key result
Long-term, high-frequency resistance training in young men was associated with significantly lower cardiovagal baroreflex sensitivity (9.0 vs. 12.9 ms/mmHg, P < 0.01) and greater central arterial stiffness compared to untrained controls.
Why the study?
Resistance-trained men who have undergone long-duration, high-frequency training may have lower cardiovagal baroreflex sensitivity due to central arterial stiffening compared with untrained men.
Does long-term, high-frequency resistance training reduce cardiovagal baroreflex sensitivity due to central arterial stiffening in healthy men?
Cross-Sectional (n=40)
No
Does long-term, high-frequency resistance training reduce cardiovagal baroreflex sensitivity due to central arterial stiffening in healthy men?
Absolute Event Rate: 9% vs 12.9%
p-value: p=<0.01
Long-term, high-frequency resistance training in young men is associated with greater central arterial stiffness and lower cardiovagal baroreflex sensitivity compared to untrained controls.
Should not yet change practice in young men; leaves open whether resistance training causally impairs baroreflex sensitivity via arterial stiffening.
BACKGROUND: Compared with age-matched untrained men, resistance-trained men who have undergone long duration training (> 2 years) at a high frequency (> 5 days/week) may be lower cardiovagal baroreflex sensitivity (BRS) because of central arterial stiffening. Therefore, the purpose of this study was to examine the effect of greater central arterial stiffness in resistance-trained men on cardiovagal BRS in a cross-sectional study to compare resistance-trained men with age-matched untrained men. METHODS: This cross-sectional study included resistance-trained men (n = 20; age: 22 ± 3; body mass index: 26.7 ± 2.2) and age-matched untrained men (control group: n = 20; age: 25 ± 2; body mass index: 23.7 ± 2.4). The β-stiffness index and arterial compliance were assessed at the right carotid artery using a combination of a brightness mode ultrasonography system for the carotid artery diameter and applanation tonometry for the carotid blood pressure. And, the cardiovagal BRS was estimated by the slope of the R-R interval and systolic blood pressure during Phase II and IV of Valsalva maneuver (VM). The participants maintained an expiratory mouth pressure of 40 mmHg for 15 s in the supine position. RESULTS: /mmHg, P < 0.01) and cardiovagal BRS during Phase IV of VM (9.0 ± 2.5 vs. 12.9 ± 5.4 ms/mmHg, P < 0.01) than the control group and. Moreover, cardiovagal BRS during Phase IV of VM was inversely and positively correlated with the β-stiffness index (r = - 0.59, P < 0.01) and arterial compliance (r = 0.64, P < 0.01), respectively. CONCLUSION: Resistance-trained group had greater central arterial stiffness and lower cardiovagal BRS Phase IV compared with control group. Moreover, the central arterial stiffening was related to cardiovagal BRS Phase IV. These results suggest that greater central arterial stiffness in resistance-trained men may be associated with lower cardiovagal BRS. Trial Registration University hospital Medical Information Network (UMIN) in Japan, UMIN000038116. Registered on September 27, 2019.
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Nakamura et al. (2021) conducted a cross-sectional in Healthy men (n=40). Long-term, high-frequency resistance training vs. Untrained controls was evaluated on Cardiovagal baroreflex sensitivity during Phase IV of the Valsalva maneuver (ms/mmHg) (p=<0.01). Long-term, high-frequency resistance training in young men was associated with significantly lower cardiovagal baroreflex sensitivity (9.0 vs. 12.9 ms/mmHg, P < 0.01) and greater central arterial stiffness compared to untrained controls.
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