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Spontaneous cardiac baroreflex sensitivity is enhanced during post-exercise ischemia in men but not in women.

Abstract：

PURPOSE:To investigate the effect of isolated muscle metaboreflex activation on spontaneous cardiac baroreflex sensitivity (cBRS), and to characterize the potential sex-related differences in this interaction in young healthy subjects. METHODS:40 volunteers (20 men and 20 women, age: 22 ± 0.4 year) were recruited. After 5-min rest period, the subjects performed 90 s of isometric handgrip exercise at 40% of maximal voluntary contraction followed by 3 min of post-exercise ischemia (PEI). Beat-to-beat heart rate and arterial blood pressure were continuously measured by finger photopletysmography. Spontaneous cBRS was assessed using the sequence technique and heart rate variability was measured in time (RMSSD-standard deviation of the RR intervals) and frequency domains (LF-low and HF-high frequency power). RESULTS:Resting cBRS was similar between men and women. During PEI, cBRS was increased in men (Δ3.0 ± 1.1 ms mmHg- 1, P = 0.03) but was unchanged in women (Δ-0.04 ± 1.0 ms mmHg- 1, P = 0.97). In addition, RMSSD and HF power of heart rate variability increased in women (Δ7.4 ± 2.6 ms, P = 0.02; Δ373.4 ± 197.3 ms2; P = 0.04, respectively) and further increased in men (Δ26.4 ± 7.1 ms, P < 0.01; Δ1874.9 ± 756.2 ms2; P = 0.02, respectively). Arterial blood pressure increased from rest during handgrip exercise and remained elevated during PEI in both groups, however, these responses were attenuated in women. CONCLUSIONS:These findings allow us to suggest a sex-related difference in spontaneous cBRS elicited by isolated muscle metaboreflex activation in healthy humans.

journal_name

Eur J Appl Physiol

journal_title

European journal of applied physiology

authors

Samora M,Teixeira AL,Sabino-Carvalho JL,Vianna LC

doi

10.1007/s00421-018-4004-y

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

103-111

issue

1

eissn

1439-6319

issn

1439-6327

pii

10.1007/s00421-018-4004-y

journal_volume

119

pub_type

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