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1 Section of Cardiology,
2 Department of Radiology, and
3 Biostatistics Section,
We compared
reflex responses to static handgrip at 30% maximal voluntary
contraction (MVC) in 10 women (mean age 24.1 ± 1.7 yr) during two
phases of their ovarian cycle: the menstrual phase (days 1-4) and the follicular
phase (days
10-12). Changes in muscle sympathetic nerve activity (MSNA; microneurography) in response to
static exercise were greater during the menstrual compared with
follicular phase (phase effect P = 0.01). Levels of estrogen were less during the menstrual phase
(75 ± 5.5 vs. 116 ± 9.6 pg/ml, days 1-4 vs.
days 10-12;
P = 0.002). Generated tension did not explain differences in MSNA responses (MVC: 29.3 ± 1.3 vs. 28.2 ± 1.5 kg, days 1-4 vs.
days 10-12;
P = 0.13). In a group of experiments with the use of 31P-NMR
spectroscopy, no phase effect was observed for
H+ and
H2PO
4 concentrations
(n = 5). During an ischemic
rhythmic handgrip paradigm (20% MVC), a phase effect was not
observed for MSNA or H+ or
H2PO4 concentrations,
suggesting that blood flow was necessary for the expression of the
cycle-related effect. The present studies suggest that, during static
handgrip exercise, MSNA is increased during the menstrual compared with
the follicular phase of the ovarian cycle.
sympathetic nerve activity; estrogen
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