Are there sex differences in visceral sensitivity in young healthy men and women?

It is currently unknown whether sex differences exist in the cardiovascular consequences of the inspiratory muscle metaboreflex. We hypothesized that the activation of the inspiratory muscle metaboreflex will lead to less of an increase in mean arterial pressure (MAP) and limb vascular resistance (LVR) and less of a decrease in limb blood flow (Q̇L) in women compared with men. Twenty healthy men ( n = 10, 23 ± 2 yr) and women ( n = 10, 22 ± 3 yr) were recruited for this study. Subjects performed inspiratory resistive breathing tasks (IRBTs) at 2% or 65% of their maximal inspiratory mouth pressure (PIMAX). During the IRBTs, the breathing frequency was 20 breaths/min with a 50% duty cycle. At rest and during the IRBTs, MAP was measured via automated oscillometry, Q̇L was measured via Doppler ultrasound, and LVR was calculated. EMG was recorded on the leg to ensure no muscle contraction occurred. The 65% IRBT led to attenuated increases ( P < 0.01) from baseline in women compared with men for MAP (W: 7.3 ± 2.0 mmHg; M: 11.1 ± 5.0 mmHg) and LVR (W: 17.7% ± 14.0%; M: 47.9 ± 21.0%), as well as less of a decrease ( P < 0.01) in Q̇L (W: −7.5 ± 9.9%; M: −23.3 ± 10.2%). These sex differences in MAP, Q̇L, and LVR were still present in a subset of subjects matched for PIMAX. The 2% IRBT resulted in no significant changes in MAP, Q̇L, or LVR across time or between men and women. These data indicate premenopausal women exhibit an attenuated inspiratory muscle metaboreflex compared with age-matched men.

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Threshold of airway response to inhaled methacholine in healthy men and women

Journal of Applied Physiology ◽

10.1152/jappl.1984.56.1.129 ◽

1984 ◽

Vol 56 (1) ◽

pp. 129-132 ◽

Cited By ~ 13

Author(s):

N. Zamel

Keyword(s):

Sex Differences ◽

Age Distribution ◽

Flow Volume ◽

Men And Women ◽

Healthy Men ◽

Doubling Dose ◽

Full Inspiration ◽

Airway Response

Threshold of airway response to inhaled methacholine was determined using maximum expiratory partial flow-volume curves in 21 men and 36 women with similar age distribution, all of them healthy nonsmokers. Mean threshold was on average 1.3 doubling dose lower in women than men. There were no sex differences in the increase of maximum expiratory flows after a full inspiration when the airways were constricted by methacholine.

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Directional sensitivity of the cerebral pressure-flow relationship in middle and posterior cerebral arteries using the repeated squat-stand model: within-day reproducibility and impact of diurnal variation in young healthy men and women

10.1101/2021.07.30.454396 ◽

2021 ◽

Author(s):

Lawrence Labrecque ◽

Joel S. Burma ◽

Marc-Antoine Roy ◽

Jonathan D. Smirl ◽

Patrice Brassard

Keyword(s):

Sex Differences ◽

Diurnal Variation ◽

Cerebral Arteries ◽

Intraclass Correlation ◽

Time Of Day ◽

Directional Sensitivity ◽

Pressure Flow ◽

Men And Women ◽

Healthy Men ◽

Time Points

We recently employed repeated squat-stands (RSS) to quantify directional sensitivity of the cerebral-pressure flow relationship (i.e. hysteresis) using a novel metric. Within-day reproducibility and diurnal variation impacts of this metric are unknown. We evaluated this metric for: 1) within-day reproducibility and the extent diurnal variation has in middle (MCA; ∆MCAvT/∆MAPT) and posterior cerebral arteries (PCA; ∆PCAvT/∆MAPT); 2) sex differences. Absolute (∆MCAvT/∆MAPT ; ∆PCAvT/∆MAPT) and relative (%MCAvT/%MAPT, %PCAvT/%MAPT) metrics were calculated at seven time-points (08:00-17:00) in 18 participants (8 women; 24 ± 3 yrs) using the minimum-to-maximum MCAv/PCAv and MAP for each RSS at 0.05 Hz and 0.10 Hz. Reproducibility was evaluated with intraclass correlation coefficient (ICC). For all metrics, reproducibility was good (0.75-0.90) to excellent (>0.90). The metric in both arteries was impacted by MAP direction at 0.10 Hz (all p < 0.024). Time-of-day influenced ∆MCAvT/∆MAPT (0.05 Hz: p = 0.0028; 0.10 Hz: p = 0.0009), %MCAvT/%MAPT (0.05 Hz: p = 0.035; 0.10 Hz: p = 0.0087), and ∆PCAvT/∆MAPT (0.05 Hz: p = 0.0236). Sex differences in the MCA (p = 0.0028) vanished in relative terms and was absent in the PCA. These findings demonstrate within-day reproducibility of this metric in both arteries. Moreover, hysteresis is not impacted by sex.

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SEX DIFFERENCES BETWEEN HEALTHY MEN AND WOMEN IN PITUITARY LH-RESPONSE TO MULTIPLE STIMULATIONS WITH SYNTHETIC LH-RH

Acta Endocrinologica ◽

10.1530/acta.0.080s022 ◽

1975 ◽

Vol 80 (1_Suppla) ◽

pp. S22

Author(s):

A. Römmler ◽

S. Baumgarten ◽

J. Hammerstein

Keyword(s):

Sex Differences ◽

Men And Women ◽

Healthy Men ◽

Lh Rh

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Sex Differences in Cardiovascular Reactivity

Journal of Psychophysiology ◽

10.1027/0269-8803.23.2.77 ◽

2009 ◽

Vol 23 (2) ◽

pp. 77-84 ◽

Cited By ~ 11

Author(s):

Matthew C. Whited ◽

Kevin T. Larkin

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Sex Differences ◽

Gender Roles ◽

Cardiovascular Reactivity ◽

Task Type ◽

Conflict Task ◽

Men And Women ◽

Conflicting Evidence ◽

Blood Pressure Responses

Sex differences in cardiovascular reactivity to stress are well documented, with some studies showing women having greater heart rate responses than men, and men having greater blood pressure responses than women, while other studies show conflicting evidence. Few studies have attended to the gender relevance of tasks employed in these studies. This study investigated cardiovascular reactivity to two interpersonal stressors consistent with different gender roles to determine whether response differences exist between men and women. A total of 26 men and 31 women were assigned to either a traditional male-oriented task that involved interpersonal conflict (Conflict Task) or a traditional female-oriented task that involved comforting another person (Comfort Task). Results demonstrated that women exhibited greater heart rate reactions than men independent of the task type, and that men did not display a higher reactivity than women on any measure. These findings indicate that sex of participant was more important than gender relevance of the task in eliciting sex differences in cardiovascular responding.

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The Relationship of Compliance with Coping Strategies and Self-Esteem

European Journal of Psychological Assessment ◽

10.1027//1015-5759.19.2.117 ◽

2003 ◽

Vol 19 (2) ◽

pp. 117-123 ◽

Cited By ~ 40

Author(s):

Gisli H. Gudjonsson ◽

Jon Fridrik Sigurdsson

Keyword(s):

Sex Differences ◽

Coping Strategies ◽

Multiple Regression ◽

Sex Difference ◽

Test Scores ◽

Self Esteem ◽

Stressful Situation ◽

Men And Women ◽

Relationship Of ◽

The Relationship

Summary: The Gudjonsson Compliance Scale (GCS), the COPE Scale, and the Rosenberg Self-Esteem Scale were administered to 212 men and 212 women. Multiple regression of the test scores showed that low self-esteem and denial coping were the best predictors of compliance in both men and women. Significant sex differences emerged on all three scales, with women having lower self-esteem than men, being more compliant, and using different coping strategies when confronted with a stressful situation. The sex difference in compliance was mediated by differences in self-esteem between men and women.

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Sex Differences in Time Production Revisited

Journal of Individual Differences ◽

10.1027/1614-0001/a000059 ◽

2012 ◽

Vol 33 (1) ◽

pp. 35-42 ◽

Cited By ~ 22

Author(s):

Joseph Glicksohn ◽

Yamit Hadad

Keyword(s):

Sex Differences ◽

Individual Differences ◽

Sex Difference ◽

Absolute Error ◽

Internal Clock ◽

Target Duration ◽

Log P ◽

Men And Women ◽

Time Production ◽

T Score

Individual differences in time production should indicate differences in the rate of functioning of an internal clock, assuming the existence of such a clock. And sex differences in time production should reflect a difference in the rate of functioning of that clock between men and women. One way of approaching the data is to compute individual regressions of produced duration (P) on target duration (T), after log transformation, and to derive estimates for the intercept and the slope. One could investigate a sex difference by comparing these estimates for men and women; one could also contrast them by looking at mean log(P). Using such indices, we found a sex difference in time production, female participants having a relatively faster internal clock, making shorter time productions, and having a smaller exponent. The question is whether a sex difference in time production would be found using other methods for analyzing the data: (1) the P/T ratio; (2) an absolute discrepancy (|P-T|) score; and (3) an absolute error (|P-T|/T) score. For the P/T ratio, female participants have a lower mean ratio in comparison to the male participants. In contrast, the |P-T| and |P-T|/T indices seem to be seriously compromised by wide individual differences.

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