Influences of age and gender on human thermoregulatory responses to cold exposures

1985 ◽  
Vol 58 (1) ◽  
pp. 180-186 ◽  
Author(s):  
J. A. Wagner ◽  
S. M. Horvath
Keyword(s):  
Older Women ◽  
Body Fat ◽  
Young Women ◽  
Cold Exposure ◽  
Physiological Responses ◽  
Metabolic Cost ◽  
Older Men ◽  
Age And Gender ◽  
Younger Women ◽  
And Gender

To delineate age- and gender-related differences in physiological responses to cold exposure, men and women between the ages of 20 and 29 yr and 51 and 72 yr, wearing minimal clothing, were exposed at rest for 2 h to 28, 20, 15, and 10 degrees C room temperatures with 40% relative humidity. During the coldest exposure, the rates of increase in metabolic rate (W X m-2 or ml X kg lean body mass-1 X min-1 were similar for all groups. However, older women (n = 7) may have benefited from a larger (P less than 0.05) early metabolic (M) increase (40% within 15 min) than young men (18%) (n = 10), young women (5%) (n = 10), or older men (5%) (n = 10). A similar rapid M response in older women occurred during the 15 degrees C exposure. During all cold exposures, older women maintained constant rectal temperature (Tre) and young women maintained Tre only during the 20 degrees C exposures, whereas Tre of the men declined during all cold exposures (P less than 0.01). Changes in Tre and mean skin temperature (Ts) during cold exposure were largely related to body fat, although age and surface area/mass modified the changes in men. The data suggest that older men are more susceptible to cold ambients than younger people, since they did not prevent a further decline in their initially relatively low Tre. Despite greater insulation from body fat, the older women maintained a constant Tre at greater metabolic cost than men or younger women.

Age and gender interactions on verbal memory performance

2003 ◽  
Vol 9 (1) ◽  
pp. 97-102 ◽  
Author(s):  
JOEL H. KRAMER ◽  
KRISTINE YAFFE ◽  
JEANNE LENGENFELDER ◽  
DEAN C. DELIS
Keyword(s):  
Older Women ◽  
Verbal Memory ◽  
Memory Performance ◽  
Older Men ◽  
Age And Gender ◽  
Younger Women ◽  
Age Related ◽  
Younger Men ◽  
And Gender ◽  
Gender Interactions

Age and gender effects on verbal episodic memory are well established. However, the possibility of interactions between age and gender has been raised by studies linking estrogen and verbal memory performance, and by research suggesting gender differences in age-related cortical atrophy. We evaluated whether age by gender interactions in verbal memory were present. Subjects within three years of the median age of menopause were excluded from a large cohort of normal subjects, resulting in a younger sample (16–47 years) of 288 men and 285 women, and an older sample (55–89 years) of 201 men and 245 women. All subjects were administered the CVLT-2, a multiple-trial list-learning task. Verbal memory was negatively correlated with age for younger men, older men, and older women, but not for younger women. Multivariate analyses indicated age by gender interactions on memory for the younger group but not the older group. Results indicate that verbal memory declines with age for younger men but not younger women, whereas both older men and older women show age-related declines. These findings are consistent with hypotheses linking estrogen and verbal memory performance, and with imaging data suggesting that age-related hippocampal atrophy is found in younger men but not younger women. The role of estrogen on cognition in normal aging warrants further study. (JINS, 2003, 9, 97–102.)

Influence of age and gender on cardiac output-V˙o 2 relationships during submaximal cycle ergometry

1998 ◽  
Vol 84 (2) ◽  
pp. 599-605 ◽  
Author(s):  
David N. Proctor ◽  
Kenneth C. Beck ◽  
Peter H. Shen ◽  
Tamara J. Eickhoff ◽  
John R. Halliwill ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Stroke Volume ◽  
Age Groups ◽  
Older Men ◽  
Cycle Ergometry ◽  
Age And Gender ◽  
Younger Women ◽  
Leg Cycle Ergometry ◽  
Younger Men ◽  
And Gender

Proctor, David N., Kenneth C. Beck, Peter H. Shen, Tamara J. Eickhoff, John R. Halliwill, and Michael J. Joyner. Influence of age and gender on cardiac output-V˙o 2 relationships during submaximal cycle ergometry. J. Appl. Physiol. 84(2): 599–605, 1998.—It is presently unclear how gender, aging, and physical activity status interact to determine the magnitude of the rise in cardiac output (Q˙c) during dynamic exercise. To clarify this issue, the present study examined theQ˙c-O2 uptake (V˙o 2) relationship during graded leg cycle ergometry in 30 chronically endurance-trained subjects from four groups ( n = 6–8/group): younger men (20–30 yr), older men (56–72 yr), younger women (24–31 yr), and older women (51–72 yr). Q˙c (acetylene rebreathing), stroke volume (Q˙c/heart rate), and whole bodyV˙o 2 were measured at rest and during submaximal exercise intensities (40, 70, and ∼90% of peakV˙o 2). Baseline resting levels of Q˙c were 0.6–1.2 l/min less in the older groups. However, the slopes of theQ˙c-V˙o 2relationship across submaximal levels of cycling were similar among all four groups (5.4–5.9 l/l). The absolute Q˙c associated with a given V˙o 2(1.0–2.0 l/min) was also similar among groups. Resting and exercise stroke volumes (ml/beat) were lower in women than in men but did not differ among age groups. However, older men and women showed a reduced ability, relative to their younger counterparts, to maintain stroke volume at exercise intensities above 70% of peakV˙o 2. This latter effect was most prominent in the oldest women. These findings suggest that neither age nor gender has a significant impact on theQ˙c-V˙o 2relationships during submaximal cycle ergometry among chronically endurance-trained individuals.

Hemodynamics and brain blood flow during posture change in younger women and postmenopausal women compared with age-matched men

2012 ◽  
Vol 112 (9) ◽  
pp. 1482-1493 ◽  
Author(s):  
H. Edgell ◽  
A. D. Robertson ◽  
R. L. Hughson
Keyword(s):  
Older Women ◽  
Young Women ◽  
Stroke Volume Index ◽  
Older Men ◽  
Volume Index ◽  
Men And Women ◽  
Younger Women ◽  
End Tidal ◽  
Older Men And Women ◽  
Forearm Vascular Resistance

Increased incidence of orthostatic hypotension and presyncopal symptoms in young women could be related to hormonal factors that might be isolated by comparing cardiovascular and cerebrovascular responses to postural change in young and older men and women. Seven young women, 11 young men, 10 older women (>1 yr postmenopausal, no hormone therapy), and 9 older men participated in a supine-to-sit-to-stand test while measuring systemic hemodynamics, end-tidal Pco2, and blood flow velocity of the middle cerebral artery (MCA). Women had a greater reduction in stroke volume index compared with age-matched men (change from supine to standing: young women: −22.9 ± 1.6 ml/m2; young men: −14.4 ± 2.4 ml/m2; older women: −17.4 ± 3.3 ml/m2; older men: −13.8 ± 2.2 ml/m2). This was accompanied by offsetting changes in heart rate, particularly in young women, resulting in no age or sex differences in cardiac output index. Mean arterial pressure (MAP) was higher in older subjects and increased with movement to upright postures. Younger men and women had higher forearm vascular resistance that increased progressively in the upright posture compared with older men and women. There was no difference between sexes or ages in total peripheral resistance index. Women had higher MCA velocity, but both sexes had reduced MCA velocity while upright, which was a function of reduced blood pressure at the MCA and a significant reduction in end-tidal Pco2. The reductions in stroke volume index suggested impaired venous return in women, but augmented responses of heart rate and forearm vascular resistance protected MAP in younger women. Overall, these results showed significant sex and age-related differences, but compensatory mechanisms preserved MAP and MCA velocity in young women.

Grandparents and Grandchildren in Kwahu, Ghana: the Performance of Respect

Africa ◽  
2004 ◽  
Vol 74 (1) ◽  
pp. 47-61 ◽  
Author(s):  
Sjaak van der Geest
Keyword(s):  
Older People ◽  
Older Women ◽  
Older Men ◽  
Age And Gender ◽  
Adolescents And Adults ◽  
Anthropological Fieldwork ◽  
And Gender

AbstractThis description of relations between grandparents and grandchildren in a rural Ghanaian community argues that the quality of these relations varies according to age and gender. Literature on African kinship has almost entirely focused on very young grandchildren. This article draws attention to changes that occur when those children grow into adolescents and adults. Grandchildren—both young and old—speak respectfully about their grandparents, but older people regret that their grandchildren do not come to them for advice once they have grown up. Older men seem more ‘neglected’ by their grandchildren than older women. The second argument is about performance: respect, affection and relatedness between grandparents and grandchildren are demonstrated in public even when their ‘contents’ have dwindled. The article is based on anthropological fieldwork over a period of almost ten years.

Wife Killing: Risk to Women as a Function of Age

2000 ◽  
Vol 15 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Todd K. Shackelford ◽  
David M. Buss ◽  
Jay Peters
Keyword(s):  
Older Women ◽  
Young Women ◽  
Older Men ◽  
Elevated Risk ◽  
Excess Risk ◽  
Reproductive Age ◽  
Reproductive Value ◽  
Younger Women ◽  
Reproductive Age Women ◽  
Younger Men

Younger women, relative to older women, incur elevated risk of uxoricide—being murdered by their husbands. Some evolutionary theorists attribute this pattern to men’s evolved sexual proprietariness, which inclines them to use violence to control women, especially those high in reproductive value. Other evolutionary theorists propose an evolved homicide module for wife killing. An alternative to both explanations is that young women experience elevated uxoricide risk as an incidental byproduct of marriage to younger men who commit the majority of acts of violence. We used a sample of 13,670 uxoricides to test these alternative explanations. Findings show that (a) reproductive-age women incur an elevated risk of uxoricide relative to older women; (b) younger men are overrepresented among uxoricide perpetrators; and (c) younger women, even when married to older men, still incur excess risk of uxoricide. Discussion examines competing explanations for uxoricide in light of these findings.

Victimization and Fear of Crime

1996 ◽  
Vol 11 (3) ◽  
pp. 187-197 ◽  
Author(s):  
Michael Weinrath ◽  
John Gartrell
Keyword(s):  
Older Women ◽  
Fear Of Crime ◽  
Crime Analysis ◽  
Age And Gender ◽  
Younger Women ◽  
Victimization Surveys ◽  
Different Types ◽  
Canadian City ◽  
And Gender

Victimization has generally been associated with increased fear of crime. Analysis of two very large victimization surveys completed in the Canadian city of Edmonton, Alberta, explores the ways in which age and gender condition the experience of different types of victimization. While younger women were sensitized by assault (current or prior), older women appeared to be desensitized by similar victimization.

CERVICAL CANCER AMONG 39 YEARS OR YOUNGER FEMALES IN SOUTH INDIA; A RETROSPECTIVE STUDY

2021 ◽  
pp. 15-17
Author(s):  
B Ramkumar ◽  
Srigopal Mohanty ◽  
Kiranmayee Narapaneni ◽  
Amit Saklani ◽  
J Kannan
Keyword(s):  
Cervical Cancer ◽  
Retrospective Study ◽  
Older Women ◽  
Young Women ◽  
Clinicopathological Characteristics ◽  
Categorical Variables ◽  
Chi Square ◽  
Younger Women ◽  
Ciency Virus ◽  
Chi Square Test

Background: Cervical cancer in young women is rare and disparity exists in its characteristics in the available reports. The study aimed to determine the disease burden and to compare its clinicopathological characteristics with older women. Materials and methods: Retrospective study was performed by retrieving data from the cancer registry for consecutive 843 cervical cancer patients treated in the center between 2017 and 2020. Patients were divided into younger (<40 years) and older (≥ 40 years) age. Statistical analysis was performed using SPSS software version 23 for windows. Chi square test was used for analyzing the categorical variables and P < 0.05 was considered signicant. Results: Cervical cancer in young women constituted 9.4%, with majority (96.2%) belonged to 30-39 years age. Higher prevalence of human immunodeciency virus (HIV) was found among younger compared to older women (P = 0.000). Younger women commonly presented late compared to older women (patients presented after 4 months are 49.4% vs. 18.8% respectively, P=0.000). Squamous cell carcinoma was commonest histology in both the groups and no difference in histology pattern between the two groups. Younger women had higher rate of bulky tumor (>4cm) compared to older (62.2% vs. 44.4%, P = 0.023). Conclusion: Delayed and advanced stage of presentation of cervical cancer in younger women in this region of India warrants promotion of health education, knowledge translation, regular cervical cancer screening for its prevention and early detection

Metabolic and thermal responses of women during cooling in water

1974 ◽  
Vol 36 (5) ◽  
pp. 577-580 ◽  
Author(s):  
J. Kollias ◽  
L. Barlett ◽  
V. Bergsteinova ◽  
J. S. Skinner ◽  
E. R. Buskirk ◽  
...  
Keyword(s):  
Body Fat ◽  
Young Women ◽  
Heat Production ◽  
Cold Exposure ◽  
Korean Women ◽  
Mass Ratio ◽  
Body Fatness ◽  
Body Fat Content ◽  
Tissue Insulation ◽  
Skin Temperatures

The metabolic and thermal responses of 10 young women, 3 lean (21–24% fat) and 7 obese (29–41% fat), were measured during head-out immersion in a stirred water bath maintained at 20°C. Continuous measurements of heat production (M), rectal (Tre, esophageal (Tes), and skin temperatures were obtained. The rate and magnitude of the increase in M and decrease in core temperatures were significantly greater in the lean than the obese group. Tissue insulation values for lean women were similar to those reported for diving and nondiving Korean women in 30°C water. Lean women with 22% body fat have a larger SA/mass ratio than men of comparable body fat content and cool at a greater rate. It is concluded that SA/mass as well as body fatness and size must be considered in the overall metabolic and thermal responses to cold exposure.

Quotas, the Electoral System Type and the Election of Young Women

2020 ◽  
Author(s):  
Daniel Stockemer ◽  
Aksel Sundström
Keyword(s):  
Quantitative Study ◽  
Young Women ◽  
Electoral Systems ◽  
Electoral System ◽  
Partial Support ◽  
Specific Group ◽  
Younger Women ◽  
System Type ◽  
And Gender ◽  
Gender Quota

Abstract This article focuses on a specific group of legislators facing large hurdles during recruitment processes, namely young women. Building on the institutional literature, we hypothesize that gender quota regulations, youth quotas, and proportional representation (PR) electoral systems should particularly benefit young women. Our quantitative study, capturing one hundred elections conducted between 2012 and 2017, finds partial support for our expectations. For the three hypotheses, we find that legislative quotas and voluntary party quotas for both youths and gender do not significantly increase the share of young women. In contrast, PR electoral systems render the electoral arena less discriminatory toward younger women.

Reference intervals for plasma lipoperoxides: age-, sex-, and specimen-related variations.

1987 ◽  
Vol 33 (12) ◽  
pp. 2289-2291 ◽  
Author(s):  
J A Knight ◽  
S E Smith ◽  
V E Kinder ◽  
H B Anstall
Keyword(s):  
Older Women ◽  
Young Women ◽  
Blood Donors ◽  
Sodium Citrate ◽  
Older Men ◽  
Reference Intervals ◽  
Female Adult ◽  
Experimental Animals ◽  
Age Related ◽  
Younger Men

Abstract We measured lipoperoxides, as malondialdehyde (MDA), by liquid chromatography in plasma from 230 male and 148 female adult blood donors, to establish reliable reference values and to compare possible sex-, age-, and specimen-related differences. Our studies show that mean have higher MDA concentrations in plasma than do women (P less than 0.05), older men have higher values than younger men (P less than 0.05), and older women have higher values than young women (P less than 0.001). These age-related results support earlier studies in experimental animals that lipid peroxidation increases with increasing age. In addition, plasma from liquid EDTA-anti-coagulated blood has significantly lower MDA concentrations than does serum or plasma from blood treated with lithium heparin, sodium citrate, or CPDA-1 (P less than 0.001).

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