scholarly journals Sunscreen Use and Sweat Production in Men and Women

2016 ◽  
Vol 51 (9) ◽  
pp. 696-700 ◽  
Author(s):  
Jorge Aburto-Corona ◽  
Luis Aragón-Vargas
Keyword(s):  
Sweat Rate ◽  
Control Treatment ◽  
Organic Chemical ◽  
Physically Active ◽  
Men And Women ◽  
Exercise Condition ◽  
Sweat Production ◽  
Randomized Crossover Study ◽  
Sweat Collection ◽  
Apparently Healthy

Context: Sunscreen lotions are important to protect the skin during outdoor exercise, but they may interfere with sweating. Objective: To measure the effect of 2 water-resistant sunscreens on local sweat production in men and women exercising in the heat and to compare those effects with the expected inhibition resulting from the use of an antiperspirant. Design: Randomized crossover study. Setting: Exercise in the heat (ambient temperature = 30.2°C ± 0.4°C dry bulb and 58% ± 4.3% relative humidity) in a controlled-environment laboratory. Patients or Other Participants: Twenty physically active, apparently healthy college students, 10 men (age = 22.5 ± 2.8 years, height = 1.771 ± 0.069 m, mass = 70.2 ± 11.0 kg) and 10 women (age = 22.2 ± 3.2 years, height = 1.625 ± 0.075 m, mass = 57.7 ± 7.9 kg). Intervention(s): With sweat-collection patches applied to their right and left scapular regions, the participants performed 2 exercise sessions on consecutive days. We assigned skin treatments (antiperspirant; organic chemical sun filter, sunscreen A; inorganic physical sun block, sunscreen B; no lotion) randomly to side and session. Participants pedaled at 79% ± 1% of maximum heart rate for 20 minutes in the heat. Main Outcome Measure(s): Scapular localized sweat rate. Results: No baseline, environmental, or exercise condition was different among skin treatments. Scapular localized sweat rate was lower for the antiperspirant treatment (88.3 μL/min·dm2; 95% confidence interval [CI] = 82.0, 94.7 μL/min·dm2) and the inorganic physical sun block (sunscreen B) treatment (99.3 μL/min·dm2; 95% CI = 93.1, 105.5 μL/min·dm2) than for the organic chemical sun filter (sunscreen A) treatment (114.8 μL/min·dm2; 95% CI = 108.8, 120.6 μL/min·dm2) or the no-lotion treatment (122.6 μL/min·dm2; 95% CI = 116.2, 129.0 μL/min·dm2; P < .01). Conclusions: The inorganic physical sun block, sunscreen B, hindered effective sweating to the same extent as the antiperspirant, whereas the treatment with the organic chemical sun filter, sunscreen A, was not different from the control treatment. At this stage, it is not possible to identify the specific ingredient responsible for the effect.

Pubertal Induction of Sweat Gland Activity

1981 ◽  
Vol 60 (6) ◽  
pp. 689-692 ◽  
Author(s):  
J. Rees ◽  
S. Shuster
Keyword(s):  
Gene Expression ◽  
Sweat Gland ◽  
Sweat Rate ◽  
Adult Life ◽  
Men And Women ◽  
Normal People ◽  
Sweat Production ◽  
Before And After ◽  
Prepubertal Boys ◽  
The Difference

1. To study the difference in sweat rate between men and women the rates of cholinergic-induced sweating were measured in normal people before and after puberty and in response to androgens and anti-androgens. 2. Sweat rate in men was more than double that in women. 3. This difference did not occur in prepubertal boys and girls in whom the rate, corrected for surface area, was comparable with that in women. 4. Application or injection of androgen locally did not stimulate sweat production in the adult female. 5. Anti-androgen topically or systemically did not decrease sweat rate in men. 6. It is concluded that the rate of sweat rate in men is caused by androgen-induced gene expression at puberty and not by androgen modulation in adult life.

scholarly journals Cutaneous adrenergic nerve blockade attenuates sweating during incremental exercise in habitually trained men

2018 ◽  
Vol 125 (4) ◽  
pp. 1041-1050 ◽  
Author(s):  
Tatsuro Amano ◽  
Naoto Fujii ◽  
Yoshimitsu Inoue ◽  
Narihiko Kondo
Keyword(s):  
Sweat Rate ◽  
Area Under The Curve ◽  
Incremental Exercise ◽  
Adrenergic Nerves ◽  
Control Treatment ◽  
Adrenergic Nerve ◽  
Saline Control ◽  
Nerve Blockade ◽  
Maximum Workload ◽  
Sweat Production

It remains unknown whether cutaneous adrenergic nerves functionally contribute to sweat production during exercise. This study examined whether cutaneous adrenergic nerve blockade attenuates sweating during incremental exercise, specifically in habitually trained individuals. Accordingly, 10 habitually trained and 10 untrained males (V̇o2max: 56.7 ± 5.4 and 38.9 ± 6.7 ml·kg−1·min−1, respectively; P < 0.001) performed incremental semirecumbent cycling (20 W/min) until exhaustion. Sweat rates (ventilated capsule) were measured at two bilateral forearm skin sites on which either 10 mM bretylium tosylate (BT) (an inhibitor of neurotransmitter release from sympathetic adrenergic nerve terminals) or saline (Control) was transdermally administered via iontophoresis. BT treatment delayed sweating onset in both groups (∼0.66 min; P = 0.001) and suppressed the sweat rate relative to the Control treatment at ≥70% relative total exercise time in trained individuals (each 10% increment; all P ≤ 0.009) but not in untrained counterparts ( P = 0.122, interaction between relative time × treatment). Changes in total sweat production at the BT site relative to the Control site were greater in trained individuals than in untrained counterparts (area under the curve, −0.86 ± 0.67 and −0.22 ± 0.39 mg/cm2, respectively; P = 0.023). In conclusion, we demonstrated that cutaneous adrenergic nerves do modulate sweating during incremental exercise, which appeared to be more apparent in habitually trained men (e.g., ≥70% maximum workload). Although our results indicated that habitual exercise training may augment neural adrenergic sweat production during incremental exercise, additional studies are required to confirm this possibility. NEW & NOTEWORTHY We demonstrated for the first time that cutaneous adrenergic nerves do modulate sweating during high-intensity exercise in humans (≥70% maximum workload). In addition, neural adrenergic sweating appeared to be greater in habitually trained individuals than in untrained counterparts, although further studies are necessary to confirm such a possibility. Nonetheless, the observations presented herein advance our understanding on human thermoregulation while providing new evidence for the neutral mediation of adrenergic sweating during exercise.

scholarly journals iNOS-dependent sweating and eNOS-dependent cutaneous vasodilation are evident in younger adults, but are diminished in older adults exercising in the heat

2016 ◽  
Vol 120 (3) ◽  
pp. 318-327 ◽  
Author(s):  
Naoto Fujii ◽  
Robert D. Meade ◽  
Lacy M. Alexander ◽  
Pegah Akbari ◽  
Imane Foudil-bey ◽  
...  
Keyword(s):  
Older Adults ◽  
Intermittent Exercise ◽  
Sweat Rate ◽  
Fixed Rate ◽  
Younger Adults ◽  
Physically Active ◽  
Cutaneous Vasodilation ◽  
Inos Inhibitor ◽  
Oxide Synthase ◽  
Inos Inhibition

Nitric oxide synthase (NOS) contributes to sweating and cutaneous vasodilation during exercise in younger adults. We hypothesized that endothelial NOS (eNOS) and neuronal NOS (nNOS) mediate NOS-dependent sweating, whereas eNOS induces NOS-dependent cutaneous vasodilation in younger adults exercising in the heat. Further, aging may upregulate inducible NOS (iNOS), which may attenuate sweating and cutaneous vasodilator responses. We hypothesized that iNOS inhibition would augment sweating and cutaneous vasodilation in exercising older adults. Physically active younger ( n = 12, 23 ± 4 yr) and older ( n = 12, 60 ± 6 yr) adults performed two 30-min bouts of cycling at a fixed rate of metabolic heat production (400 W) in the heat (35°C). Sweat rate and cutaneous vascular conductance (CVC) were evaluated at four intradermal microdialysis sites with: 1) lactated Ringer (control), 2) nNOS inhibitor (nNOS-I, NPLA), 3) iNOS inhibitor (iNOS-I, 1400W), or 4) eNOS inhibitor (eNOS-I, LNAA). In younger adults during both exercise bouts, all inhibitors decreased sweating relative to control, albeit a lower sweat rate was observed at iNOS-I compared with eNOS-I and nNOS-I sites (all P < 0.05). CVC at the eNOS-I site was lower than control in younger adults throughout the intermittent exercise protocol (all P < 0.05). In older adults, there were no differences between control and iNOS-I sites for sweating and CVC during both exercise bouts (all P > 0.05). We show that iNOS and eNOS are the main contributors to NOS-dependent sweating and cutaneous vasodilation, respectively, in physically active younger adults exercising in the heat, and that iNOS inhibition does not alter sweating or cutaneous vasodilation in exercising physically active older adults.

The Effects of Walking on Gastrocnemius Cooling During an Ice Bag Treatment

2014 ◽  
Vol 19 (6) ◽  
pp. 34-40 ◽  
Author(s):  
Stephanie J. Guzzo ◽  
Susan W. Yeargin ◽  
Jeffery S. Carr ◽  
Timothy J. Demchak ◽  
Jeffrey E. Edwards
Keyword(s):  
Outcome Measures ◽  
Gastrocnemius Muscle ◽  
Athletic Trainers ◽  
Exercise Physiology ◽  
Lower Extremity Injury ◽  
Physically Active ◽  
Treatment Conditions ◽  
Males And Females ◽  
Physiology Laboratory ◽  
Randomized Crossover Study

Context:Many athletic trainers use “ice to go” to treat their athletes. However, researchers have reported that icing a working muscle may negate intramuscular (IM) cooling.Objective:The purpose of our study was to determine the length of time needed to cool the gastrocnemius while walking followed by rest.Design:A randomized crossover study design was used.Setting:Exercise Physiology Laboratory.Patients or Other Participants:Nine healthy, physically active males and females (males 5, females 4; age 24.0 ± 2.0 years; height 174.0 ± 8.0 cm; weight 86.3 ± 6.5 kg; skinfold taken at center of gastrocnemius greatest girth, R leg 20.3 ± 4.4 mm, L leg 19.6 ± 4.1 mm) without lower extremity injury or cold allergy volunteered to complete the study.Intervention:Participants randomly experienced three treatment conditions on separate days: rest (R), walk for 15 minutes followed by rest (W15R), or walk for 30 minutes followed by rest (W30R). During each treatment, participants wore a 1 kg ice bag secured to their right gastrocnemius muscle. Participants walked at a 4.5km/hr pace on a treadmill during the W15R and W30R trials.Main Outcome Measures:A 1 × 3 within groups ANOVA was used to determine the effect of activity on cooling time needed for the gastrocnemius temperature to decrease 6 °C below baseline.Results:The R condition cooled faster (25.9 ± 5.5 min) than both W15R (33.7 ± 9.3 min;P= .002) and W30R (49.4 ± 8.4 min;P< .001). Average time to decrease 6 °C after W15R was 18.7 ± 9.3 minutes and after W30R was 19.4 ± 8.4 minutes.Conclusions:Clinicians should instruct their patients to stay and ice or to keep the ice on for an additional 20 minutes after they stop walking and begin to rest.

Variation of cardiac magnetic resonance radiomics features by age and sex in healthy participants from the UK Biobank

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
Z Raisi-Estabragh ◽  
A Jaggi ◽  
N Aung ◽  
S Neubauer ◽  
S Piechnik ◽  
...  
Keyword(s):  
Risk Factors ◽  
Cardiac Magnetic Resonance ◽  
Age Groups ◽  
Texture Features ◽  
Funding Source ◽  
Uk Biobank ◽  
Men And Women ◽  
The Uk ◽  
Age And Sex ◽  
Apparently Healthy

Abstract Introduction Cardiac magnetic resonance (CMR) radiomics use voxel-level data to derive quantitative indices of myocardial tissue texture, which may provide complementary risk information to traditional CMR measures. Purpose In this first stage of our work, establishing the performance characteristics of CMR radiomics in relation to disease outcomes, we aimed to elucidate differences in radiomic features by sex and age in apparently healthy adults. Methods We defined a healthy cohort from the first 5,065 individuals completing the UK Biobank Imaging Enhancement, limiting to white Caucasian ethnicity, and excluding those with major co-morbidities, or cardiovascular risk factors/symptoms. We created evenly distributed age groups: 45–54 years, 55–64 years, 65–74 years. Radiomics features were extracted from left ventricle segmentations, with normalisation to body surface area. We compared mean values of individual features between the sexes, stratified by age and separately between the oldest and youngest age groups for each sex. Results We studied 657 (309 men, 358 women) healthy individuals. There were significant differences between radiomics features of men and women. Different features appeared more important at different age groups. For instance, in the youngest age group “end-systolic coarseness” showed greatest difference between men and women, whilst “end-diastolic run percentage” and “end-diastolic high grey level emphasis” showed most variation in the oldest and middle age groups. In the oldest age groups, differences between men and women were most predominant in the texture features, whilst in the younger groups a mixture of shape and texture differences were observed. We demonstrate significant variation between radiomics features by age, these differences are exclusively in texture features with different features implicated in men and women (“end-diastolic mean intensity” in women, “end-systolic sum entropy in men”). Conclusions There are significant age and sex differences in CMR radiomics features of apparently healthy adults, demonstrating alterations in myocardial architecture not appreciated by conventional indices. In younger ages, shape and texture differences are observed, whilst in older ages texture differences dominate. Furthermore, texture features are the most different features between the youngest and oldest hearts. We provide proof-of-concept data indicating CMR radiomics has discriminatory value with regard to two characteristics strongly linked to cardiovascular outcomes. We will next elucidate relationships between CMR radiomics, cardiac risk factors, and clinical outcomes, establishing predictive value incremental to existing measures. Funding Acknowledgement Type of funding source: Other. Main funding source(s): European Union's Horizon 2020 research and innovation programme (825903),British Heart Foundation Clinical Research Training Fellowship (FS/17/81/33318)

Staying ‘stoked’: Surfing, ageing and post-youth identities

2017 ◽  
Vol 54 (4) ◽  
pp. 387-409 ◽  
Author(s):  
Belinda Wheaton
Keyword(s):  
Middle Age ◽  
Cultural Barriers ◽  
Physically Active ◽  
Men And Women ◽  
Male And Female ◽  
South West ◽  
Barriers And Challenges ◽  
Ways Of Being ◽  
Scholarly Attention ◽  
Equipment Performance

Surfing has consistently been framed as a youth focused, male-dominated sport and culture. Despite surfing’s ageing demographic, neither the ways in which age impacts on surfing identities and mobilities, nor older surfer’s experiences and subjectivities, has been given scholarly attention. In this paper, I discuss research exploring the experiences and identities of middle-aged and older recreational male and female surfers in the south and south-west of England. The research illustrates that participation in surfing as a sport and lifestyle remains highly significant for some men and women through middle-age and into retirement. I consider the cultural barriers and challenges in dealing with a loss in physical performance through ageing, such as adaptations to their equipment, performance, and style, and the implications for how individuals negotiate bodily capital, space and identity. Nonetheless, older surfers also embrace different ways of being a surfer which challenge some of the more exclusionary aspects of surfing identities. Theoretically the paper develops an intersectional approach to sporting identity that explicitly recognises and accounts for the contribution of age to social identity. The research also contributes to the growing literature on physically active ‘post-youth’ leisure lifestyles, illustrating how shifting definitions of ageing have given ‘rise to new expectations, priorities and understandings’ of sporting lifestyles amongst those in middle age, and beyond.

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