scholarly journals Elite swimmers do not exhibit a body mass index trade-off across a wide range of event distances

2018 ◽  
Vol 285 (1882) ◽  
pp. 20180684
Author(s):  
Christian M. Gagnon ◽  
Michael E. Steiper ◽  
Herman Pontzer

There is a trade-off reflected in the contrasting phenotypes of elite long-distance runners, who are typically leaner, and elite sprinters, who are usually more heavily muscled. It is unclear, however, whether and how swimmers' bodies vary across event distances from the 50 m swim, which is about a 20–30 s event, to the 10 000 m marathon swim, which is about a 2 h event. We examined data from the 2012 Olympics to test whether swimmers’ phenotypes differed across event distances. We show that across all swimming event distances, from the 50 m sprint to the 10 000 m marathon, swimmers converge on a single optimal body mass index (BMI) in men's and women's events, in marked contrast with the strong inverse relationship between BMI and event distance found in runners. The absence of a speed–endurance trade-off in the body proportions of swimmers indicates a fundamental difference in design pressures and performance capability in terrestrial versus aquatic environments.

2021 ◽  
Vol 9 (5) ◽  
pp. 468-476
Author(s):  
Anjali Belwal ◽  
◽  
Reena Kumari ◽  
Deepak Nainwal ◽  
◽  
...  

Background: Adolescent is characterised by rapid physical growth and sexual development, accompanied by changes in the percentage of body fat. Obesity and underweight are one of the most prominent problems of the modern society which consists of a wide range of short-term and long-term complications. The rising prevalence of childhood obesity is directly related to the vascular, metabolic condition and risk factor to cognitive decline or dementia. Under-weight is also often associated with acute and chronic medical complications like Anorexia nervosa, low bone density and mass with impaired immune system and increased mortality rate. Therefore purpose of this study is to identify early signs of impaired BMI as a cause of cognitive impairment and prevent the child obesity and underweight to overcome the future health risk factors. The aim of this study is to find a correlation between BMI and MMSE score in Indian adolescent females. Methodology: 31 female subjects with mean age 16±3 years were selected according to random sampling in this study. The Quetlets formula was used to measure body mass index. Group division for Underweight, Normal and Over-weight was done for the BMI score then Score of MMSE, a measure of cognition was taken. Data was analyzed using SPSS version 16. The Karl Pearsons Coefficient correlation was calculated to see correlation between BMI and MMSE cognitive function. P < 0.05 was considered of statistical significance. Result: The study found correlative change in variables as observed in group A MMSE mean 25.84±3.83 and BMI mean 16.10±1.08 with P<0.05 i.e which was found statically significant. In group B MMSE mean 26.22±1.30 and BMI mean 20.60±1.80 with P>0.05 i.e which was found statically non significnat. In group C MMSE mean 23.00±3.46 and BMI mean 26.06±1.15 with P<0.05 i.e which was found statically significant. And in total number of subject MMSE mean 25.68±3.3 and BMI mean 18.37±3.51with P>0.05. it was found that there was a significant correlation between the body mass index and cognition in group A and group C but there was no significant correlation between body mass index and cognition in group B and total number of subjects(31). Conclusion: The study conclude to state that there exist a significance correlation and of body mass index on cognition.


2018 ◽  
Vol 29 (5) ◽  
pp. 469-471 ◽  
Author(s):  
M.B. Ramesh ◽  
S. Ammu ◽  
A.K. Nayanatara ◽  
N.A. Vinodini ◽  
K.C. Pratik ◽  
...  

Abstract Background The increasing prevalence of overweight and obesity is a critical public health problem for women. The negative effect of stress on memory and cognitive functions has been widely explored for decades in numerous research projects using a wide range of methodology. Deterioration of memory and other brain functions is a hallmark of Alzheimer’s disease. Estrogen fluctuations and withdrawal have myriad direct effects on the central nervous system that have the potential to influence cognitive functions. The present study aims to compare the effect of stress on the cognitive functions in overweight/obese women before and after menopause. Methods A total of 142 female subjects constituting women before menopause between the ages of 18 and 44 years and women after menopause between the ages of 45 and 60 years were included in the sample. Participants were categorized into overweight/obese groups based on the body mass index. The major tool perceived stress scale was used for measuring the perception of stress. On the basis of the stress scale measurement, each group was classified into with stress and without stress. Addenbrooke’s Cognitive Examination-III was used for measuring the cognitive functions. Results Premenopausal women with stress showed a significant (p<0.05) decrease in the cognitive parameters such as attention and orientation, fluency, language and visuospatial ability. Memory did not show any significant changes in this group. Whereas, in the postmenopausal stressed women, all the cognitive functions except fluency showed a significant (p<0.05) decrease. Conclusions Stress is a significant factor on the cognitive functions of obese and overweight women before and after menopause. Practice of yoga and encouragement in activities like gardening, embroidery, games and relaxation techniques should be recommended to prevent stress. Insights into the neurobiology before and after menopause can be gained from future studies examining the effect on the hypothalamic-pituitary-adrenal axis in relation to cognition and stress.


2020 ◽  
Vol 198 (4) ◽  
pp. 832-844
Author(s):  
Dariusz Lenart

The study aims to assess the relationship between the body structure, physical fitness, and functional parameters of the respiratory system of the cadets from the General Tadeusz Kościuszko Military University of Land Forces (AWL) and their results in passing selected obstacle courses. The research material was collected from testing cadets of the third year of management studies. The research included anthropometric measurements, physical fitness tests, spirometry, and tests determining the level of passing selected obstacle courses. Body height and weight were measured. The body mass index was also calculated. Besides, the following functional characteristics were measured: cardiopulmonary endurance, functional strength, running speed and agility, balance, forced expiratory volume in 1 second, forced vital capacity, and peak expiratory flow. The study also included tests determining the level of passing the land and water obstacle courses. Statistically significant relationships were found between height and weight, balance, and forced expiratory volume in 1 second. Moreover, there were correlations between body weight and body mass index and the results in passing the land obstacle course. In addition, there were connections between cardiopulmonary endurance and performance in passing the land obstacle course, body balance, and performance in passing the land and water obstacle course. All the relationships mentioned above were low and statistically significant.


2021 ◽  
Vol 5 (1) ◽  
pp. 73
Author(s):  
Olvinda Eka Zulfi ◽  
Sri Ratna Dwiningsih ◽  
Ilya Krisnana

 AbstractBackground : Menopause is a natural period in a woman's life related to hormonal changes and is marked by the cessation of menstruation in the last 12 months and can cause a wide range of sometimes bothersome menopause symptoms. That menopause symptoms associated with several risk factors such as Body Mass Index (BMI) and knowledge. The study aims to identify the relationship of BMI and knowledge with menopause symptoms in the Shafa group Padang Petok Nagari Panti Selatan. Method : This research is analitic observational research with cross sectional approach. The sampling technique was carried out by total sampling consisting of 55 respondents with inclusion criteria menopause women aged 45-65 years who have not experienced dementia, have good awareness and willing to be respondents. Data were obtained by weighing, measuring height and filling out The Menopause Rating Scale to evaluate the severity of menopause-related symptoms by respondents. Afterwards the data was analyzed by the Spearman rho test to see the association between BMI and knowledge with menopause symptoms. Result : The research shows 65,4% respondents with high BMI, 72,7% with lacking of knowledge and 60% with severe menopause symptoms. The results of the Spearman rho test showed a relationship between BMI and menopause symptoms (p value = 0.000), but there is no relationship between knowledge of menopause and menopause symptoms (p= 0,450).  Conclusion : BMI related to menopause symptoms. Menopause women must monitor their weight in an effort to prevent these complaints. 


2007 ◽  
Vol 177 (4S) ◽  
pp. 64-64
Author(s):  
Murugesan Manoharan ◽  
Martha A. Reyes ◽  
Alan M. Nieder ◽  
Bruce R. Kava ◽  
MarkS Soloway

Author(s):  
K. Subramanyam ◽  
Dr. P. Subhash Babu

Obesity has become one of the major health issues in India. WHO defines obesity as “A condition with excessive fat accumulation in the body to the extent that the health and wellbeing are adversely affected”. Obesity results from a complex interaction of genetic, behavioral, environmental and socioeconomic factors causing an imbalance in energy production and expenditure. Peak expiratory flow rate is the maximum rate of airflow that can be generated during forced expiratory manoeuvre starting from total lung capacity. The simplicity of the method is its main advantage. It is measured by using a standard Wright Peak Flow Meter or mini Wright Meter. The aim of the study is to see the effect of body mass index on Peak Expiratory Flow Rate values in young adults. The place of a study was done tertiary health care centre, in India for the period of 6 months. Study was performed on 80 subjects age group 20 -30 years, categorised as normal weight BMI =18.5 -24.99 kg/m2 and overweight BMI =25-29.99 kg/m2. There were 40 normal weight BMI (Group A) and 40 over weight BMI (Group B). BMI affects PEFR. Increase in BMI decreases PEFR. Early identification of risk individuals prior to the onset of disease is imperative in our developing country. Keywords: BMI, PEFR.


2020 ◽  
Author(s):  
Valentina Cazzato ◽  
Elizabeth Walters ◽  
Cosimo Urgesi

We examined whether visual processing mechanisms of the body of conspecifics are different in women and men and whether these rely on westernised socio-cultural ideals and body image concerns. Twenty-four women and 24 men performed a visual discrimination task of upright or inverted images of female or male bodies and faces (Experiment 1) and objects (Experiment 2). In Experiment 1, both groups of women and men showed comparable abilities in the discrimination of upright and inverted bodies and faces. However, the genders of the human stimuli yielded different effects on participants’ performance, so that male bodies and female faces appeared to be processed less configurally than female bodies and male faces, respectively. Interestingly, altered configural processing for male bodies was significantly predicted by participants’ Body Mass Index (BMI) and their level of internalization of muscularity. Our findings suggest that configural visual processing of bodies and faces in women and men may be linked to a selective attention to detail needed for discriminating salient physical (perhaps sexual) cues of conspecifics. Importantly, BMI and muscularity internalization of beauty ideals may also play a crucial role in this mechanism.


2020 ◽  
Vol 66 (1) ◽  
pp. 71-78
Author(s):  
Lev Bershteyn ◽  
Aleksandr Ivantsov ◽  
Aglaya Ievleva ◽  
A. Venina ◽  
I. Berlev

The aim of this study was to evaluate steroid receptors’ status of tumor tissue in different molecular biological types of endometrial cancer (EC), subdivided according to the current classification, and their colonization by lymphocytic and macrophage cells, taking into account body mass index of the patients. Materials and methods: Material from treatment-naive patients with EC (total n = 229) was included; the number of sick persons varied depending on the method used. The average age of patients was close to 60 years, and about 90% of them were postmenopausal. It was possible to divide the results of the work into two main subgroups: a) depending on the molecular biological type of the tumor (determined on the basis of genetic and immunohistochemical analysis), and b) depending on the value of the body mass index (BMI). The latter approach was used in patients with EC type demonstrating a defective mismatch repair of the incorrectly paired nucleotides (MMR-D) and with a type without characteristic molecular profile signs (WCMP), but was not applied (due to the smaller number of patients) in EC types with a POLE gene mutation or with expression of the oncoprotein p53. According to the data obtained, when comparing various types of EC, the lowest values of Allred ER and PR scores were revealed for POLE-mutant and p53 types, while the “triple-negative” variant of the tumor (ER-, PR-, HER2/neu-) was most common in POLE-mutant (45.5% of cases) and WCMP (19.4%) types of EC. The p53+ type of EC is characterized by inclination to the higher expression of the macrophage marker CD68 and lymphocytic Foxp3, as well as mRNA of PD-1 and SALL4. In addition to the said above, for WCMP type of EC is peculiar, on the contrary, a decrease in the expression of lymphocytic markers CD8 (protein) and PD-L1 (mRNA). When assessing the role of BMI, its value of >30.0 (characteristic for obesity) was combined with an inclination to the increase of HER-2/neu expression in the case of MMR-D EC type and to the decrease of HER-2 /neu, FOXp3 and ER expression in WCMP type. Conclusions: The accumulated information (mainly describing here hormonal sensitivity of the tumor tissue and its lymphocytic-macrophage infiltration) additionally confirms our earlier expressed opinion that the differences between women with EC are determined by both the affiliation of the neoplasm to one or another molecular biological type (subdivided according to the contemporary classification), as well as by body mass value and (very likely) the associated hormonal and metabolic attributes.


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