The relationship between anxiety and the cortisol level in precompetition bodybuilding athletes

Ferreira, Licia Cerqueira; Aidar, Felipe J.; Cabral, Breno G. de Araújo Tinôco; Matos, Dihogo GAMA de; Gantois, Petrus; Santos, Marcelo D. MATOS dos; Vilaça-Alves, José; Curty, Victor Magalhães; Tavares, Carlos Gonçalves; Sousa, Nélson

doi:10.23736/s0025-7826.17.03178-7

Cited by 3 publications

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“…Despite advancements in manual portable centrifuges, there remains a gap for handpowered centrifuges that are portable, practical, low-cost, and comparable in performance to conventional centrifuges. Blood, in particular, is usually separated by applying a relative centrifugal force (RCF) of approximately 800 g; the liquid part separated from red blood cells, white blood cells, and platelets contain essential biological molecules like cortisol and fibrin [14,15], providing the raw materials for function tests. Accordingly, we designed a portable centrifuge inspired by a hand-pulled spinning top and driven by a pullcord.…”

Section: Introductionmentioning

confidence: 99%

Design and Application of Portable Centrifuge Inspired by a Hand-Powered Spinning Top

Tang,

Duan,

Liu

et al. 2023

Micromachines

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Traditional centrifuges, extensively employed in biology, chemistry, medicine, and other domains for tasks such as blood separation and pathogen extraction, have certain limitations. Their high cost, substantial size, and reliance on electricity restrict their range of application. Contemporary centrifuges, inspired by everyday items like paper trays and egg beaters, boast characteristics such as ease of operation, independence from electricity, and portability. These features offer unique advantages in specific situations, such as electricity shortages, inadequate infrastructure, and challenging medical conditions. Consequently, we designed a hand-powered portable centrifuge driven by pulling a rope. Our experiments revealed significant performance factors, including load capacity, rope length, and frequency of rope pulling. The results demonstrated that the revolutions per minute (RPM) of a hand-powered portable centrifuge were directly proportional to the length of the rope and the frequency of pulling, up to a certain limit, while inversely proportional to the load. When used for separating and washing polystyrene microspheres, the portable centrifuge’s performance equaled that of traditional centrifuges. According to relevant calculations, this centrifuge could be capable of meeting the application of blood separation. Therefore, we believe this portable centrifuge will find meaningful applications in similar areas, particularly in resource-poor settings.

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Section: Introductionmentioning

confidence: 99%

Design and Application of Portable Centrifuge Inspired by a Hand-Powered Spinning Top

Tang,

Duan,

Liu

et al. 2023

Micromachines

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Effect of photoperiod on the anxiety of zebrafish

Zhang,

Tao,

Shen

et al. 2024

Environ Biol Fish

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Towards a Sustainable Nutrition Paradigm in Physique Sport: A Narrative Review

Helms

Prnjak

Linardon

2019

Sports

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Physique athletes strive for low body fat with high lean mass and have higher body image and eating disorder rates than the general population, and even other weightlifting populations. Whether athletes with a background or tendency to develop these issues are drawn to the sport, or whether it drives these higher incidences, is unknown. However, the biological drive of cyclical energy restriction may contribute to binge-eating behavior. Additionally, requisite monitoring, manipulation, comparison, and judgement of one’s physique may contribute to body image concerns. Contest preparation necessitates manipulating body composition through energy restriction and increased expenditure, requiring dietary restraint and nutrition, exercise, and physique assessment. Thus, competitors are at mental health risk due to (1) pre-existing or predispositions to develop body image or eating disorders; (2) biological effects of energy restriction on eating psychology; and (3) dietary restraint attitudes and resultant physique, exercise, and nutrition monitoring behavior. In our narrative review we cover each factor, concluding with tentative best-practice recommendations, including dietary flexibility, slower weight loss, structured monitoring, gradual returns to offseason energy intakes, internal eating cues, appropriate offseason body compositions, and support from nutrition and mental health professionals. A mental health focus is a needed paradigm shift in bodybuilding nutrition practice and research.

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The relationship between anxiety and the cortisol level in precompetition bodybuilding athletes

Cited by 3 publications

References 0 publications

Design and Application of Portable Centrifuge Inspired by a Hand-Powered Spinning Top

Design and Application of Portable Centrifuge Inspired by a Hand-Powered Spinning Top

Effect of photoperiod on the anxiety of zebrafish

Towards a Sustainable Nutrition Paradigm in Physique Sport: A Narrative Review

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