Results 21 to 30 of about 47,224 (264)

New Insights into the Metabolism of Methyltestosterone and Metandienone: Detection of Novel A-Ring Reduced Metabolites

Molecules, 2021
Metandienone and methyltestosterone are orally active anabolic-androgenic steroids with a 17α-methyl structure that are prohibited in sports but are frequently detected in anti-doping analysis.
Steffen Loke, Lingyu Liu, Maxi Wenzel, Heike Scheffler, Michele Iannone, Xavier de la Torre, Nils Schlörer, Francesco Botrè, Annekathrin Martina Keiler, Matthias Bureik, Maria Kristina Parr   +10 more
doaj   +1 more source

An Intramuscular Injection of Mixed Testosterone Esters Does Not Acutely Enhance Strength and Power in Recreationally Active Young Men

Frontiers in Physiology, 2020
Purpose: Limited data are available on the acute performance-enhancing effects of single-dose administration of testosterone in healthy humans. Studies of testosterone administrations to healthy humans are rare due to the difficult nature and necessity ...
Sara Amalie Solheim, Sara Amalie Solheim, Jakob Mørkeberg, Anders Juul, Stine Yde Freiesleben, Emmie N. Upners, Yvette Dehnes, Nikolai Baastrup Nordsborg   +7 more
doaj   +1 more source

DEVELOPMENT OF A TECHNIQUE FOR THE MASS-SPECTROMETRIC DETERMINATION OF GONADOTROPIN-RELEASING HORMONE AND ITS ANALOGS FOR DOPING CONTROL

Тонкие химические технологии, 2017
In the present study, a rapid, sensitive, and selective method for determination of several synthetic analogues of gonadotropin-releasing hormone in human urine by solid-phase extraction and ultraperformance liquid chromatography coupled to tandem mass ...
K. M. Shestakova, G. A. Dudko, M. A. Dikunets   +2 more
doaj   +1 more source

Prevalence and patterns of dietary supplement use in elite Spanish athletes

Journal of the International Society of Sports Nutrition, 2019
Background Dietary supplementation is a common strategy to achieve a specific health status or performance benefit. Several investigations have focused on the prevalence of dietary supplement use by athletes.
Gabriel Baltazar-Martins, Diego Brito de Souza, Millán Aguilar-Navarro, Jesús Muñoz-Guerra, María del Mar Plata, Juan Del Coso   +5 more
doaj   +1 more source

Bioanalytical Detection of Steroid Abuse in Sports Based on the Androgenic Activity Measurement

Chemosensors, 2021
The anabolic androgenic steroids (AAS) are the most frequently consumed performance enhancing drugs (PED) in sports. In the anti-doping field, the detection of AAS is carried out by the analysis of the athlete’s urine using methodologies based on liquid ...
Pilar Martín-Escudero, Jesus A. Muñoz-Guerra, Soledad Vargas García-Tenorio, Ester Serrano-Garde, Ana Belén Soldevilla-Navarro, Nuria Cortes-Carrillo, Mercedes Galindo-Canales, Nayade del Prado, Manuel Fuentes-Ferrer, Cristina Fernández-Pérez, Peter Alexander Behnisch, Abraham Brouwer   +11 more
doaj   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

Stressing the limits of capillary blood in anti-doping analysis: perspectives on alkylamine-like stimulants and carbonic anhydrase II inhibitors in result management

Frontiers in Sports and Active Living
The establishment of an anti-doping rule violation extends beyond the mere detection of a prohibited substance. Current interpretation criteria rely primarily on urinary concentration estimates, which may be misleading due to high interindividual ...
Isabelle Karine da Costa Nunes, Mariana Vaz Carneiro, Felipe Alves Gomes de Oliveira, Ana Carolina Dudenhoeffer Carneiro, Carina de Souza Anselmo, Christian Farias Trajano, Monica Costa Padilha, Henrique Marcelo Gualberto Pereira   +7 more
doaj   +1 more source

Thermodynamic Pathways of Nonequilibrium Solidification in Wire‐Arc Additive Manufacturing Fe‐Based Multicomponent Alloy Structures

Advanced Engineering Materials, EarlyView.
Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios, Anthony Gonzalez, Aleksander Aleman, Tyler Dolmetsch, Tanaji Paul, Arvind Agarwal   +5 more
wiley   +1 more source

Gel card kit to detect recent homologous blood transfusion for anti-doping purpose. A proof of concept and assessment of limitations

Frontiers in Sports and Active Living
Homologous blood transfusion (HBT) is used illicitly by some athletes to increase red blood cell (RBC) mass. The cytofluorometric techinique detects HBT by distinguishing between two different RBC populations.
Pedro Antônio Castelo Teixeira, Rachel Santos Levy, Tiago Ascenção Barros, Allan de Oliveira de Azevedo, Monica Costa Padilha, Henrique Marcelo Gualberto Pereira   +5 more
doaj   +1 more source

Influence of lactic-acid bacteria feed supplementation on free amino acid levels in serum and feces of rainbow trout (Oncorhynchus mykiss, Walbaum 1792)

Frontiers in Marine Science, 2023
IntroductionThe influence of intestinal microbiota, particularly lactic-acid bacteria, on digestion and nutrient metabolic activities has been extensively studied.
Gabriel R. A. Carneiro, Constanza Opazo, Gustavo Ramalho Cardoso Do Santos, Henrique Marcelo Gualberto Pereira, Gustavo Monnerat, Gustavo Monnerat, Rafael Opazo   +6 more
doaj   +1 more source