scholarly journals Sodium and potassium content in sports supplements based on whey protein

2020 ◽  
Vol 75 (1) ◽  
pp. 34-44
Author(s):  
Thalles Pedrosa Lisboa ◽  
Rafael Arromba de Sousa

Diferentes marcas de três tipos de suplementos esportivos à base de proteína de soro de leite foram avaliadas: 15 do tipo à base de proteína de soro de leite, 4 "hipercalóricos" e 7 barras de proteína. Um procedimento de preparo de amostras foi estudado empregando digestão ácida assistida por micro-ondas para determinar os teores de sódio e potássio usando Espectrometria de Emissão Atômica com Chama (Fotometria de Chama). As concentrações de sódio obtidas variaram na faixa de: 0,30 a 5,9 mg/g, de 0,52 a 2,8 mg/g e de 2,3 a 5,0 mg/g para suplementos a base de proteínas do soro de leite, suplementos hipercalóricos e suplementos em barra de proteína, respectivamente. Enquanto as concentrações de potássio, variaram de: 1,3 a 13 mg/g, de 0,47 a 5,4 mg/g e de 1,7 a 12 mg/g para as mesmas amostras, respectivamente. A razão entre os níveis de sódio e potássio, um parâmetro associado à hipertensão incidente, foi calculada e mostrou que, para algumas amostras, os valores excederam a recomendação da Organização Mundial de Saúde. O método desenvolvido apresentou alta frequência analítica, com boa exatidão e precisão sendo adequado para aplicação em rotinas de controle de qualidade.

Author(s):  
Fernando Mata ◽  
Raúl Domínguez ◽  
Álvaro López-Samanes ◽  
Ángela Sánchez-Gómez ◽  
Pablo Jodra ◽  
...  

Abstract Background The aim of this study was to analyze the consumption of sports supplements (SS) in competitive level fencers and compare differences based on sex and competitive level (international and national). Methods A total of 49 fencers (18 men and 31 women) of national (n = 16) and international (n = 33) level completed a questionnaire with questions about SS consumption and the possible repercussions on health and / or sports performance. The results were analyzed based on the different categorizations established by the Australian Institute of Sport (AIS), as well as by sex and level of competence to which the participants belonged to. Results 46.9% of fencers have consumed SS with the main motivation being performance improvement (34.2%). Medical doctors were the individuals who were more likely to advise men to consume SS (50.0% vs 5.6%; OR = 3.29 [1.50–7.20]). Friends were most likely to advise women (38.9% vs 8.3%; OR = 1.75 [1.05–2.93]). The most consumed SS were sport drinks (44.9%), vitamin C (43.4%), sport bars (38.8%), and caffeine (28.6%). In regards to the SS categories, it was observed differences in the interaction level·sex in medical supplements (p = 0.017). In addition, there was a higher prevalence of whey protein consumption in women (25.8% vs 0%; p = 0.020) and iron consumption in men (33% vs 6.5%; p = 0.039). Conclusions The prevalence of SS use in fencers is within the values previously reported in athletes of the same competitive level. There were no differences by sex and competitive level in the total consumption of SS, nor in each of the groups of level of evidence, being sport drinks, bars and caffeine the most consumed SS.


1981 ◽  
Vol 62 (5) ◽  
pp. 34-36
Author(s):  
E. S. Halfen ◽  
A. D. Tryapyshko

Comparison of electro-gustometry data and the results of blood glucose studies, sodium and potassium content in saliva and blood, daily excretion of 17-ketosteroids in healthy and sick patients showed that electro-gustometry can be used as a simple approximate method for detecting adrenal insufficiency.


1939 ◽  
Vol 16 (2) ◽  
pp. 178-183
Author(s):  
D. A. WEBB

The sodium and potassium content of sea water have been re-determined. The following values are suggested: K/Cl=0.02009±0.0002; Na/Cl=0.5549±0.001.


1963 ◽  
Vol 61 (3) ◽  
pp. 409-410 ◽  
Author(s):  
R. A. Lawrie ◽  
R. W. Pomeroy

1. The sodium and potassium content of longissimus dorsi (lumbar), psoas major, rectus femoris, triceps (lateral head) and extensor carpi radialis from 6 pigs each at pork, bacon and manufacturing weights were determined: these varied significantly and systematically between muscles and between groups.2. Since the concentration of potassium may differ by at least 30% between muscles, it is concluded that assessment of total muscle mass may be inaccurate if based on the integration ofγ-ray emission from 40K.


1957 ◽  
Vol 189 (3) ◽  
pp. 451-454 ◽  
Author(s):  
Louis Tobian ◽  
Paul D. Redleaf

Administration of desoxycorticosterone and NaCl resulted in an increased sodium and potassium content of the aorta in rats becoming severely hypertensive. Equivocally hypertensive animals on this regimen showed smaller increases in sodium and a decrease in potassium. Sodium restriction prevented both hypertension and changes in arterial wall chemistry from occurring in rats receiving desoxycorticosterone. Hypertension per se may be fundamentally associated with an increased potassium and sodium content in artery, as experimental renal hypertension is characterized by a similar electrolyte alteration.


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