This study aimed to analyze the effects of using bioceramic clothing on the 10 km running performance. Ten healthy young males (age 27.9 ± 4.2 years; height 1.8 ± 0.1 m; body mass 73.0 ± 7.5 kg; body mass index (BMI) 23.5 ± 2.3 kg·m2 and body fat 19.3 ± 4.2 %) volunteered to participate in the study. The participants visited the track for three 10 km performances under different conditions: bioceramic clothes (CER), placebo (PLA) and personal clothes (C). Test order was randomized and subjects were blind to the intervention condition, except for the C. Friedman’s test or ANOVA for repeated measures were used to compare the conditions. Minimal detectable change and Effect Size were also calculated. Results: No statistical differences were found. Minimal detectable change analysis suggested a “Possible” reduction in time for the CER condition (C – 52.3 ± 4.1; PLA – 53.1 ± 5.0; CER 51.4 ± 3.8 minutes). Lactate concentration analysis showed a faster removal when subjects were using bioceramic clothes. DOMS was rated as “Possible” higher in the CER condition, and the Session Rate of Perceived Exertion (RPESession) was also higher in that condition, rated as “Small” through Cohen’s Effect Size analysis (C – 425.7 ± 74.8; PLA – 426.6 ± 87.5; CER – 440.1 ± 42.5 A.U.). Conclusion: Results suggest that the use of bioceramic clothes might improve running performance. Further studies are necessary to determine ideal dosage such as time of use and factors influencing absorption.
RESUMO:A mensuração do lactato sanguíneo com determinação do limiar anaeróbio é uma forma simples e difundida de avaliar o desempenho físico. O lactato é o produto final da glicólise anaeróbia, um dos processos geradores de energia no corpo humano, junto com os sistemas dos fosfagênios e aeróbio. A contribuição relativa de cada um deles para as demandas energéticas do músculo esquelético depende do tipo, intensidade e duração do exercício, e o lactato é uma forma de medir essa contribuição. Há intensa transferência de lactato entre tecidos e dentro das células musculares. O propósito desta revisão é interligar esses aspectos em uma estrutura coerente a partir da qual novas hipóteses possam ser exploradas. Foram consultados artigos das bases PubMed e Scielo usando os termos treinamento, performance, lactato e metabolismo e livros de fisiologia. O metabolismo sistêmico de lactato e a variação sanguínea do lactato, registrada em avaliações de desempenho, são aspectos inter-relacionados do mesmo processo fisiológico. PALAVRAS-CHAVE: Ácido láctico; Metabolismo energético; Desempenho atlético LACTATE METABOLISM AND PERFORMANCE ASSESSMENT: T WO SIDES OF THE SAME PROCESS ABSTRACT:The measuring of blood lactate to determine anaerobic threshold is the commonest method to evaluate physical performance. Lactate is the final product of anaerobic glycolysis, one of the energy -producing processes in the human body, coupled to phosphagenic and aerobic systems. Since relative contribution of each for energy demands of the skeleton muscle depends on the type, intensity and duration of the exercise, lactate measures such contribution. There is intense transfer of lactate among tissues and within muscle cells. This review interlinks the above aspects within a coherent structure so that new hypotheses may be taken. Physiology textbooks and articles from PubMed and Scielo databases were consulted by employing the terms training, performance, lactate and metabolism. Lactate systemic metabolism and lactate blood variation registered in performance assessments are inter-related aspects of the same physiological process.
-Aims:The use of electromagnetic waves by phototherapy to skeletal muscle presents potential ergogenic effects. The aim of this study was to analyze the effect of using bioceramic clothes on performance, heart rate (HR) and rate of perceived exertion (RPE) during a 10 km race. Our hypothesis is that the use of such clothes modifies these variables. Methods: Participants were 10 runners (27.9 ± 4.2 years) who performed two 10 km performances on track under different intervention conditions: bioceramic garments (CER) and placebo garments (PLA). The mean velocity (MV), HR and rate of perceived exertion (RPE) were monitored at each trial. Additionally, partial MV was calculated in three phases: (1) start (first 400 m), (2) middle (400-9600 m) and (3) end (last 400 m). Results: MV in CER condition was significantly higher than in PLA condition (11.8 ± 1.0 km·h -1 vs 11.4 ± 1.2 km·h -1 ; F = 6.200; P = 0.034; ŋ p ² = 0.408). HR and RPE values in CER condition were not different from PLA condition. Conclusions: Our main finding was that the use of bioceramic clothes (CER) increased MV when compared to the PLA condition. Based on these results, bioceramic may be used as an ergogenic resource to increase performance.
The purpose was to determine the possible effects of exercise and/or caffeine on hypoglycemia and liver gluconeogenesis in diabetic rats. These were divided into four subgroups: (a) intraperitoneal insulin only, (b) exercise bout before insulin, (c) caffeine after insulin, and (d) exercise bout before and caffeine after insulin. The marked glycemic drop 45 min after insulin (0 min = 229.00, 45 min = 75.75) was considerably reduced (p < 0.05) by caffeine or exercise (45 min: exercise = 127.00, caffeine = 104.78). However, this systemic effect was lost (p > 0.05) when they were combined (45 min: exercise + caffeine = 65.44) (Mean, in mg·dL). Caffeine alone strongly inhibited liver glucose production from 2 mM lactate 45 min after insulin (without caffeine = 3.05, with caffeine = 0.27; p < 0.05), while exercise + caffeine partially re-established the liver gluconeogenic capacity (exercise + caffeine = 1.61; p < 0.05 relative to the other groups) (Mean, in μmol·g −1 ). The improved hypoglycemia with caffeine or exercise cannot be explained by their actions on liver gluconeogenesis. As their beneficial effect disappeared when they were combined, such association in diabetic patients should be avoided during the period of hyperinsulinemia due to the risk of severe hypoglycemia.
The effects of training on fat and muscle were not maintained after detraining, but low-dose ND had persistent effects on the reproductive structures.
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