B Mirzaei; A barjaste; F Rahmani-nia
Abstract
Aim: This study aimed to examine the effect of aerobic exercise with and without BFR on blood lactate, cortisol and PGC-1α response in human skeletal muscle.
Method: On two different occasions, five healthy untrained male subjects (mean±SE; age: 33.4±1.02 years, height: 173.9±4.02 ...
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Aim: This study aimed to examine the effect of aerobic exercise with and without BFR on blood lactate, cortisol and PGC-1α response in human skeletal muscle.
Method: On two different occasions, five healthy untrained male subjects (mean±SE; age: 33.4±1.02 years, height: 173.9±4.02 cm, body mass: 79.64±4.69 kg), were required to perform (i) a BFR aerobic exercise at an exercise intensity of 40 % of VO2max; and (ii) similar exercise bouts without BFR (Ctrl). For each condition, baseline and 3 h post-exercise muscle biopsy samples (vastus lateralis) were performed for PGC-1α protein expression analysis. Venous blood samples were also collected at pre-exercise, immediately and 2 h post-exercise to measure changes in blood lactate and serum cortisol.
Results: PGC-1α protein content was significantly higher (P < 0.05) at 3-h post-exercise with BFR compared with Ctrl. Blood lactate and serum cortisol did not significantly change from baseline to immediately after exercise and at 2-h post exercise.
Conclusion: Metabolic stimuli are not a mechanism to mediate cell signaling network responsible for mitochondrial biogenesis. However, the addition of blood flow restriction during aerobic exercise induces an increase in PGC-1α to regulate mitochondrial biogenesis.
J Vakili; f Halal Khor; M Aghaei
Abstract
Aim: : Exercise training with blood flow restriction (BFR)is a modern method of training that has been developed in two recent decades and has been used for improvement of performance. Therefore, this study was conducted to identify the effect of 4 weeks rock climbing with blood flow restriction on athletic ...
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Aim: : Exercise training with blood flow restriction (BFR)is a modern method of training that has been developed in two recent decades and has been used for improvement of performance. Therefore, this study was conducted to identify the effect of 4 weeks rock climbing with blood flow restriction on athletic performance and some muscle damage indictors in elite rock climbers. Method: : In a semi experimental research method, 12 male and 12 female elite rock climbers with at least 4 years rock climbing experience and age range of 23 to 27 years and a fat percentage of 10 to 20 percent purposefully selected among the climbers, and allocated in two equal BFR and none-BFR groups. Both groups performed 4-week rock climbing training program consisting three sessions per week and each session was 90 minutes, severity of each session was 60 to 80% of climbing grades. Blood samples were obtained in baseline and after four weeks of climbing training to determine the amount of lactate dehydrogenase (LDH), creatine kinase (CK) and lactate. Also, hand grip, explosive anaerobic power, body fat percent, adduction strength in upper body and degree of climbing was measured. For data analysis, independent T test was used at α ≤ 0.05. Results: After 4 weeks of climbing with and without limitation of blood flow, the index of muscular damage of LDH, CK did not show significant difference in response to climbing exercise. But lactate level was lower in BFR rather than NBFR. There are not any difference in Hand Crip strength, explosive anaerobic power, body fat percent, adduction strength in upper body between BFR and NBFR groups. But in degree of climbing, the result showed the better performance in BFR than NBFR (P <0.05). Conclusion: According to the results of this study, rock climbing training with or without BFR, do not increase muscular damage. and it could influence on performance.
A Farzaneh Hesari; S A Hosseini-Kakhk; M R Hamedinia
Abstract
Aim: The purpose of this study was to determine the effect of ischemic preconditioning (IPC) in different time periods and limbs on lactate and rating the perceived exertion after strenuous exercise in judoists.
Method: In a randomized, crossover study, 13 male judo athletes were volunterd (more than ...
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Aim: The purpose of this study was to determine the effect of ischemic preconditioning (IPC) in different time periods and limbs on lactate and rating the perceived exertion after strenuous exercise in judoists.
Method: In a randomized, crossover study, 13 male judo athletes were volunterd (more than 4 years of judo practice) took part in this study and performed two spacial judo fitness test (SJFT) with 90 second between trials in seven conditions: IPC in hands 5 and 20 min before exercise, IPC in legs 5 and 20 min before exercise, IPC in hands and legs 5 and 20 min before exercise and a sham intervention. IPC treatment consisted of 3, 5 min bouts of ischemia, followed each by 5 min of reperfusion. Rating the perceived exertion immediately after each test and lactate response were measureal after 5, 10 and 15 min of exercise. One-way repeated measures ANOVA and Bonferroni post-hoc test used.
Results: IPC in hands and legs 20 min before exercise decreased lactate accumulation in 10 and 15 min after exercise and rate of perceives exertion than sham condition.
Conclusion: If remote ischemic preconditioning applied in more muscular mass and 20 min before exercise, it improves lactate metabolism and rating of perceived exertion in judo athletes.
Nahid Bijeh; Saeed Ramezani; Babi San Askari; Asra Askari
Volume 4, Issue 1 , May 2014, , Pages 69-80
Abstract
Aim: Recently, energy drink consumption by athletes has become increasingly popular. Athletes believe that energy drinks can be used to enhance their performance during training and competition due to their potentially ergogenic ingredients such as carbohydrates, caffeine, sodium and taurine, among others. ...
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Aim: Recently, energy drink consumption by athletes has become increasingly popular. Athletes believe that energy drinks can be used to enhance their performance during training and competition due to their potentially ergogenic ingredients such as carbohydrates, caffeine, sodium and taurine, among others. Therefore, the purpose of this study was to determine the effectiveness of the acute ingestion of a taurine and caffeine-containing drink on Wingate cycle performance and blood lactate levels in active men. Method: A sample of 19 active male students (age: 8/0±3/22years, height7/6±2/71: cm, weight: 4/5±9/175kg) from Mazandaran University were selected. This research was conducted on two separate sessions with four days rest in between. In the first session, all of the subjects participated in the Wingate test, after having a standard breakfast, and after the blood taking (before and 2 min after test) and hand muscle esterangth measurement. In the second session, subjects were randomly divided in three groups (taurine and caffeine-containing drink, placebo and no drink groups). Immediately after having breakfast (forty minutes prior to test beginning), each group received 6 ml/kg.bw of related beverages. Results: In the taurine and caffeine-containing drink group, minimum (p=0/017) and mean (p=0/029) power was increased and blood lactate before (p=0/357) and after (p=0/920) the test, was unchanged Conlusion: In conclusion a commercially-available taurine and caffeine-containing drink (Red Bull) enhances anaerobic power of active male.
