[ effect of acute L-carnitine supplementation on the blood lactate, glucose, VO[2max] and power in trained men: a brief report]

Probably L-Carnitine can induce increasing of Pyruvate dehydrogenase activity, decreasing of lactic acid production and performance improvements due to the reinforcement of long chain fatty acid oxidation and stabilize of Coenzyme A [CoASH] to free Coenzyme A [COA]. Based on this, the aim of this study was to investigate the effect of acute L-Carnitine supplementation on blood lactate, glucose, VO[2max] and anaerobic power in trained men. Sixteen trained men [aged 19-23] volunteers from University of Guilan, faculty of Physical Education and Sport Sciences participated as subjects in this investigation. Subjects divided to aerobic [A] and anaerobic [An] group randomly. In a double blind design, subjects participated in two separated tests by one week. Subjects ingested 3 grams of L-Carnitine supplementation or placebo [maltodextrin] 90 minute before aerobic and anaerobic exercise. For aerobic activity used shuttle run 20 meter and for anaerobic activity used RAST test. Blood samples were collected 5 minute prior at rest and 4 minute post tests. Participants were asked in the morning to obtain fasting blood samples and perform tests. A t-test was used to detect differences between supplementation and placebo groups in each exercise. L-Carnitine group [[A] 141.25 +/- 20.62 and [An] 145.38 +/- 55.47] significantly had lower lactate concentration than placebo [[A] 151.00 +/- 20.85 and [An] 152.50 +/- 28.59] after tests [P

Effects of different rest intervals between circuit resistance exercises on post-exercise blood pressure responses in normotensive young males

To investigate the blood pressure responses during recovery after two protocols of circuit resistance exercises [CRE] with different rest intervals [RI]. Eleven normotensive males [aged 19.5 +/- 1.0 yrs, height 172.8 +/- 5.7 cm and weight 65.1 +/- 8.1 kg] performed two CRE with RI of 30 [RI30s] and 40 [RI40s] seconds between the exercises randomly, as well as a control session without exercise. The protocols consisted of 3 circuits of 6 exercises with 10 repetitions maximum [10RM] and 2 minute rest between circuits, followed by an 80 minute recovery period. Measurements were taken before exercise and at each 10 min of post-exercise recovery. The Analysis of Variance [ANOVA] with Repeated Measures [group x time] was used to analyze data, followed by posthoc Bonferroni test, for P < =0.05. Post-exercise hypotension of systolic blood pressure was observed after both CRE with RI30s and RI40s [at R40, R50, R60, R70 and R80], whereas diastolic blood pressure did not differ from that measured at rest. In all measured moments, there was no significant difference between exercise trials in post-exercise levels of systolic and diastolic blood pressure. CRE with RI30s and RI40s between the exercises can lead to occurrence of PEH similarly in magnitude and duration. Our findings suggest a potentially positive health benefit of strength training