[Effects of exercise on memory retrieval in passive avoidance learning in young male wistar rats]

Exercise seems to be a simple and widely practiced behavior that activates molecular and cellular signaling cascades involved in various central nervous system processes. There has been more attention to the effects of exercise on nervous system and memory during recent years. So, we decided to examine the effects of treadmill exercise on memory consolidation and retrieval in young rats by passive avoidance learning. In this study fifty male Wistar rats [3-4 months old] were randomly divided into five groups [n=10]. Those in the control group were trained in passive avoidance box and tested 10 min, 24 hrs, 10 days and 3 months later. Two groups exercised in treadmill one hour at 17 m/min for 10 days and 3 months respectively and then were trained in passive avoidance box and tested 10 min and 24 hrs later. Data were analyzed using T and paired T tests. The other two groups for research effects of exercise in memory retrieval first were trained and tested 10 days and 24 hrs later and then exercised in treadmill like the other two groups; the latter groups were tested after exercise. The obtained results showed that short-term [10 days] and long - term [3 months] exercise before training had significant [P<0.05] effects on memory consolidation in passive avoidance learning, but no difference was observed in latency time in passive avoidance between short - term [10 days] and long - term [3 months] exercise groups after training with before exercise. Our results showed that physical activity produced a significant enhancement on learning and memory consolidation but there were no significant effects on memory retrieval

Effect of aerobic exercise on memory consolidation in male young rats

Effects of exercise and physical activity on function of different organs of body like heart, lung and muscles have been the focus of interest since many years ago. During the recent years more attention is paid to the effects of exercise on nervous system and memory. The role of exercise on memory consolidation is a controversial issues. So we decided to examine the effects of treadmill exercise on memory consolidation by passive avoidance learning. In this study thirty male Wistar rats [3-4 months old] randomly were divided into three groups was of ten. Control group were trained in passive avoidance box and was tested in 10 min and 24 hours intervals. Two experimental groups exercised in treadmill for 10 days and 3 months respectively and then were tested same as control group. Obtained results showed that both short and long - term exercise trainings had significant [p<0.05] effects on memory consolidation in compare with control group. Our results showed that physical activity may enhance learning and memory consolidation significantly

combined effects of exercise and post dehydration water drinking on plasma argenine vasopressin, plasma osmolality and body temperature in healthy males

The purpose of this study was to investigate the effect of exercise and post dehydration water drinking on variations in plasma arginine vasopressin [PAVP], plasma osmolality [Posm] and tympanic temperature [Ttym] in healthy males. Eight healthy young males [27.4 +/- 0.8 yrs old] volunteered for the study. They performed constant work exercise, at a rate of 60 rpm at 50% of individual work load for VO2 peak for 30 minutes. Six blood samples [at minutes 0, 15 and 30 during exercise and at minutes 3, 15 and 30 after termination of exercise] were obtained through an indwelling venous cannula. Plasma concentrations for Na+, and AVP were determined. Posm was calculated using Na+ concentrations. Simultaneous variations in Ttym were also determined. Our results demonstrated a positive correlation between increase in PAVP and both Posm and Ttym during exercise but not during the recovery period. When exercise was combined with water drinking a fast and significant suppression in PAVP occurred [P<0.05]. These results suggest that Posm and Ttym have no significant effect on AVP secretion post exercise, and thus other factors must be involved in AVP secretion during post exercise recovery period