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Showing 7 results for Subject: Physiology

Jamshir M, Hosseini Sm (phd), Hajimashhadi Z (msc), Azimi H,
Volume 13, Issue 3 (10-2011)
Abstract

Background and Objective: The reactive oxygen species (ROS) continuously are neutralized by antioxidant. Biological molecules become protected from oxidative stress under normal conditions. The production of ROS during hypoxia is reported In Vitro which is also known as reductive stress. In order to study this phenomenon at physiologic scales which occurs in routine activities, this study was conducted to evalute, the effect of voluntary apnea on serum ROS level. Materials and Methods: In this semi-experimental study, the participants were 12 healthy non-athlete men aged 21±3 years. At the end of normal depth inspiration the voluntary apnea had been started till 40 seconds. The respiratory rate and depth, heart rate and arterial oxyhemoglobine saturation percent were continuously monitored. Venous blood samples were collected at two times: (1) immediately after the apnea and (2) at the end of it and before re-breathing. The serum ROS level was measured using the standard D-ROM test. Results: The mean and the range of breath holding time were 52.5±7.9 and 40±61.7 seconds respectively. The heart rate and the arterial oxyhemoglobine saturation percent decrease 12.75% (P<0.003) and 2.05% (P<0.001) respectively. The mean and the range of basal vs. apnea of these parameters were as follow: 93.3±3.03 and 87-107 bpm vs. 81.43±3.7 and 71-93 bmp 97.6±.16 and 97-98 percent vs. 95.6±.33 and 94-97%. The serum ROS level after 40 seconds of apnea did not show significant differences. Conclusion: In non-athletes the voluntary apnea had no effect on serum reactive oxygen species level.
Janzadeh A (msc), Nasirinezhad F (phd), Jameie Sb (phd),
Volume 14, Issue 1 (3-2012)
Abstract

Background and Objective: Oxidative stress is known as the one of the causes of neuropathic pain, reactive oxygen species (ROS) has been reported to be involved in this process. Coenzyme Q10 acts as an antioxidant and is able to reduce resulting oxidative damage. This study was done to determine the effect of Coenzyme Q10 on neuropathic pain in CCI (Chronic Crash Injury) rat model.

Materials and Methods: In this experimental study 30 male rats (200-250g) randomizely allocated into 3 groups each 10 rat including CCI, CCI + CoQ10 and CCI + vehicle. Neuropathic pain, was induced by Chronic Crash Injury (CCI) model for sciatic nerve. IP injection of CoQ10 (200 mg/kg) or vehicle was done daily for 10 days. Behavioral tests were done before and after surgery on day 5 and 10 respectively. Paw withdrawal threshold was assessed by Randall Selitto test, Analgesy Metter and Von Frey filaments. Data was analyzed by SPSS-14, Independent T and Mean-whatney tests.

Results: Induction of nerve injury decreased pain threshold (P<0.05) and treatment with CoQ10 increased mechanical and thermal threshold in neuropathic rats compared to CCI animals (P<0.05). There was a significant difference in pain threshold between animals treated CoQ10 and vehicle injected animals (P<0.05).

Conclusion: This study indicated that coenzyme Q10 prevents deleterious effects following nerve injury in animal model.


Askari A (msc), Askari B (msc), Fallah Z (phd), Kazemi Sh (bsc),
Volume 14, Issue 1 (3-2012)
Abstract

Background and Objective: Cardiovascular diseases are the most significant factors leading to death. This study was done to determine the effect of eight weeks aerobic training on level serum lipid and lipoprotein in non athletic women.

Materials and Methods: This quasi-experimental study was carried out on 30 non athletic women. Subjects were devided into control and experimental groups through gained Vo2max. HDL-c, total cholesterol (TC), LDL-c, VLDL-c, RF (TC/HCL) and subdermal fat percent were evaluted perior and after training for eight weeks as follow: three session in each weeks with one hour aerobic training in each session. Data analyzed using SPSS-14 and independent and dependent T student tests.

Results: The significant reduction of RF, TC and percent of subdermal fat were observed in experimental group after training in comparison with prieor phase (P<0.05). Significant reduction of RF, LDL-C, TC and subdermal fat were observed in experimental group in comparison with contols after training (P<0.05). The increase of HDL-c and reduction of TG and VLDL-c were observed in experimental group compared to control but these differences were not significant.

Conclusion: This study showed that aerobic training reduce total cholesterol, LDL-c, RF and percent of subdermal fat in non athletic women.


Farajdokht F, Soleimani M, Mehrpouya S, Barati M, Nahavandi A,
Volume 15, Issue 2 (7-2013)
Abstract

Background and Objective: The first effect of stress on the immune system is usually a rapid increase in function which manifests itself by an increase in the number of inflammatory cytokines in blood. It is however, followed by a decrease of function in immunological response. During inflammation, the expression of hepcidin gene is increased in order to keep iron away from pathogens. This study was conducted to determine the effect of chronic mild stress on the expression of hepcidin gene in the hippocampus of the male adult rats. Materials and Methods: This experimental study was carried out on 30 adult male Wistar rats, weighing approximately 200-250 grams. They were randomly allocated into two groups of 15 rats: control and chronic mild stress group. Animals in intervention group were exposed to chronic mild stress for 3 weeks. At the end of the stress protocol, 2 ml blood sample was collected to measure the serum concentration of IL-6. Real time PCR method was used to investigate hepcidin expression in hippocampus. Data were analyzed using SPSS-16 and independent t-test. Results: The mean level of IL-6 was significantly higher in the CMS exposure group (27.98±0.84 pg/ml) than control group (18.29±1.18 pg/ml) (P<0.05). Hepcidin expression in the hippocampus of intervention group was significantly higher (2.69±0.226%) in compared to control group (1±0.105) (P<0.001). Conclusion: This study showed that chronic mild stress increases the expression of hepcidingene and the serum level of IL-6 in adult rats.
Eslami R, Gharakhanlou R, Mowla J, Rajabi H, Mohammadkhani R,
Volume 16, Issue 1 (3-2014)
Abstract

Background and Objective: Trophic factor family plays a key role for neuromuscular system healthy. This study was carried out to determine the effect of one session of resistance exercise on protein content and mRNA expression of NT4/5 in rat slow and fast muscles. Methods: In this experimental study, sixteen adult male rats randomly were allocated into resistance exercise (T) and control groups. The resistance training protocol consisted of climbing a 1-meter–long ladder, with a weight attached to a tail sleeve. Quantitative Real time RT-PCR for NT-4/5 expression and ELISA Kit for protein assay were used. Results: Resistance training significantly decreased mRNA expression and increased protein of NT4/5 in soleus muscle (P<0.05). Significant alteration was not detected in flexor hallucis longus muscle. Conclusion: One session of resistance training can alter protein and mRNA of NT-4/5 in skeletal muscle and this alteration was dependent on muscle type.
Mirdar Sh, Jarrahi M, Hedayati M, Hajizade A, Hamidian Gh,
Volume 16, Issue 4 (12-2014)
Abstract

Background and Objective: The kidney has a key role in homeostatic regulation. Vascular endothelial growth factor (VEGF) is essential regulator of stimulatory and inhibitory processes for neonatal, post-natal endothelial cell differentiation. This study was done to determine the effect of maternal swimming during pregnancy on VEGF level of kidney in rat pups. Methods: In this experimental study, sixteen Wistar rat dams were allocated into interventional swimming and control groups. In the first day of pregnancy, in interventional group, swimming was performed for 30 minutes a day and 5 minutes every day was added until the time of training gradually reached to one hour per workout. Dams swimming endurance training were performed in 5 days per week for three weeks. Pups’ kidneys were removed two days after birth and kindney tissue VEGF level was determined using ELISA method. Results: Kidney tissue VEGF level in interventional swimming group (133.13 pg/ml) was significantly increased in compared to controls (48.19 pg/ml) (P<0.05). Conclusion: Swimming endurance training increases the pups’ kidney VEGF level.
Mohamad Fayaz , Mahsa Amiri Resketi , Vahid Tajari , Seyed Mehran Hosseini ,
Volume 24, Issue 3 (10-2022)
Abstract

Background and Objective: Reaction time measures have considerable potential to aid neuropsychological assessment in a variety of healthcare settings. One such measure, the intra-individual reaction time variability is of particular interest as it is thought to reflect neurobiological disturbance. The present study aimed to investigate the intra-individual changes in reaction time to visual stimuli in dominant or non-dominant binocular and monocular vision.
Methods: This descriptive-analytical study was conducted on 12 volunteers with an average age of 30.08±1.448 years in 2021. The subjects consisted of the students and staff of Golestan University of Medical Sciences (5 female and 7 male). The reaction time was recorded automatically by the hand reaction time device of Danesh Salar Iranian Company based on the time of presentation of visual stimulation on the computer screen and the person's reaction, i.e. pressing the buttons of the handles by each of the two hands. All experiments were performed between 10 and 11 am and following at least 2 hours of fasting. Data collection was done following training trials for correct performance of the 2-choice reaction time test. After completing the reaction time tests for each volunteer, the dominant eye was determined by the hole-in-card method.
Results: In 4 volunteers, the dominant eye was left and in the rest of the volunteers, the dominant eye was right. The dominant eye did not differ between men and women. The number of reaction times recorded in right monocular vision left monocular vision and binocular vision were 902, 911 and 893, respectively. The mean reaction time in right monocular vision, left monocular vision and binocular vision was 306.81±3.310, 304.28±3.339 and 312.95±4.569, respectively, and the range of reaction times in these three states was between 194-1750, 178-1587, and 155-1797 ms, respectively. Intra-individual reaction time variability in the dominant left eye and left hand were significantly lower compared to the dominant right eye and right hand, respectively (P<0.05). No difference was observed between the reaction time of the right monocular vision, left monocular vision, and binocular vision.
Conclusion: The alignment of the dominant left side in the eye and hand reacts faster than the dominant right side in the eye and hand. The mechanism of this phenomenon may be related to the overall process that determines the dominant left hemisphere in approximately 90% of the population.
 

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مجله دانشگاه علوم پزشکی گرگان Journal of Gorgan University of Medical Sciences
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