جستجوی مقالات مرتبط با کلیدواژه "active girls" در نشریات گروه "تربیت بدنی"

The aim of the present study was to determine the effects of 12 sessions plyometric training on happiness levels of active girls.

The statistical population of this study included all female students of physical education at Mazandaran University that out of 34 volunteers to perform the training based on the entry conditions, 15 person (age: 21±2.33 years) were randomly selected for the experimental group and 15 person (age: 21/4±2.62 years) for the control group. After 2 weeks introduction course and education executive techniques, training programs subjects was include progressive plyometric training that performed 3 days in week. The first each session was conducted 15 min stretching movements and slow run in order to warm-up. Then the main program include plyometric training for 60 minutes and at the end 5 minutes were allocated to cool-down. Information on happiness levels was obtained before and after the training by the Oxford Happiness Questionnaire (OHQ) containing 29 items. Dependent and independent T-test were used with SPSS version 19 for analyzing data

The results of the dependent T test showed that there was a significant difference on happiness levels of active girls after 4 weeks of polymeric training in the experimental group (p=0.015). Also independent T test results showed There was a significant increase in happiness in the training group compared to the control group (p=0.001).

According to the obtained results and the effect of physical exercises and exercises such as plyometric exercises on girls' happiness, it is suggested that plyometric exercises be used as a way to increase the happy and fun mood of people.

The effect of occlusion training at different time intervals on muscle growth factors in girls is a new topic. Therefore, the present study conducted to study effects of resistance training with and without vascular occlusion on serum levels of some anabolic and catabolic hormones in active girls.

For this purpose, 36 female students of physical education with an average body mass index of 23.32±2.79 kg/m2 were divided into three groups (n=12) including resistance training without vascular occlusion, resistance training with vascular occlusion, and control groups. Exercise groups performed resistance training for 30 minutes, three sessions per week, for six weeks and vascular occlusion was applied by closing the tourniquet around the proximal arm with a pressure of 100 mmHg. Fasting blood samples were collected before the start, 24 hours after, the 6th session, and the 18th session of the exercise protocol. Serum levels of insulin-like growth factor-1, growth hormone, cortisol, testosterone, and insulin were measured by Elisa method. To extract results, the analysis of variance with repeated measures and Bonferroni post hoc tests were applied at the significant level of p<0.05.

The results showed that after six weeks of intervention, the occlusion and non-occlusion resistance training reduced significantly both cortisol (p=0.01) and insulin (p=0.01) hormones; while testosterone (p=0.95) and insulin-like growth factor-1 (p=0.82) did not change significantly.

The results showed that low-intensity occlusion resistance training can induce alterations in the insulin and cortisol hormones similar to high-intensity non-occlusion resistnace intervention.

Female athletes are more likely to have knee ligament injuries than men due to less coactivation. The aim of this study was to determine the effect of 4 weeks of plyometric training on the coactivation level of the lower limb muscles of active girls in different phases of drop jump. 20 female physical education students (mean age: 21.8±0.63 years, height: 1.64± 0.05 m, weight: 56.98± 9.26 kg) were randomly divided into two groups: experimental plyometrics (n=10) and control (n=10). The experimental group performed plyometric training twice a week for four consecutive weeks. In pretest and posttest, surface electromyography was performed on tibialis anterior, medial gastrocnemius, biceps femoris and rectus femoris. The coactivation level of dominant thigh and shin muscles was calculated during 3 phases of drop jump from 20 cm height. Analysis of covariance was used to investigate the effect of training at the significance level of P≤0.05. The results of univariate analysis of covariance with controlling the pretest effect showed no significant differences between experimental and control groups in posttest coactivation of thigh and shin muscles in phase 2 (pre-activity, P=0.14 and P=0.07), phase 3 (contact, P=0.41 and P=0.11) and phase 4 (fly, P=0.65 and P=0.12). In the plyometric group, the coactivation level of thigh and shin muscles showed increasing and decreasing trends respectively. Backward plyometric movements increase the activity level of leg dorsal muscles and help the ACL stability.

The high incidence of ankle sprain, early resignation from sport and related disabilities have attracted the attention of researchers to identify and control those factors influencing the risk of this injury. The aim of this study wasto compare feed-forward activity of selected muscles of the ankle between collegiate active girls at the risk of ankle sprain and healthy girls.For this purpose, 32 active female students of physical education without a history of ankle sprain were divided into two groups (each group 16 subjects) including group at risk of ankle sprain (with less balance) and healthy group purposively and based on dynamic balance test scores (Y test). The feed-forward activity of muscles was evaluated by electromyography during jump-drop landing. The data were analyzed using multivariate analysis of variance (MANOVA) at P≤0.05. A lower feed-forward activity of peroneus longus and soleus muscles was observed in the group of at risk of ankle sprain (lower balance) when compared with the control group (P˂0.05). Probably, lower activity of these muscles in subjects with less balance could endanger the stability of the ankle and put them at risk of ankle sprain.