Search published articles


Showing 5 results for Strength Training
omparison of effects of two type resistance exercises on vertical force and impulse caused by diagonal blows on the spike skill of female volleyball players
Dr Mohsen Barghamadi, Miss Roghayeh Parsa, Dr Amir Fatollahi,
Volume 0, Issue 0 (11-2019)
Abstract
Volleyball players are looking to apply their force at a short  time speed  to  transfer more  diagonal  and vertical blows  on the ball  so  that  you land  on the  opposing  team's field more quickly and make it  difficult for the  opposing  team players to  receive. It seems that various types of resistance training can improwe the vertical force of the spike skill.
Therefore the aim of the current study is to compare the effects of two types of resistance training (exercises with cable machines and exercise with barbells and free weights) on vertical force and impulse caused by diagonal hit on spike skill in college girl volleyball players. The present study method was semi-experimental. The statistical samples in this study included 45 girl volleyball players from university of Mohaghegh Ardabili. In three groups of 15 in groups 1 and 2 strength training intervention for two days a week, in 7 strenght movements with a cable bodybulding machine and barbell, dumbbell, and medicine training tools, observing the principle of overload in three movement intensities: 80%, 5 repetition, 90%, 2 repetition, 100%, one maximum repetition and in the third group in the form of a control group were identified. Strength training as an independent variable and vertical force and impulse as a dependent variable. Bertek force plate was used to record ground reaction forces. The table was used to adjust height, the invisible thread and the ball for the dominant hand shot in the volleyball players. In this study, ANOVA test was used with a significance level of 0.05. The effects of the force resulting from the diagonal impact on the ball in line with the vertical force of the ground reaction were significant in intervention group 1 (p< 0.008) and intervention group 2 was not significant (p< 0.133).The effect of the impulse time factor in the strength training group was significant in the vertical component of the ground reaction in intervention group1 (P<0.030) and in intervention group 2 (P<0.023). The difference between the groups in the intervention group shows the effect of the vertical force factor in the intervention group 1 with the impact factor (v = 0.016) compared to the group 2 also, in the impulse factor, impact factor was effective in intervention group1 (v = 0.190) and strength training in intervention group 2 (v = 0.167).  It seems that barbell and medicine ball strength exercises increased force in diagonal strikes and produce the maximum vertical force in the shorter time to the ball in the spike skill of the diagonal strike of the volleyball players.

Effect of aerobic and strength training on serum PTH, calcium, albumin and alkaline phosphatase in postmenopausal women
, , , ,
Volume 10, Issue 3 (6-2012)
Abstract

The purpose of this study was to consider the effect of eight weeks aerobic
and strength training on serum PTH, calcium, albumin and alkaline
phosphatase in postmenopausal women.35 post menopause women, (55-70
years), of Jahandidegan center of Tehran were selected and randomly divided
to three groups as aerobic (n=12), strength (n=13) and control (n=10) groups.
Aerobic training program include jogging and aerobic movements, with 60-
70% MHR intensity(8 weeks, 3 times per week, 40minute per session), And
Strength training program with emphasize on main muscle groups (8 weeks, 3
times per week, 1 hour per session),with30-40%1RM,8-10rep,1set to 60-
80%1RM,8-10rep,1set . One way analysis of variance (ANOVA) used to
compare differences between groups. The results showed that PTH and
alkaline phosphatase significantly increase after aerobic and strength training
in comparison with control group (P≤0.05). But the significant difference was
not observed between these two groups. No significant difference was
observed in serum calcium between two trained and control groups (p≥0.05).
However a significant decrease was observed in strength group (P≤0.05).
Furthermore, the significant change was not observed in albomin after training
program. Increase in PTH and alkaline phosphatase concentrations in normal
range seem to promote anabolism procedure of bone formation. The result of
this study shows that both two type of training have same effects on bone
markers and hormonal factors.


The Comparative Study of Effects of 4 Weeks Accommodation and Constant Load Strength Training Methods on Maximum Strength and Power of Trained Athletes
Jalil Ataei, Dr Mohammad Reza Dehkhoda, Dr Hamid Rajabi, Dr Naeima Khajavi, Sara Zarea Karizak,
Volume 12, Issue 8 (10-2014)
Abstract

The purpose of this study was to compare effect of 4 weeks of strength training in two ways of accommodation and constant resistant methods on maximum strength and power of trained athletes. Sixteen Wushu athletes and wrestlers chosen from Tehran’s clubs with a mean age of 20.50 ±2.00years, height 174.34 ± 6.53cm, weight 70.22 ± 10.50 Kg, and body fat percent, 12.87 ±. 4. 23 participated in this study. After the initial testing of the variables of maximum strength (1RM), upper body power (medicine ball to throw, cm) lower body power (vertical jump, watt) Body fat percent (Skin Fold three point), limb circumference (cm) and Weight (kg), divided in two equal groups. Each group has done resistance strength training program for 4 weeks, three sessions per week, with 85% of their 1RM, with three sets and 5 repetitions with Squat and bench press exercises. But in case of accommodation group, 20% of their 1RM was used by chain through the full range of motion. At the end of the training, re-test of dependent variables were performed under similar conditions. Covariance analysis was used to compare the progressof power and strength between the two groups. This study showed that weight (p=0.391), limb circumferences (P=143), fat (P=0.413), the upper body power (P=0.267), lower body power (P=0.252) and the maximum upper body strength (P=0. 803) there was no significant difference between groups, but in case of maximum strength of lower body (P=0.04) there was significant difference between the two groups. In analyzing the results, although most variables did not show significant difference, but the effects sizeanalyzing of groups showed that in upper body power (ES=0.62), lower body power (ES= 0.64),upper body strength (ES=0.13)and lower body strength (ES=1.84), the results were in favor of accommodation group. This difference in the maximal strength in accommodation group were (62.15% in the upper body, 68.38% lower body) and in constant strength group (86.14% in the upper body, 84.21% in the lower body) respectively. Also the effect size of power for accommodation group were (97.6% upper body, 61.6% lower body) and in constant group (16.4% upper body, 67.4% lower body), respectively. This study showed that in order to increase maximal strength and power, accommodation training method is more effective than traditional constant training.


Comparison of combined strength and feedback trainings on kinetic and functional factors in athletes with plyometric pattern
P Zalbeik, A Letafatkar, Sh Rezvan Nobahar,
Volume 18, Issue 19 (7-2020)
Abstract
Feedback instruction is a proven modality for the alteration of motion patterns. There are no existing data on the contribution of strength training, when combined with feedback instruction, to the altering of lower extremity biomechanics. Thus the purpose of the current study was comparison of strength training  program with external and internal focus of attention strategies on kinetic and functional factors in athletes with plyometric pattern. 36 athlete females (handball, Basketball and vollyball) voluntarily with avarage age 22.3±2.27 years were randomly assigned to strength training with external focus, strength training with internal focus and strength training groups. Participants completed these training for 8 weeks. Kinetic factors were measured using force plate during landing, as well as functional movement and movement pattern respectively were measured by single leg triple hop test (SLTH) and landing error scoring system. One-way analysis of variance (ANOVA) showed that the effect of strength training with external focus group training significantly was better than two others groups in Peak vertical ground reaction  (p=0.039), posterior ground reaction force (p=0.046), mediolateral time to stability (p=0.032), single leg triple hop test (p=0.041) and landing error scoring system  scores (p=0.030). But there was no significant between-group difference in anteroposterior time to stability (p=0.312). Subjects in strength training with external focus group showed significantly within-group changes in all variables except anteroposterior time to stability from posttest to pretest. Programs that include both strength training and movement education through external focus of attention may be necessary in order to prevent ACL injuries and increase athletic performance.

 

Page 1 from 1     

© 2024 CC BY-NC 4.0 | Research in Sport Medicine and Technology

Designed & Developed by: Yektaweb