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Showing 8 results for Speed

Aliakbar Fazel, Laleh Bagheri, Nader Rahnema, Samira Emadi,
Volume 0, Issue 0 (11-2019)
Abstract

Background: In rehabilitation medicine using targeted and personalized approaches are proposed, so that training protocols adjustments, based on gender, age, level of disability and the rate of progress can have more favorable results. The purpose of this study was to investigate the effect of personalized comprehensive rehabilitation training on some induces of physical function in women with MS presenting different levels of disability.
Material & Methods:  In this quasi-experimental study, 92 patients admitted to the MS Society of Shahrekord city were selected and on the basis of disability were categorized into 3 groups of mild, moderate and severe. Then each group was randomly divided into experimental and control group. The personalized comprehensive rehabilitation training program was done 12 weeks, 3 times per weeks. Muscles strength, endurance and speed of walking, were assessed. Independent and Covariance test were used for data analysis.
Results: The results showed that 12 weeks training cause improving in muscles strength, speed of walking in women with MS presenting different levels of disability (p<0.05). Endurance of walking improve significantly in mild group (p<0.05), but in moderate and severe group were not significantly (P˃0.05).
Conclusion: The implementation of the comprehensive rehabilitation exercises affected the recovery of patients with MS and made a significant difference in physical functions of patients.
 
Mr Ramin Rafiei, Dr Sadegh Amani-Shalamzari, Mr Ali Shahhosseini,
Volume 0, Issue 0 (11-2019)
Abstract

Aim: One of the methods used to improve sports performance is the use of carbohydrate mouth rinse. The purpose of this study is to investigate the effect of carbohydrate mouth rinse on the specific performance of trained soccer players.
Methods: Eighteen professional football players (22 ± 2 years) were randomized into two groups of carbohydrate mouth rinse (CMR) and placebo (P) in a fasted state after eight hours of sleep. During the two main test sessions, players were provided with either a color- and flavor-matched carbohydrate drink or a no-calorie drink (placebo) for a mouth rinse in a double-blind randomized crossover design. Players were asked to rinse the carbohydrate solution in their mouth for 10-15 seconds and then return it to the plastic cup. Sprint performance, maximum height jump, and 30-15 intermittent fitness test (30-15 IFT) were taken from the subjects.
Findings: Carbohydrate mouth rinse increased running distance in 15-30 IFT test. While there was no significant difference between the two groups in the performance of the 30-meter speed test and the maximum vertical jump.
Conclusion: Therefore, those soccer players who are unable to drink carbohydrate solutions due to digestive problems are advised to use the carbohydrate mouth rinse way to improve their performance during the game.

 
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Volume 11, Issue 5 (3-2013)
Abstract

The purpose of this investigation was to consider the Fast-Skin swimsuit's effect
on the elite female swimmers’ performance. So, twelve elite swimmers swam 50
and 200 m and 400 m trials with and without Fast-Skin at approximately 80-
100% of maximal effort in four swimming styles. In 400 m freestyle swimming,
traditional swimsuit compared with shoulder-to-ankle (SA) and shoulder-to-knee
(SK) of Fast-Skin (to control intensity, blood lactate and heart-rate was
measured). Also the propelling force of subjects was measured with indirect
way. Results showed, there was significant reduction in records of 50 m front
crawl, backstroke and butterfly, while no significant differences observed in
breaststroke. In 200 m for four swimming styles, reduction records were
significant. Also, different significant effect seen using traditional swimsuit in
comparison with SA and SK. Fast-Skin provide significant increased in
propelling force of front crawl, backstroke and butterfly, but no significant
propelling force observed in breaststroke. Using SA especially in fast front crawl
and semi-endurance butterfly and SK in endurance freestyle are recommended


Sasan Naderi, Dr Fariborz Mohammadi Pour, Dr Mohammad Reza Amir Seifo Dini,
Volume 13, Issue 9 (4-2015)
Abstract

The purpose of current study was to investigate the spatio-temporal gait parameters and knee varus angle
during walking at different speeds in young with knee varus. 18 subjects with varus deformity classified at
grade 3 of bowleg and 17 healthy subjects, volunteered to participate in this study. The following variables
include stance, swing, double support and cycle time, cadence, stride length, angle of varus at the heel
contact, midstance and toe off when walking on the treadmill at speeds of 80, 100 and 120 percent of
preferred walking speed, were measured from using the three-dimensional motion analysis system with six
optoelectronic cameras. The results of between-group tests showed that spatio-temporal gait parameters
in the varus group is similar to the normal group. Also varus angular variables in varus group, was indicate
higher values in comparison to the healthy group, but there were no significant differences. The results of
inter-group tests also showed the knee varus angle generally increases with increasing speed, that none of
the differences were not significant. According to the results, the increase in walking speed will caused to
increase knee varus angle. Therefore, walking with speed less than the normal walking speed, probably is
a suitable solution to reduce the loads exerted on the knee joint and prevention of premature osteoarthritis
in young with knee varus.


Mr Mojtaba Ashrostaghi, Dr Elham Shirzad,
Volume 13, Issue 10 (10-2015)
Abstract

Take-off is the critical phase of the long jump event. The aim of this study was to explore the relationships
between different variables and success in take-off. 37 trials performed by 8 long jumper, participants in
fourth indoor Asian senior athletics championships held in Tehran, with personal best average of 7.68±0.28
meter were recorded at 300 Hz. Five speed-related, five technical and four strength-related variables as well
as an anthropometric variable were measured using motion analysis software. More gain in vertical velocity
and less loss of horizontal velocity are considered as two criteria of take-off success and their relationships
with other variables were determined through correlation and regression analysis. Significant level of 0.05
was set. Some variables of all four groups were significantly correlated with success criteria. These variables
along with some others were entered in regression equations. The results emphasized on dominant role of
the technique and approach velocity and represented the effect of anthropometric characteristics on success
in takeoff. Furthermore eccentric strength of knee extensors was shown as the main strength factor in this
performance.


R Shiri, H Nikbakht, M Gholami, Kh Ebrahim,
Volume 18, Issue 19 (7-2020)
Abstract

Time under Tension of muscle is one of the variables of strength training that contributes to its adaptation. The present study was conducted the effects of six weeks of resistance training with the varying Time under Tension of muscle on VEGF and endosotene serum levels  in healthy young women. This study was conducted on 20 female students (22.65±2.03years) Subjects were randomly and equally assigned to two groups with a Time under Tension of 1s- 1s(Normal Speed Contraction) and 3s- 3s (slow Speed Contraction). The exercise load was the same in both groups and resistance training was done in a circular manner for six weeks, three days a week in eight stations. Blood samples were taken from the subjects to study  research variables before the training period and 48h after the last session of the training. Data were analyzed by covariance analysis at a significant level of P≤0.05. There was no significant difference between the serum levels of VEGF and endostein in both groups (P≥0.05). In the strength test, the  SSC group experienced increase power further. However, there was no difference between the two groups in indicators related to angiogenesis for six weeks and  most probably, for this indicator needed more training time, but  practice with more Time under Tension (3s- 3s) can lead to increase power further.
 

Faeze Nemati, Mostafa Zareei, Morteza Barzegar Bafrouei,
Volume 22, Issue 28 (12-2024)
Abstract

This study investigates the impact of an anterior cruciate ligament (ACL) injury prevention program on the performance of elite female kabaddi players. Given the debilitating consequences of ACL injuries, the primary aim is to evaluate the effects of an eight-week prevention program on improving the performance of these athletes. This quasi-experimental research was conducted on 27 elite female kabaddi players (aged 18 to 24 years), who were divided into intervention and control groups. The intervention group underwent an eight-week injury prevention training program. The tests included T-test, 20-meter run, Y-balance test, flexibility, hopping, and movement screening. Data analysis was performed using Levene's test and ANCOVA. The results of the ANCOVA indicated that the intervention group scored significantly better than the control group in the Y-balance test for both the right (p=0.002) and left (p=0.001) legs, single-leg hopping (right leg: p=0.004 and left leg: p=0.001), crossover hopping for the right leg (p=0.023), and the sit-and-reach flexibility test (p=0.003). However, no significant differences were observed in the speed, agility, triple hopping, and functional movement screening (FMS) tests. Results: The findings suggest that the eight-week PEP program has a significant impact on dynamic balance for both the right and left legs, hopping (single-leg and crossover hopping for the right leg), and hamstring and lower back flexibility in elite female kabaddi players. However, it did not have a significant effect on left leg hopping, speed, agility, or FMS scores.

Leila Ghazaleh, Farahnaz Salar, Fatemeh Sharifi,
Volume 22, Issue 28 (12-2024)
Abstract

This study aimed to compare the effect of fatigue induced by endurance running and sprinting on the knee muscle co-contraction in active young women. Methodology: Thirteen active young women (20-30 years, BMI 20-25kg/m2) were randomly selected. Subjects performed fatigue protocols during two sessions with a four-day interval. The activity of the vastus-medialis and vastus-lateralis muscles was detected using an electromyography device before and after running 400-meter and 3000-meter during the execution of knee extension and their co-contraction was calculated. Two-way repeated measure was used to analyze the data. Results: There was no significant difference between the co-contraction of the selected muscles before and after sprinting (p=0.3) and endurance running (p=0.19) and no significant difference (p=0.85) between the difference in co-contraction rate in the pre-test and post-test of sprinting and endurance running. Conclusion: Since there was no difference between the effect of fatigue caused by sprinting and endurance running on the co-contraction of the selected muscles, likely, the involvement of central factors in the appearance of fatigue caused by 400-meter sprinting and 3000-meter endurance running is similar and insignificant. The emergence of fatigue after implementing both protocols may be more due to environmental factors.


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