جستجوی مقالات مرتبط با کلیدواژه "شنای سرعتی" در نشریات گروه "تربیت بدنی"

The aim of this study was to investigate the relationship between anthropometric characteristics and crawl and breaststroke performance in adolescent girl swimmers with an emphasis on ratio of length and width of limbs to the height of subjects.
Twenty adolescent female swimmers voluntarily participated in this study. Anthropometric variables, including height , length of thigh, leg, foot, arm, forearm and hand , arm span, widths of pelvic, shoulders, knees, wrists and ankles were measured using a tape measure and caliper. Then the ratio of length and width of limbs to the height of subjects was calculated. Pearson correlation test at a significance level of 0.05 was used for statistical analysis.
Significant relationship were found between crawl record and subjects’ height, thigh, arm and forearm lengths, arm span, shoulder width, the ratios of arm, palm and foot length to the height and ratio of arm span to height (p In addition to the effect of anthropometric characteristics such as height, arm, forearm, thigh lengths, arm span, palm and shoulder girdle widths on the performance of adolescent girl swimmers, the ratios of limb lengths and widths to the height and ratio of shoulder girdle to pelvic width were positively related with swimming record. Thus, it is recommended that to achieve better results in swimming talent, coaches consider the ratio of limbs to the height.

Core stability is essential for proper load balance in the spine and pelvis. The so-called core is the group of trunk muscles that surround the spine and abdominal viscera. Core stability and its motor control have been shown to be imperative to initiate functional limb movements in athletes. The aim of this research was to study the relationship between core stability and time of speed swimming in female trained swimmers. 23 swimmers (mean age 10.91±1.59 yr, weight 40.26±9.21 kg and height 145.30±11.83 cm) who were undergoing training at least three years and were provincial members of swimming team were selected by purposive sampling method. Core stability was measured by McGill protocol that included right and left side bridges, trunk flexion and back extension tests. Swimming was assessed using the records of 50m and 100m front crawl, breaststroke and butterfly stroke and 50m backstroke. The data were analyzed by Pearson correlation test. The results showed a significant and negative relationship only between trunk flexion and record of 50m backstroke (r = -0.42, P=0.02). The results of the present study showed that as different factors influence athletic performance and swimmer's achievements, core stability may not be a proper variable for swimmers to achieve success.

The purpose of this study was to investigate the relationship between sprint performance of front-crawl swimming and muscle fascicle length in 23 male young swimmers. The sample was divided into two groups by 25-m sprint front-crawl swimming performance: 14.6-15.7 s (S1, n=11) and 15.8-17 s (S2, n=12). Muscle thickness and pennation angle and fascicle length of the Biceps Brachii (only muscle thickness) and Triceps Brachii and Vastus Lateralis and Gastrocnemius Medialis and Lateralis muscles were measured by B-mode ultrasonography. S1 had a significantly greater Vastus Lateralis, Gastrocnemius Lateralis, and Triceps Brachii muscle thickness. Pennation angle only in Triceps Brachii was significantly smaller in S1. S1 in Vastus Lateralis, Gastrocnemius Lateralis, and Triceps Brachii muscles had significantly absolute longer fascicle length and in Vastus Lateralis and Triceps Brachii muscles, had relatively (relative to limb length) longer fascicle length. There was a significant relationship between sprint performance of front-crawl and absolute and relative fascicle length in Vastus Lateralis (absolute: r = - 0.49, relative: r = -0.43) and Gastrocnemius Lateralis (absolute: r = -0.47, relative: r = -0.42). It is concluded that muscle fascicle length is one of the effective factors on the sprint front-crawl swimming in young swimmers.

(P=0.01). It seems that swimmers with more height and arm length have a better The aim of this study was to determine the relationship between anthropometric characteristics and performance of elite female swimmers in 50m freestyle swimming. 50 elite female swimmers who had participated in Iran Women’s Championships in 1388 (mean age = 15.92±1.12 years, height = 164.75±6.69 cm and weight= 51.50±4.10 kg) participated in this study as the sample. Anthropometric characteristics including height, weight, biacromial width, chest width, chest depth, chest circumference, waist circumference, buttocks circumference, arm circumference, thigh circumference, calf circumference, forearm circumference, biiliac width, thigh length, calf length, length of the foot sole, width of the foot sole, arm length, forearm length, hand length, hand width and hand grip strength were measured. Pearson product moment correlation was used to analyze the data (P≤0.05). The results showed a significant negative correlation between the subjects’ performance and height (P=0.005) and arm length performance. Swimming coaches can use these findings for talent identification in 50m freestyle swimming.

More swimming coaches agree that Increment of muscle strength and power is major factor of swim training and through these factors Success in swimming is predictable. According to studies and the difference between the record’s Asia and Iran elite swimmers, the aim of present study was to determine the effect of an eightweek of selected resistance training protocol on 25-50-75 and 100 meters swimming records in female physical education students. 18 people of 42 female physical education students of P.E. coaching (21±1.1 years old, 164.15±2.5 cm length and 56±8.6 kg weight) selected randomly and divided to Experimental (the swimming training program + selected resistance training) and Control (the swimming training program) groups. The selected resistance training (6session/week) included muscle adaptations, strength, and power with 85% intensity of 1RM. After 8 weeks (2session/week) of swimming training, Mean± standard deviation, K-S test (to examine the normality of the groups) and Dependent and independent t-test (to determine the differences between the two groups) were used for data analyzing (α= 0.05). The results indicated that the selected resistance training increased power in Scott in the leg, hand flexion), opposite stretch of hand, flexion and extension of femur motions significantly. No significant changes were seen in swimming performance between two groups [25 m (P=0/42), 50 m (P=0/30), 75 m (P=0/31) and 100 m (P=0/32) after 8-week of selected resistance training protocol but the results showed significant reduction in 25 m[E:(P=0/03) &C: (P=0/08)], 50 m [E: (P=0/003)], 75 m [E: (P=0/008) &C: (P=0/008)] and 100 m [E: (P=0/03) &C: (P=0/003)] and no significant decrease in 50 m (P=0/98) on control group swimming records after 8 weeks swimming training in both experimental and control groups. Generally based on the results of this study it can be concluded that the most effect of the strength training was the last 25 meters of 100m speed swimming than other quartiles.