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Volume 9, Issue 2 (10-2011)
Abstract
The purpose of this study was to collect the norm of bio-energetic
characteristics of male and female elite and advanced Badminton players in
Iran based on gender differences. This is a descriptive research of the kind of
normative survey. Statistical population of the research includes all elite and
advanced male and female Badminton players in Iran during 2010 including 128
elite and advanced players, 64 male (mean age 19.92 + 3.4 yr. height 176.53 +
6.13 cm, weight 70.46 + 6.77 kg and competitive experience 9.27 + 2.68 yr) and
64 females (mean age 17.00 + 2.4 yr, height 163.90 + 5.87 cm, weight 56.18 +
5.75 kg and competitive experience 6.27 + 1.55 yr). The statistical sample was
equal to the statistical population. Regarding the specific characteristics and
demands of Badminton, aerobic power, alactic anaerobic power and lactic
anaerobic power were measured. Also based on the distribution of the obtained
scores, frequency tables and percentage points of the players were drawn
based on gender differences in order to collect the related norms, using spss-15
software. Then according to the percentage norm and Likert scale, players'
performance was classified. One sample t test was applied to compare bioenergetic
characteristics of national and world elite Badminton players. The
results of this study indicated that the average aerobic power of Iranian male
and female elite and advanced badminton players, respectively 55/16 and 44/05
ml/kg.min are significantly lower than the values for world male and female elite
badminton players which are 63 and 50 ml/kg.min (p 0.01). also, the average
of sergeant vertical height of Iranian male and female elite and advanced
badminton players accounting for 63 and 48 centimeters are again significantly
lower than the reported values for world male and female elite badminton
players as 75 and 56 centimeters (p 0.01) but lactic anaerobic power of male
and female Iranian elite and advanced badminton players was in a goodsituation. The results of study highlight an urge to review and pay more
attention to designing professional practices in order to improve and develop
the aforementioned factors.
Mr Hamid Reza Barzegar Pour, Dr Fariborz Hovanloo, Dr Hamid Rajabi, Mr Naser Asgarzadeh,
Volume 14, Issue 11 (4-2016)
Abstract
The aim of the present research is comparing the effectof periodic trainingin hypoxic and normoxic conditions on anaerobic performance of athletes .Subjects of this research were 16 male volunteer students.Subjects were divided to two groups of eight by exercising in hypoxic condition(H 3300) normocytic.Anaerobic performance (peak power, average power) through the Wingate test and lactate concentration were measured before and after the Wingate test.After 24 hours in hypoxic condition,and after 48 hours in normoxic condition the measures of W max were determined.The intensity of exercises in both groups (one minute with intensity of 80% -85% Wmax, and two minutes with 50% Wmax) and exercise duration (30 minutes)were equalized. The training program consisted of 12 sessions in a row. After that the pre-test variables were measured again .After testing the normal distribution given by Kolmogorov – Smirnov test, dependent and independent t-Test with a confidence level of 0.05 ≥ p showed that this training improved aerobic performance in both groups, also five minutes after the Wingate test lactate concentration was decreased in both groups, but there was no difference between the 12 sessions of the periodic training in hypoxic and normoxic conditions on anaerobic performance. So it can be stated that the training used in this study can improve the anaerobic performance, but the severity and duration of hypoxia used in this study was not so much to improve anaerobic performance in hypoxic group more than normocyticone
Mr Amir Hossein Tavari, Dr Mohammad Hadi Honarvar, Dr Mostafa Hajlotfalian,
Volume 19, Issue 21 (9-2021)
Abstract
In recent years, efforts have been made to use non-invasive methods to achieve these angles. The aim of this study was to investigate the capabilities and reliability of a non-invasive system based on surface data mining using infrared depth cameras. To do this, you must first use a number of mathematical relations to create a cloud of points of the surface and to extract the desired deviations by geometric analysis of the map and surface topography. In this study, after extraction of cloud of points, the gossip method based on the second surface derivative was used to identify anatomical landmarks. Based on this, the body surface area was divided into a number of convexity, convection and parabolic. Then, by mathematical analysis of the surface topography map, the angles of a number of backward anomalies were estimated. To test the repeatability of this method, intra class correlation coefficient and minimum detectable changes were used to evaluate the relative and absolute reliability. The results of this study showed that it is possible to identify landmarks using the second derivative method with appropriate accuracy. The results of the reliability survey also showed acceptable and high values for the studied angles. Thus, it can be said that the use of this method has a good introverted reliability and can be a good alternative to radiography in continuous evaluations.
