Showing 5 results for Reliability
, , ,
Volume 10, Issue 4 (10-2012)
Abstract
Technology can provide safety in physical practices and improving the
performance of these activities, so manufacturing of equipments for these
purposes has been considered widely. The aim of the present paper was design
and fabrication of three-axis accelerometer. hree acceleration sensors, three
gyroscopes for angular velocity measurement, a microcontroller for converting
analog data to digital, a semiconductor memory for storing the sampled data, a
rechargeable battery and a spreadsheet in MATLAB environment have been
used. In order to examine the validity of fabricated instrument, the earth gravity
acceleration in three perpendicular axes have been measured and compared
with 9.8m/S2. In order to examine the reliability of the fabricated accelerometer
the ICC and test-re-test method have been used. The results showed that the
accelerometer has both reliability and validity. Due to its special features, it
enables us to sample in the offline mode and wireless manner. Such system
may be used for
Rasol Rezaei, , , ,
Volume 11, Issue 6 (10-2013)
Abstract
Abstract
The aim of this study was designing a specific upper body anaerobic power test for wrestlers and determining validity, reliability and objectivity of the designed test. In order to assess the anaerobic power of wrestlers on the basis of upper body Wingate test, Twenty two wrestlers (age=23/40±3/20 year, height=173/13±6/97 cm, weight=74/55±3/88 kg) of Tehran wrestling team (most of them were Asian champion) were participated in this study. Mean, maximum and minimum of anaerobic power and fatigue indices assessed by both tests. In order to analysis the correlation between power indices and physiological indices (blood lactate and heart rate), Pearson correlation has been used, and the differences between blood lactate after 2 min in both tests assessed. The result indicated that there was significant correlation between maximum (p=0/001 r=0/739), mean (p=0/001 r=0/670) and minimum (p=0/01 r=0/650) of power and fatigue indices (p=0/003 r=0/610) obtained by designed test and Wingate test. The result showed that there was significant correlation between heart rate immediately after doing both tests (p=0/001, r=0/705) and also the result show that there was not significant correlation between blood lactate after 2 min. of doing both tests (p=0/07 r=0/353). Statistical analyses also showed no difference between the blood lactate after 2 min of doing both tests. Analyzing the validity of designed test, revealed that there was significant correlation between max (p=0/000 r=0/840), mean (p=0/000 r=0/861) and minimum (p=0/000 r=0/830) power and fatigue indices (p=0/000 r=772) after performing twice of designed test. In analysis objectively of the designed test, the result revealed that there was significant correlation between max (p=0/000 r=0/832), mean (p=0/000 r=0/858) and minimum (p=0/000 r=0/805) power and fatigue indices (p=0/000 r=0/832) which was done by two different tester. It can be concluded that in respect to Wingate upper body test, the designed test in this study is valid and reliable test to measure the anaerobic power of wrestlers.
Dr Heidar Sadeghi, Mrs Shiva Noori,
Volume 13, Issue 10 (10-2015)
Abstract
Introduction and Purpose: Due to the importance of functional balance tests assessment with emphasis on
parameters influencing the balance including somatotype, this study undertaken to determine the reliability of
functional balance tests (static, semi-dynamic and dynamic) in endomorphe healthy women within 24-34 years
old. Methodology: 25 female endomorphe with the average and standard deviation age of 27.32±2.13 yrs,
height of 161.13±6.37 cm and weight of 58.28±8.46 kg, participated in this study. Functional balance tests
were assessed while Heath-Carter approach applied to determine the participant somatotype. All the functional
balance tests are used for each individual three times within 72 hours. Data distribution normalization are
evaluated by means of Kolmogorov-Smirnov test, while ICC was used for assessing the reliability at a
significance level of P<0.05. Results:The reliability of all static, semi-dynamic and dynamic balance tests used
in this study was confirmed with an endomorphe type body. Assessing static balance, the Stork and Angel
tests; semi-dynamic balance, Star Excursion Balance Test test; and dynamic balance, the Timed to Get Up
and Go and Tandem Walking tests got very good reliability level (ICC>0.80
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.
Dr Mohammad Yousefi, Mr Hamidreza Zanguie,
Volume 20, Issue 24 (3-2023)
Abstract
Genovarum and Genovalgum are the most common postural deformities of the knee joint. A quadriceps angle is used to measure these anomalies. Methods of measuring this angle are divided into two categories: invasive and non-invasive. The purpose of the present research was to study the inter/intra rater reliability of the non-invasive Body Landmarks Analyzer method for measuring of the quadriceps angle. Seventeen males (Age: 23.40 ± 1.7 years, height: 176.32 ± 6.41 cm, weight: 72.25 ± 14.6 kg, and BMI: 22.33 ± 1.38, kg/m2). participated in this study. Body landmarks analyzer system consists of a pen (sender) and camera (receiver), both of which are equipped with IR sensors. Anatomical Landmarks of the ASIS, medial and lateral epicondyle, tibial tuberosity, and medial and lateral malleolus were used to diagnose and calculate the quadriceps angle position. Intra-class correlation coefficient (ICC) two-way mixed model on absolute agreement was used to identify the inter/intra raters’ reliability. The results showed that the intra-rater reliability for the first technician was 0.83; The second technician is 0.81 and the third technician is 0.8. In addition, the inter-rater reliability was also 0.85. Therefore, it can be stated that the Body Landmark Analyzer method has good reliability for use in the extraction of knee joint abnormalities. Therefore, it can be suggested that this system be used along with other non-invasive methods.
