Majid Jalili, Farzad Nazem,
Volume 5, Issue 2 (9-2017)
Abstract
Introduction: Application and correct interpretation of the 6-minute walk test (6MWT) in medical, therapeutic, and exercise settings requires normal values of the 6MWT. The aim of this study was to develop and cross-validate the 6MWT prediction equation in Iranian healthy children and adolescent males.
Methods: The 6MWT and anthropometric variables were measured in 391 males (8 to 17 years old) with standard methods. Pearson correlation was used to assess the relationship between distances walked in the 6MWT and independent variables. Multiple regression analysis was used to design 6MWT prediction equation from dependent variables. Furthermore, accuracy of the present 6MWT prediction equation was cross-validated.
Results: Significant correlation was found between distances walked in the 6MWT and anthropometric characteristics (P < 0.001). Multiple stepwise regression reviled that age and Body Mass Index (BMI) could explain 63% of the variability of 6MWT in children and adolescent males (r2= 0.627, SEE= 36 m, P < 0.001). Accuracy of native 6MWT prediction equation was approved by good correlation between measured and predicted distance walked in the 6MWT (r2 = 0.79, P < 0.001).
Conclusions: This is the first study on the development of native 6MWD reference values. With application of this 6MWD prediction equation, physicians, physical therapists, and fitness coaches could receive correct feedback of pharmacological, rehabilitation, and exercise interventions.
Farzad Nazem, Abbas Rezaei, Majid Jalili, Hossein Saki,
Volume 8, Issue 2 (6-2020)
Abstract
Background and Aim: Accurate and rapid measurement of cardiorespiratory system performance by estimation methods regardless of basic physiological fitness level, geographical environment, culture and nutrition is of paramount importance. The purpose of this study was to design linear regression equations to estimate the aerobic capacity of healthy adolescent boys without the use of sport tests and validation of this equations.
Methods: In the present semi-experimental study, 156 healthy adolescent boys aged 13 to 17 years with a mean body mass index of 21.43 ± 4.5 Kg / m2 were selected by purposive sampling method. To design the non-sport equation for estimating maximum oxygen consumption (VO2peak), a multiple regression linear model and Pearson correlation were used to validate the equations.
Results: Significant correlations were observed between the measured VO2peak and the anthropometric and physiological variables (R=0.122 - 0.799, P<0.001). Also, a valid non-exercise linear equation for boys' VO2peak prediction was designed with variables such as age, BMI and resting heart rate (SEE = 3.59 mL/kg/min, R2 = 0.712, P<0.001). The estimated VO2peak from equations had a significant correlation with the obtained criterion value. (R = 0.707 – 0.730, P<0.01).
Conclusion: According to the results of the present study, it is possible to use aerobic capacity estimation equations, is a simple, accurate, safe tool in assessing the baseline cardiorespiratory fitness (VO2peak). The use of non-Exercise equations in the planning of exercise in large populations of adolescent boys and even as a daily clinical practice in the elderly and heart patients with the goals of promoting health, cardiovascular health, preventive actions is very important.
Payam Khanlari, Leila Soliemani, Armita Pak, Elahe Amouzadeh, Seyed Abolfazl Zakerian,
Volume 14, Issue 2 (6-2026)
Abstract
Background and Objectives: Occupational anxiety is a critical psychological issue in the workplace, negatively impacting employee mental health, job satisfaction, and productivity. This study aimed to evaluate the psychometric properties of the Persian version of the Occupational Anxiety Inventory among Iranian workers.
Methods: A cross-sectional validation study was conducted. The questionnaire was translated into Persian using the forward-backward procedure. Data were collected via online surveys using convenience sampling. Internal consistency was assessed using Cronbach’s alpha and Composite Reliability (CR). Construct validity was examined through exploratory and confirmatory factor analyses (EFA and CFA), and convergent validity was evaluated using the Average Variance Extracted (AVE). Criterion validity was assessed by examining correlations between occupational anxiety and general anxiety, work-related outcomes, and demographic variables.
Results: The Persian version of the Occupational Anxiety showed excellent internal consistency, with a Cronbach’s alpha of 0.95. The Kaiser-Meyer-Olkin index was 0.941, and Bartlett’s test was significant, supporting factor analysis. Exploratory factor analysis indicated acceptable factor loadings, and confirmatory factor analysis showed standardized loadings ranging from 0.688 to 0.878. The AVE was 0.66 and CR was 0.951, indicating good convergent validity and reliability. Occupational anxiety was positively correlated with general anxiety (r=0.693) , impaired functioning due to anxiety, sick leave, intention to quit, and history of anxiety and depression. Negative correlations were found with job satisfaction, pay satisfaction, benefits satisfaction, promotion satisfaction, job security, supervisor support, and coworker support.
Conclusion: The Persian version of the Occupational Anxiety Inventory has very favorable psychometric properties. This instrument has the necessary validity and reliability to measure occupational anxiety in the Iranian employee population and is recommended to researchers and occupational health professionals for screening, identifying anxiety dimensions, and developing preventive interventions.
