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Comparison the effects of two pedaling methods on lower limb muscles activity and fatigue index in road cyclists
Masomeh Abdi, Hamed Esmaeili, Dr Farzad Nazem, Dr Mehrdad Anbariyan,
Volume 13, Issue 9 (4-2015)
Abstract

The aim of this study was to compare the effects of two pedaling methods on lower limb muscles fatigue
index and muscular activity in road cyclists. For this purpose eight road cyclists participated in two separately
session in laboratory. They were pedaling with pushing technique in first session and circling (pullingpushing)
technique in the other session. Surface electromyography activity of the Rectus Femoris, Vastus
Medialis, Vastus Lateralis, Biceps Femoris, Semitendinosous, Gastrocnemius Medialis, Gastrocnemius
Lateralis and Tibialis Anterior muscles of the subjects were recorded. Each session was performed
according to predetermined protocol until exhaustion. There was a significant difference between pushing
and rest phases during two pedaling techniques with higher muscle activity in pushing technique. Subjects
during circling technique exhausted later. According to the results of this study, the circling technique caused
lower muscle activity consequently, increases gross efficiency. It is recommended that road cyclists utilize
the circling technique.


Develop of native aerobic power prediction equation by the 6-minute walk test in healthy child
Majid Jalili, Farzad Nazem, Akbar Sazvar,
Volume 16, Issue 16 (12-2018)
Abstract

Aerobic power (VO2max) is an important indicator of the health and physical fitness. Executive problems in direct VO2max measurement has led to developing sub-maximal aerobic power prediction equations. The purpose of present study was to develop native aerobic power prediction equation based on 6-Minute Walk Test (6MWT) and body composition indices in children. In 192 healthy children (8 to 12 years) VO2max was objectively measured by Bruce treadmill protocol with gas analysis. The 6MWT was performed according to ATS guidelines. Also, anthropometric measurements were measured according to standard methods. Multiple regression analysis was used to design aerobic power (ml/kg/min) prediction equation. Accuracy of native VO2max prediction equation was assessed by Pearson correlation and Bland-Altman approach between measured and predicted VO2max. Significant correlation was observed between direct VO2max and independent variables (r=0.25-0.734). Aerobic power of the boys could be predicted by weight and 6MWT according to the following equation: VO2max(ml/kg/min)= 5.359 + (0.067 × 6MWD m) – (0.286 × Weight kg) (r2=0.743, SEE=2.74 ml/kg/min, p≤0.001). Strong correlation was observed between measured and predicted VO2max (r=0.861, P≤0.001). In addition, Bland and Altman plots demonstrated a high degree of consistency between measured and predicted VO2max. Exercise and fitness coaches by utilization of native aerobic prediction equation based on the 6MWT and weight could be able to assess the aerobic power of the boys and to evaluation of the effects of exercise training on cardio-respiratory fitness.


The Effect of Six Weeks Upper Body Plyometric Training on Anaerobic Power and Record of 25 Meter Front Crawl Performance in 10 Years Old Swimmer Boys
Mr Mojtaba Sadeghi, Dr Hamid Rajabi, Dr Farzad Nazem,
Volume 21, Issue 25 (9-2023)
Abstract
The purpose of this study was determine the effect of upper body plyometric training on anaerobic power and record of 25 meters front crawl performance in 10 years old swimmer boys. 16 swimmer boys chosen voluntarily (The mean age was 9.9 ± 0.7 years ، weight 45.9 ±9 kg , Height 149.8 ± 5 cm، BMI  is 19.20 ± 3 Kg / m 2  ) And Subjects divided into two groups of training (n=8) and control(n=8).Before and after the implementation of the protocol investigate test 25 meters front crawl performance  at the distance 10, 20 and 25  metrs  and the number of hand strocke to check the performance of the swimming also anaerobic hand wingiting test function was evaluated. To analyze data, used the covariance test.The results showed six weeks upper body plyometric training Performance Indicators an hands Front crawl Including Peak power increased Significantly (18%) but the average power increase (7%) was not significant (p>0.05). Also, Swimming performance at of 10 meters) 8% (,10 to 20)6%( and 25 meters distance( 3/80%) growth in compare to control group that was significant(p <0.05) As well as in the number of hand strocke, Plyometric training group although had growth in swim 10 meters (11%), 10-20 meters (7.5%) and in 25 meters distance (5.33%) but the isnt significance (p>0.05). results indicate that six week upper body plyometric traning to an increase and improvement in the measured parameters, and can be used as a complementary training method in young swimmers.

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