Research in Sport Medicine and Technology

The purpose of this study was to examine the difference between two types of
the soccer instep kick in temporal sequence of motion and muscle
electromyography, during forward swing phase of the kick. Ten elite soccer
players, volunteered as subjects in the study. To culculate the kinematics data,
we used DLT method with two video camera that filmed five markers fixed on
anatomical points of lower body, at 240 fpm. Moreover the electromyography of
rectus femoris, vastus medialis and tibialis anterior were estimated. Kinematic
data from ten players was extracted using image processing toolbox of
MATLAB software. Using these results, we compared sequences of joint motion
and progression of activation muscle in low drive and high drive kick. The
results indicate that there was a difference in ranks of muscle activation
between two kick, but there were no difference in muscles activation time and
sequence of joint motion between low drive and high drive kick. Furthermore
both kicks have a similar proximal-distal pattern and interaction in muscles
contraction and joints motion

The purpose of this study was to survey effects of twelve weeks endurance training on serum levels of selected hormones in underweight men. Eighteen healthy underweight men were randomly divided at two groups: endurance training and control. Serum levels of adiponectin, testosterone, and cortisol were assessed before and after training. Endurance training protocol consisted of twelve weeks pedaling on cycle ergometer (3 sessions per week, intensity 60-70% of reserved heart rate, duration of each session 20-40 min). Data were analyzed by SPSS16 software and using Independent and Paired t-tests. Statistical significance was accepted at P<0.05. Endurance training has no significant effect on serum concentrations of adiponectin (14.4±2.4 vs. 13.9±1.8 &mu;g/ml) and cortisol (178.2±48.7 vs. 167.3±39.6 ng/ml) (p>0.05), while decreased serum testosterone concentration (8.2±1.6 vs. 7.2±1.8 ng/ml) (p=0.032) and increased VO2max index (p=0.008). Performing endurance training twelve weeks has no effect on serum adiponectin concentration in underweight men, likely due to lack of change in body fat percent. It doesn’t appear that decrease of circulating levels of testosterone following this period training has detrimental effects on anabolic-androgenic testosterone-dependent processes, and even according to previous studies, it can be useful for cardiovascular health. Anyway, cardio respiratory fitness level of underweight men improved following the endurance training. It doesn’t appear that endurance training has effect on resting (non-exercise condition) levels of cortisol concentration in underweight men.

Introduction: 24-67% of recreational runners suffer from running-related injuries. The purpose of this study was to test the effect of unstable shoes on selected ground reaction force (GRF) parameters during stance phase of running.
Method: 20 healthy men (age of 21±2.27 years, height of 176.93±5.39 cm, and mass of 72.30±8.84 kg) ran on the force plate placed in the middle of 15 m runway in barefoot, with unstable and control shoe conditions. Peak vertical GRF, posterior force, loading rate and impulsive passive force variables were calculated in the three conditions. A repeated measure of ANOVA and Duncan post-hoc tests applied to test the hypothesis (p<0.05).
Results: vertical loading rate and vertical peak passive force variables were significantly increased in unstable shoe condition compared to control shoes. In addition, peak posterior force and impulsive passive force variables were significantly increased in unstable shoe compared to control shoe.
Conclusion: unstable shoe could increase ground reaction force parameters on foot during running. This finding suggests that unstable shoes could possibly increase risk of running related to injuries.

The aim of the present study was to investigate the effect of glucose and glutamine supplementation on serum HSP72, in non-athlete men during four weeks exhaustive endurance - intermittent training that causes glycogen depletion. For this purpose 20 non-athlete healthy men were selected and randomly divided into four groups including: glucose supplementation with glycogen depletion training group (n = 5, supplement 1), glutamine supplementation with glycogen depletion training group (n = 5, supplement 2), glycogen depletion training group (n = 5, placebo) and a group without any treatment (n = 5, control). The blood samples were collected at the onset of training protocol period and 48 hours after final training session from anticubital venous. Serum HSP72 concentration were determined by ELISA technique. The main and interaction effects of variables were determined using TWO WAY ANOVA compeleted with Tukey post-hoc test. The significant level was chosen as &alpha; = 0.05.The results showed the significant effect of training variable for serum HSP72 concentration, [F(1,17)= 6.362 P<0.05] . The effect of supplementation variable was significant for serum HSP72 concentration, [F(1,17)= 15.362 P<0.01] . Post-hoc test showed the significant difference between placebo with supplement 1 group (p<0.05) and placebo with supplement 2 group (p<0.01). The interaction effect between two variables was not significant. In summery, the results suggested that in glycogen depletion training condition, glucose or glutamine supplementation have significant effect on serum HSP72 concentration.

The purpose of this study was to determine the effect of combination specific resistance and ordinary swimming  training on Breaststroke swimming  performance in young boys. Twenty boys of Alborz  province  swimming team age of 13±1 years ,weight 50/ 65±1/02kg and height 159/8 ±4/91cm, participated in this study. After the initial testing of the performance variable (Fifty-meter record of Breaststroke swimming) , technical variable (stroke number) and  strength variable (strength of spinal extensor muscles), subjects were randomly divided in two groups, Experimental group (combination  specific  resistance and ordinary swimming  training) and control group(ordinary swimming  training).A week of familiarization training was performed to adapt with vest (specific resistance) and then training program were performed  for 6 weeks, three sessions per week .Training program consisted of 15minutes of warmup and 8 repeats of 50 meters breaststroke  with 1minute rest interval between repetitions, in exprimental group (with vest of training) and control group(without vest of training). At the end of the training, post test  was performed  in accordance with the conditions of the pre test.  Kolmogorov –Smirnov  test was used to determine normality of data distribution, Paired t-tests was used to determine within group changes and the covariance analysis was used to compare the progress of dependent variables between the two groups. The results of this study indicated that although swimming performance was significantly improved in both groups (p≤0.05) ,but there were no  significant differences between the groups in fifty-meter record of Breaststroke swimming,­ stroke number and strength of spinal extensor muscles (p≥0.05).It may be attributed to non-professional subjects or Low-intensity resistance training.

Introduction: Taekwondo is one of the most popular martial arts in the world and Iran. Taekwondo is a contact
sport which contains a high rate of injuries. Thus, the more travelling through the time, the more protective
equipments is provided to prevent injuries. The present study purposed to compare the sport injuries of premier
leagues in 2 season and study the effectiveness of protective equipments such as protective gums, particular gloves
and socks, and electronic Hugo in the Iranian taekwondo athletes.
Method: For this prospective study, 197 athletes(with the mean age and body mass of 23.2 year-old and 70.52
kg, respectively) were studied for injuries incurred in 2011-2012 league. Afterward, the collected results were
compared with the results of the same league in 2006-2007, descriptively.
Results: As shown, the injury rate was declined from 69.5 injury per 1000 AE in 2006-2007 league to 19.09 injury
per 1000 AE in 2011-2012 league. All injury types were decreased except epistaxis. Likewise, number of injuries in
upper extremity, lower extremity, head and neck and trunk were decreased.
Discussion: The injury reduction may be due to the application of protective equipments like electronic Hugo which
was a main factor in reducing strikes’ power, and the usage of particular socks and gloves for more coverage and
protection. Additionally protective gums could protect tooth and mandible from injury. Of course the effect of getting
more professional and performing scientific conditioning trainings should not be ignored.

The purpose of this study was to determine the relationship between changes of some of the
cardiorespiratory factors during submaximal activity with slow component of Vo2 after static and dynamic
stretching in 16 active women from physical education college ( Mean ± SD : age, 23.87± 1.62 yr ; weight,
57.20 ± 7.84 kg ; height, 163.46 ± 6.23 cm; body fat % ,23.96 ± 2.70 and Vo2max, 42.15 ± 3.41 ml.kg-1.min-
1). After measurement of Vo2max and LT , the subjects performed two protocols of stretching (static and
dynamic) and one protocol without stretching before submaximal activity (treadmill running at 70% Vo2max)
in three separate sessions. Respiratory gas exchange and HR was measured by gas analyzer and polar
and time constants (&tau;1- &tau;2 - &tau;3) were calculated from O2 kinetics graph. Results revealed a positive correlation
between slow component of Vo2 with changes of VE (0.76), Fb (0.48), Tv (0.67), HR (0.41), &tau;1 (0.49) ,&tau; 2
(0.52) , &tau; 3 (0.46) and steady state oxygen uptake increased significantly after static stretching (P=0.031).
Therefore, results of this study showed that some of changes in slow component of Vo2 after static and
dynamic stretching related to metabolic and cardiorespiratory factors.

Introduction: This research aimed to analyze the effect of 12 weeks aerobic exercise training on some
characteristics of immune system and general health of women with breast cancer. Methods: 40 female
with breast cancer, undertaking chemotherapy, were classified in exercise group with mean age of 36/9±13/2
years, weight of 67/2±9/95 kilograms and body mass index of 21/9±2/9 kg/m2 and control group with mean
age of 38/6±10/1 years, weight of 65/1±8/28 kilograms and body mass index of 21/4±2/1kg/m2. Exercise
group Perfored in 12 contionous weeks walking with moderate intensity (based on Modified-Borg scale and
40-60% Maximum Heart rate)/3 times a week/30-45 minutes in each session. General Health Questionnaire
(GHQ) was used for evaluating general health level. Before and after 4, 8 and 12 weeks CBC DIFF test was
conducted for aim of assessing some characteristics of immune system. CANCOVA was used to determine
the pure effect of exercise intervention. The data were analyzed with significant level of p≤0/05 and by SPSS
16. Results: General health and hope of life was decreased significantly after intervention in control group
(p≤0.05). Number of leukocytes of exercise group was higher after the exercise intervention, but this
difference was not significant, but number of leukocytes of control group was decreased significantly
(p≥0.05). Conclusion: Regular aerobic exercise with moderate intensity is an effective way in maintenance
the number of leukocytes, improving immune system and enhancing levels of general health.

Aims: This study investigated the effects of creatine and L-carnitine supplementation on anaerobic
performance and body weight changes in athletes. Methods: In this single-blind randomized clinical trial, 45
athletes were selected and randomly divided into four groups supplemented with: a) Creatine, b) L-carnitine,
c) Creatine- L- carnitine and D) placebo. The supplementation period was 28 days. Wingate anaerobic test
was done for assessing athletes' anaerobic performance and their weights were measured before and after
the supplementation period. To compare the variables before and after each test, paired t-test and anova
are used compare within and between variables respecdivey. Results: The anaerobic performance indices
in the groups receiving creatine and creatine- L-carnitine were significantly increased after intervention. Body
weights were also significantly increased in the supplemented groups. Conclusions: Based on the dosage
and duration of supplementation in this study, concurrent creatine and L-carnitine supplementation has
positive effects on anaerobic performance. Despite L-carnitine is a weight loss agent, the findings of this
study showed weight gain in the supplemented groups.

The main purpose of the present study was to investigate the kinematics and kinetics of successful versus
unsuccessful basketball free throw shots. Six professional basketball players (age= 23±2.09 years members
of Iranian premier basketball league participat in test. Kinematics of arm motion during basketball free throws
were recorded by two Casio zr200 camera in frequency of 240 Hz. Wilcoxon test was used for significant
differences between successful versus unsuccessful free throws (p ≤ 0/05). Angular velocity of the wrist was
found to be significantly higher in successful versus unsuccessful shots at the time of ball release (p ≤ 0/028).
Wrist (p ≤ 0/008) and shoulder (p ≤ 0/023) joints were found to have significantly more flexion in successful
versus unsuccessful shots while elbow (p ≤ 0/002) remained significantly less flexed in successful shots.
Angular displacement of wrist (p ≤ 0/034) and elbow (p ≤ 0/004) was shown to be significantly greater in
successful versus unsuccessful shots. Integrated EMG of Anterior Deltoid (AD), Triceps Brachii (TB) and
Flexor Carpi Radialis (FCR) muscles was more in successful free throw versus unsuccessful free throw, but
the only significant difference was observed in the Integrated EMG of the Triceps Brachii muscle (p ≤ 0/034).
In summery, increasing the wrist angular velocity and activity of triceps brachii muscle affected successful
free throws.

The purpose of this study was to investigate the effect of eight weeks comprehensive corrective exercises
on upper Crossed syndrome. 40 female college students with forward head, forward shoulder, and kyphosis
voluntarily participated in this study and randomly divided to two experimental group (with mean age
21.60±1.70 years, height 159.78±5.11 cm, and weight 59.04±4.6 kg) and control group (with mean age
21.85±1.87 years, height 160.15±4.32 cm, and weight 58.42±5.76 kg). The experimental groups performed
comprehensive corrective exercises included eight weeks and three times per week. The angles of forward
head and forward shoulder were assessed using photographic taken from lateral view and Kyphosis angle
was assessed using flexible ruler (r=0.93) before and after eight weeks corrective exercises program. The
data was analyzed by SPSS (p≤0.05). On the base of findings, we suggest that experts in order to obtain
better results in their training programs, pay attention to correct abnormalities simultaneously, as a new
approach.

Validation of predicting fatness methods in the Iranian girls with respect to the maturity process could help
to identify anthropometric risk factors. This study evaluate the accuracy of four body composition prediction
equations in the teenager students in Hamadan city .Method: The anthropometry profile of 266 adolescent
girls (12-16 ys) including ,weight (55.69±10.18 kg),body mass index (21.93±3.6 kg/m2) and percent body fat
averages (29.65±4.41%) were measured using the bioelectrical impedance analysis (BIA) as a reference
style and the selected skinfold prediction equations, ie, Durnin-Rahaman, Deurenberg , Westrate-
Deurenberg, Slaugter. Results: Significant relationship was observed between BIA and four body
composition prediction equations (p<0/05) with intervene the maturity level. However the most relationship
was found among BIA method and Durnin-Rahaman logarithmic equation (R=0.82-0.92 ,p<001).
Conclusion: It seems that physical education coaches and health-related organizations for athletic
performance and Clinical assessments of body composition in young individuals probably can accurately
utilized fat prediction, especially by applying the Diurnin- Rahaman skinfold equation.

As one of the most famous martial arts karate kata and kumite are two main ]1[. Different techniques when doing sports, including quadriceps muscles and joints (knee extensor muscles) and joint use. In this study, called the internal and external obliques broad kata and kumite athletes dominant leg when the two techniques were compared Znkutsudachi and Movashi Gray. Therefore, local and wide flat external obliques muscle activity during the two techniques in the dominant leg Karate Twenty healthy female elite athletes, (mean age 21/8) were recorded. After the onset of muscle activity was determined and the results of data processing using statistical techniques to design a mixed ANOVA between groups and within groups were examined. The results showed that flattened the internal oblique muscle Znkutsudachi techniques in kumite athletes Katakaran to be done first.

Background: This study aimed to examine the effects of endurance swimming training during pregnancy on pregnant rat’s neonate liver tissue apoptotic index. Methods: 16 pregnant rats (200 ± 20 g) were divided into two swimming and control groups. The rats of training group were forced from first day of pregnancy to delivery in a particular pool. The sampling of the neonate liver tissue was performed two days after born and the liver apoptotic percent index was determined with TUNEL technique. Statistical analysis of the data was done using independent t-test (ɑ ≤0.05). Results: The results showed that the average neonate liver apoptotic index in the control and training group respectively was 6.40% and 6.20% that indicate no significant difference between two groups (p<0.05). In addition, exercise produced no significant changes in birth weight (p <0.05). Conclusion: These results suggest that swimming endurance training during pregnancy maybe have no negative and worrying impact on neonate growth and liver apoptotic index.

Purpose: The aim of this study was to test the effect of 50 gr changes in sport shoes' weight on Vo2max and running economy during 15 minutes running protocol. Method: 15 active males (age of 24.60 ± 2.06; height of 178 ± 5.83 cm) were selected in this study. Subjects ittrcicitrap in a 15 minutes running protocol in three running speeds of 4, 6 and 8 km/h. Total time for each running speed was 5 minutes. Vo2max was measured using Metamax gas analyzer and running economy was determined by calculating the slope of vo2max changes during 15 minutes running. One way repeated measure ANOVA was used to test hypotheses (p<0.05). Results: Vo2 max increased significantly during 15 minutes running, however, no significant changes was observed in slope of Vo2 max when we increased 50 gr shoes' weight. Conclusion: 50 gr increases in sport shoes' weight could increase mean Vo2max but may not affect running economy in a 15 minutes running protocol.

The purpose of this study was to compare effect of 4 weeks of strength training in two ways of accommodation and constant resistant methods on maximum strength and power of trained athletes. Sixteen Wushu athletes and wrestlers chosen from Tehran’s clubs with a mean age of 20.50 ±2.00years, height 174.34 ± 6.53cm, weight 70.22 ± 10.50 Kg, and body fat percent, 12.87 ±. 4. 23 participated in this study. After the initial testing of the variables of maximum strength (1RM), upper body power (medicine ball to throw, cm) lower body power (vertical jump, watt) Body fat percent (Skin Fold three point), limb circumference (cm) and Weight (kg), divided in two equal groups. Each group has done resistance strength training program for 4 weeks, three sessions per week, with 85% of their 1RM, with three sets and 5 repetitions with Squat and bench press exercises. But in case of accommodation group, 20% of their 1RM was used by chain through the full range of motion. At the end of the training, re-test of dependent variables were performed under similar conditions. Covariance analysis was used to compare the progressof power and strength between the two groups. This study showed that weight (p=0.391), limb circumferences (P=143), fat (P=0.413), the upper body power (P=0.267), lower body power (P=0.252) and the maximum upper body strength (P=0. 803) there was no significant difference between groups, but in case of maximum strength of lower body (P=0.04) there was significant difference between the two groups. In analyzing the results, although most variables did not show significant difference, but the effects sizeanalyzing of groups showed that in upper body power (ES=0.62), lower body power (ES= 0.64),upper body strength (ES=0.13)and lower body strength (ES=1.84), the results were in favor of accommodation group. This difference in the maximal strength in accommodation group were (62.15% in the upper body, 68.38% lower body) and in constant strength group (86.14% in the upper body, 84.21% in the lower body) respectively. Also the effect size of power for accommodation group were (97.6% upper body, 61.6% lower body) and in constant group (16.4% upper body, 67.4% lower body), respectively. This study showed that in order to increase maximal strength and power, accommodation training method is more effective than traditional constant training.

Back ground: component of time on effectiveness and maintenance of corrective exercise has been always in the center of researchers’ attention. This study aimed to investigate the effect of 8 weeks corrective exercise on lumbar lordosis angle and the changes of the lumbar lordosis angle after a 4 months period in the hyper-lordotic pre pubertal and pubertal school girls .
Methods: The 64 lumbar lordotic schoolgirl (10 and 17 years old)were included that randomly divided into two groups: experimental (n=32) and control (n=32) The experimental groups performed corrective exercise for 8 weeks,3 session a week whereas control groups continued their usual physical and dietary activities. Lumbar lordosis angle values were measured before, after and then 4 months post training period by flexible ruler. Data were analyzed by using the variance analysis with repeated measure and α was 0.05.
Result: The result showed lumbar lordosis decreased in pre pubertal and pubertal girls (p>0.05). The means of lumbar lordosis increased in 2th post test(p>0.05) in experimental groups wheares There were no significant differences between means of lumbar lordosis in these time points in control group (P>0.05(
Conclusion: the result showed corrective exercise effect on lumbar lordosis angle in pre pubertal and pubertal students However, the effectiveness of training in pubertal has been much more effective than pre puberty .Also follow up findings showed the subject are required to participate in continual corrective exercise program and should not abandon training programe with desired result.

Introduction: The present study examined the prevalence of back pain and its association with anxiety and
depression in nurses working in affiliated hospitals to social security organization in Isfahan city.
Research Method: The design of this research was descriptive-correlation and its population consisted of
815 nurses working in Shariati (510 subjects) and Gharazy hospitals (305 subjects). Research sample
included 244 (78 males and 166 females) with age range of 25 to 40 years and mean age 35/3±6/4 years
subjects selected using stratified random sampling method. Visual analog scale of pain questionnaire (VAS),
Katel Anxiety questionnaire and the Beck Depression questionnaire were used. Pearson correlation
coefficient and independent t-test were used in inferential statistic part. The data were analyzed with
significant level of 0/05, by SPSS 16.
Results: The results showed that 55/3% of nurses had mechanical acute or chronic low back pain. There
was a positive and significant correlation between low back pain and anxiety and depression in nurses (P ≤
0.05). Also there was no significant difference between the mean value of pain severity in male and female
nurses.
Conclusion: Due to the relationship between pain, anxiety and depression in nurses, attention to physical
and psychological factors simultaneously in the prevention and treatment of back pain in these patients is
recommended.

Introduction: The aim of this study was to determine the effect of an eight- week aerobic exercise on some immune system factors in patients with rheumatoid arthritis. Twenty – three women (age: 51.96 ± 7.73, weight: 72.37 ± 10 kg) were enrolled in the study voluntarily Methods: In this quasi – experimental random study, subjects were assigned to training and control group. The training group ( n=12)participated in aerobic exercises with the intensity of 65% reserve heart rate on stationary cycle ergometer three days a week. Both groups received the same medication during the study. Differences between groups were analyzed by independent t – test and differences inside groups were analyzed by dependent t-test. Patients' blood samples were taken before and after training period and the frequency of White blood cells, A
immunoglobulin and lymphocyte were also taken by standard methods. Results: After 8 weeks aerobic exercise, there was a significant decrease in white blood cells, BMI and also a significant increase (P<0/05).in A immunoglobulin and lymphocyte in training group. No significant differences were seen in variables between groups )P>0/05).Conclusion: It seems submaximal aerobic exercise can activate some immune system neutralization processes against damage and phagocyte factors.

The aim of this study was to investigate the effect of functional fatigue on the dynamic and static balance of male students aged 15 to 18 with different plantar arch. To measure the subjects' foot arch, the Navicular Drop Test was used. The subjects were then randomly divided into three groups of 22 members with different foot arches. Later on, SEBT test, Modified Stork Balance, Fatigue Protocol and Borg (RPE) scale were run. Using SPSS (version 18), the data were analyzed (p< .05); in particular, dependent t-tests, One-way ANOVA and Scheffe's post hoc test were run. The results showed a significant difference between pre-test and post-test scores of dynamic and static balance in all three groups. Scheffe's post hoc test revealed that there was a significant difference between the mean difference of pre-test and post-test scores of the dynamic and static balance group of normal foot arch, the flat foot arch group and the cavus foot arch group. Meanwhile, the difference between flat and cavus foot group was not statistically significant. Due to the significant reduction in the balance of subjects with abnormal arch, the correction of the abnormality of the foot arch as well as the use of appropriate training courses are recommended to improve their physical fitness.