فهرست مطالب

Sports Medicine - Volume:9 Issue:3, 2018
  • Volume:9 Issue:3, 2018
  • تاریخ انتشار: 1397/06/20
  • تعداد عناوین: 9
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  • Jose De Oliveira Vilar Neto *, Carlos Alberto Da Silva, Antonio Barroso Lima, Francisco Jose Rosa De Souza, Daniel Vieira Pinto, Jocasta De Sousa Araujo, Claudio De Oliveira Assumpcao, Elizabeth De Francesco Daher Page 1
    To investigate the effect of low-dose supplementation of creatine monohydrate without the use of the saturation phase, 36 male university students engaged in resistance training (age 22.5 ± 4.3 years, height 1.76 ± 0.08 m, weight 77.0 ± 11.0 kg, and body mass index 24.6 ± 2.5 kg/m2) were randomly divided into three groups: group placebo (GP), group supplemented with creatine 3 g/day (3G), and group supplemented with 5 g/day creatine (5G). The subjects were tested for maximum muscle strength (1RM), upper body muscle endurance (MPU), and abdominal muscle endurance (MSU) before and after 7, 14, 21, 28, and 35 days of creatine supplementation or placebo and performing standardized resistance training. After 35 days of supplementation and training, all groups showed a significant improvement in the 1RM test; however, the percentages of strength increase were significantly higher (P 0.528; G3, P > 0.076; G5, P > 0.148). These results support a number of earlier studies that demonstrated that creatine supplementation at low doses and without the use of the loading phase are effective for increasing maximal strength and endurance of upper limbs.
    Keywords: Nutritional Supplementation, Maximal Strength, Ergogenic Aids, Fatigue Resistance
  • Mandana Gholami *, Mahia Ardestani Page 2
    Background
    It is suggested that quercetin has anti-inflammatory properties and can improve endurance performance, but study results are contradictory especially in human models. Therefore, the purpose of the present study was to evaluate the effect of quercetin supplementation on TNF-α, lactate and immune cell responses after one session of exhausting swimming.
    Methods
    20 trained (at least 3 years’ history of swimming training) female adolescent swimmers with average age of 15.1 ± 0.21 yrs and BMI, 21.05 ± 2.3 kg/m2 were divided in two groups including placebo (n = 10) and quercetin (n = 10) groups. Participants in the quercetin group consumed 1000 mg of quercetin supplement daily for two weeks. After two weeks, all participants took part in one exercise session as swimming with 80 - 85 percent of maximum heart rate until exhaustion. Blood samples were collected at three times (baseline, pre and immediately after exercise) and TNF-α was measured by ELISA method. data were analyzed by SPSS-24 software using repeated-measures ANOVA and paired sample t-test. P
    Results
    Results indicated that immediately after exercise, TNF-α response was significantly lower in quercetin compared to placebo group (P = 001). Lactate immediately after exercise increased in two groups (P = 001) but the difference between two groups was not significant (P > 0.05). Moreover, the quercetin supplement caused change in immune cell response in which the difference in leukocytes and monocytes were significant (P
    Conclusions
    It seems that quercetin can exert anti-inflammatory function after exhausting swimming. Therefore, quercetin can be consumed by athletes to attenuate exercise-induced inflammation.
    Keywords: Inflammation, Supplement, Exercise
  • Mostafa Zarei, Parisa Namazi, Hamed Abbasi, Mahshid Noruzyan, Sara Mahmoodzade, Tohid Seifbarghi * Page 3
    Background
    Soccer is the world’s most popular sport, with most players being younger than 18 years. “FIFA 11 Kids” has been recently introduced to prevent soccer injuries in adolescent players. This program would be more accepted and followed by coaches and players if it were to also promote performance and physical fitness in players. The purpose of this study was to assess the effect of a ten-week FIFA 11 for kids Injury prevention program on performance and physical fitness in adolescent soccer players.
    Methods
    56 adolescent players participated in this study from Tehran province, Iran. They were divided into intervention and control groups. The intervention group underwent 10 weeks of FIFA 11 warm-up exercise for kids, while the control group followed its routine warm-up. Both groups took the slalom dribbling, Illinois, sit and reach, standing long jump, triple hop, Y balance, 40 and 20-yard sprint, plank and side plank tests one week before and after the program.
    Results
    Covariance analysis showed that the intervention group gained significantly better results in Y balance, triple hop distance, and 40-yard speed tests compared to the control group as the result of the ten-week FIFA 11 injury prevention program for kids. No significant difference was seen in the slalom dribbling, Illinois, sit and reach, standing long jump, 20-yard sprint, plank, and side plank between the groups.
    Conclusions
    Y balance, triple hop distance and 40-yard speed tests could benefit from the11 kids program owing to the specificity principle of training; since the main focus of the11 kids program is on plyometric and balance exercises. As the 11 Kids program does not contain the related drills to improve the performance and other fitness components, it is therefore not expected to improve the slalom dribbling, Illinois, sit and reach, standing long jump, 20-yard sprint, plank, and side plank. However, the 11 kid’s program could enhance some of the related physical fitness components such as balance which has been shown to be related to sport injuries and may probably be effective in sport injury prevention.
    Keywords: Injury Prevention Program, Performance, Fitness, Adolescent Players
  • Seyedeh Shelir Hosseini, Hamid Rajabi, Mohammad Ali Sahraian, Mahbubeh Moradi, Keivan Mehri, Maryam Abolhasani * Page 4
    Background
    Muscle weakness, fatigue and balance disturbances contribute to the reduction of daily activity in multiple sclerosis (MS) patients. Therapeutic strategies to promote improvements in muscle strength , functional capacity and balance are limited in individuals with MS. Yoga training (YT) is a most popular mind-body intervention and has been known to positively affect physical, mental and other symptoms of multiple sclerosis patients with moderate disability and other cases. Strength training as a physical exercise has positive effects in performance and some disabilities in these patients.
    Objectives
    This study was designed to determine effect of 8-week home-based YT and resistance training (RT) on muscle strength, functional capacity and balance in 26 patients with MS with mild to moderate disability.
    Methods
    26 male and female patients (Age: 31.3 ± 9.0749) with mild to moderate disability, were recruited and randomized into three groups: Yoga training (n = 9) with three-times weekly home based Hatha Yoga training for eight weeks, Resistance training (n = 9) with three-times weekly home based resistance training program for eight weeks and control groups (n = 8).
    Results
    The data analyzed using one way ANOVA showed; however, that YT had no significant effect on leg extensor muscle strength, but home RT increased it. Also, functional capacity was not affected by either YT or RT, but the balance changed specially with YT.
    Conclusions
    In conclusion, it seems that prescribing regular training programs with controlled intensity and time, particularly RT and Hatha yoga training can have a positive impact on the lower limbs strength and some degree of balance improvement in multiple sclerosis patients.
    Keywords: Resistance Training, Functional Capacity, Yoga, Balance, Multiple Sclerosis
  • Carlos De La Fuente *, Carlos Cruz-Montencinos, Roberto Pena Y. Lillo, Claudio Chamorro, Hugo Henriquez, Rodrigo Ramirez-Campillo Page 5
    Background
    Advances in micro-electromechanical systems have made the massive use of isoinertial accelerometry units (IAU) possible in multiple fields. Particularly, in sport and sport-rehabilitation contexts, jumping is now commonly assessed through IAU. However, due to the noise contained in the register, the treatment for signals coming from IAUs may affect the mechanical outputs such as work or power, which need simple and double integration of the accelerometry signal to obtain it.
    Objectives
    To determine the most appropriate (stable) cut-off low pass Butterworth filter parameters for unweight and propulsion phases to treat signals from a countermovement jump.
    Methods
    Twenty-seven recreational athletes (age, 20.5 ± 3.0 years; body mass index, 21.9 ± 2.2 kg/m2) were assessed using an IAU (iPhone IV®) attached at the sacrum level to obtain mechanical output from the acceleration signals during countermovement jumping. To select the most stable cut-off filter parameters during the unweight and propulsion phases of the jumps, the following criteria were used: 80 - 95% of accounted variance of correlation coefficients determined between the raw and filtered signal, and individual variance lower than 5% for simple and double integration.
    Results
    The cut-off low pass interval of 8 - 13 Hz generated 80.8 - 94.5% in the accounted variance and individual variance lower than 5%.
    Conclusions
    An 8 - 13 Hz cut-off low pass filter is more appropriate to treat isoinertial accelerometry signals during jumping.
    Keywords: Accelerometry, Countermovement Jump, Variance
  • Fardin Mirzatolooei, Ali Tabrizi *, Faez Bagheri, Maryam Sadat Mokaram Gargari Page 6
    Background
    Many grafts are used for ACL reconstruction with different methods of fixation. We have presented a new technique for BTB (bone-tendon-bone) graft preparation and compared its biomechanical properties with the classic one to see if the suspensory method of fixation is applicable for BTB grafts.
    Methods
    Eight fresh frozen human BTB grafts were prepared. Grafts were randomly divided into two separate groups. Each containing 4 grafts. In the first group grafts were prepared with standard BTB graft method and in the second group grafts were prepared with new enfolded method. All the grafts were assembled in a universal testing machine for testing the mechanical properties of the grafts. Maximum tensile strength, failure load and failure mode were derived from machine and the values were compared in each group.
    Results
    Mean failure load for classic group was 1660.25 and for enfolded group it was 1579.25 (P = 0.25). Mean stiffness for classic group was 285.25 N/meter and for enfolded group it was 268.75 N/ per meter (P = 0.1). In classic group, all failures happened at the bone-ligament junction. In the enfolded group, failures also occurred through the tendino-osseous junction except for one case.
    Conclusions
    Enfolded BTB graft preparation had the same biomechanical indexes of classic method. Therefore this graft preparation method can be used for ACL ligament reconstruction surgery with used of suspensory fixation by Endobutton.
    Keywords: Anterior Cruciate Ligament, BTB graft, Hamstring graft, Endobutton, Biomechanics
  • Daniel Hoffman *, Sam Robertson, Pitre Bourdon, Andrew Douglas, Paul Gastin Page 7
    Background
    The increasing focus on international sporting success has led to many countries introducing sport schools and academies. Limited empirical evidence exists that directly compares student-athletes from different continents. This study investigated whether male Australian and Qatari student-athletes differ in anthropometry, physical fitness and biological maturity.
    Methods
    150 male student-athletes (72 Qatari, 78 Australian; age = 11.8 - 18.6 y) completed a fitness testing session involving anthropometric (standing height, sitting height, leg length, body mass, peak height velocity (PHV) measures) and physical capacity (40 m sprint, countermovement jump (CMJ), predicted maximal oxygen uptake (VO2 max) tests. Differences were assessed using a one-way multivariate analysis of variance (MANOVA), effect size (Cohen’s d) and regression coefficients.
    Results
    The Australian student-athletes possessed a greater standing height and body mass (P
    Conclusions
    Despite lower stature and body mass values, Qatari student-athletes exhibited physical fitness ascendancy over their Australian counterparts.
    Keywords: Student, Athlete, Body Size, Physical Fitness, Biological Maturity, Sport
  • Nabi Motallebi *, Kamelia Davoodzadeh, Somayeh Borjalilu, Bahareh Kashanimovahhed, Mahdi Anbari, Hossein Nikfarjad, Alireza Bahrami, Kamran Bagheri Lankarani Page 8
    Background
    The promotion of sport and physical education is an important step in a country’s development; and sport, due to its role in the individual’s personal and social life, is of special importance to people and governments. Sport is a socio-cultural entity which affects social organizations and structures. On one hand, the level of a country’s social and cultural development can be judged by sport; and on the other hand, improvement in sport is dependent on the existing capacities in the society.
    Objectives
    With the rapid growth of cyberspace in our country, this study was performed to identify the most effective aspects of cyberspace for increasing the prevalence of sports in Iran.
    Methods
    This study uses a qualitative approach, in which 35 of either the sports managers of medical science universities with education in sports, master’s degree level sports experts, physical education experts or former national team member sports veterans were chosen in a purposeful matter and interviewed in a semi-structured way. Data analysis was performed through content analysis using open coding and axial coding.
    Results
    After assessment of the content of the interviews, 5 influential aspects in sport promotion were identified. These consisted of providing information, education, and network of relationships, cultural improvement and motivation. 20 sub-categories were also considered.
    Discussion
    These findings can provide the necessary information for planning and appropriate use of the country’s virtual space potential in order to further promote sports and exercise.
    Keywords: Exercise, Sport, Internet
  • Farzin Halabchi, Lida Hosseini, Jayran Zebardast, Tohid Seif - Barghi * Page 9
    Background
    Today, more than ever before we need to encourage people for behavior change toward healthy behaviors and active lifestyle. Using the power of branding, we launched a health campaign to send out health messages to the population.
    Objectives
    The aim of this report was to present data from a new experience in science communication of health concerns for adults.
    Methods
    The “health and life” campaign covered different areas of physical, psychological, social and environmental health issues to promote an active lifestyle. Generally, in monthly sessions, we presented 45 - minute talks by health experts on a specific health topic (e.g., smoking, healthy diet) and people with an interesting experience related to the topic were given a time to talk about their story. Participants and lecturer’s information were gathered between January 2013 and July 2017 by on-site registration.
    Results
    Until July 2017, a total of 54 events have been held with a total number of 41566 audiences. Preliminary results indicated that 86-92 % of participants have reported a high level of satisfaction about the quality of health talk program.
    Conclusions
    Through this paper, we presented a new health campaign (health and life campaign) that uses social marketing strategies to promote healthy lifestyle among a wide range of population.
    Keywords: Physical Activity, Sedentary Lifestyle, Health Promotion