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    Effects of Upper Body Anthropometrics and Handgrip Strength on Ball Velocity in Female Handball Players
    (2021) Canlı, Umut; Kurt, Cem; Atalağ, Ozan
    The aim of this study is to analyze the relationship between ball velocity thrown from two different positions, parameters of upper body anthropometrics and hand grip strength as a marker of upper body strength. Twelve well-trained female handball players (age, 22.47±4.57 years; body mass, 66.70±11.05 kg; height, 167.33±7.41 cm; handball experience, 9.91±3.47 years), playing in a team that competes in the first division of the Handball League of Turkey joined this study. Body weight, height, body mass index (BMI), body fat percent and trunk muscle mass, hand length and breadth, sitting height, arm span index and dominant hand grip strength measured by using a stadiometer, bioelectric impedance device, anthropometric set, fiberglass measuring tape and hand grip dynamometer respectively. Ball velocity was measured with a speed radar for both throwing positions (throws are made from a sitting position either with a non-throwing hand on the floor (RP) or non-throwing arm free (RS). According to hierarchical multiple regression analysis carried out; the original contribution of fat percentage, trunk muscle mass, BMI and handgrip strength included in the model in the first step is not significant within the model and both RP and RS were not able to predict ball velocity (p>0.05). It was also determined that hand length, hand breadth, sitting height and arm span index which were included in the model in the second step were not significant and did not predict the ball velocity for both RP and RS as well (p>0.05). However, there was a positive relationship between trunk muscle mass and ball velocity with RP (r = 0.831; p<0.05). No relationship was found between other variables and ball velocity for both RP and RS. According to the results of the study, handball players and their coaches might consider designing resistance training programs that put an emphasis on increasing trunk muscle mass to increase the ball velocity during over arm throws.
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    Investigation of the Relationships between Isokinetic Leg Strength, Sprint and Agility Performance in Collegiate American Football Players
    (2020) Tatlıcıoğlu, Enver; Atalağ, Ozan; Kurt, Cem; Acar, Mustafa Ferit
    Objective: The purpose of this study was to investigate the relationship betweenabsolute isokinetic knee flexion and extension strength, and sprint and agilityperformance in collegiate male American Football players.Materials and Methods: Twenty-six collegiate male players aged 19-27 years withat least a year of experience in playing American Football participated in the study. Theplayers were tested for absolute isokinetic knee flexion and extension peak torque,sprint, and agility performance over two different days with at least 72-hour rest intervalbetween tests. Knee flexion and extension peak torque were measured by means of anisokinetic dynamometer (HUMAC NORM, USA) at angular velocities of 60°·s-1, 150°·s-1,and 300°·s-1 for both knees. Sprint performance was evaluated with 40-yard dash andagility was evaluated with pro-agility tests, respectively.Results: The study demonstrated that 40-yard dash and pro-agility test results did notcorrelate with any measures of isokinetic knee flexion and extension peak torque(p>0.05).Conclusion: The results of this study indicate that isokinetic knee flexion andextension peak torque are not good predictors of sprint and agility performance in malecollegiate American Football players. Additional research that will also evaluate relative(Nm.kg-1) isokinetic strength may be required to elucidate whether a correlationbetween isokinetic strength, and sprint and agility performance or perhaps othermeasures of performance exist for American Football players.