the effect of body weight , flexibility , balance and muscle strength on vertical jump in athletes and non-athletes

Vertical jump is important for a majority of sports and an indicator for the level of athletic performance and achievements, In this study we investigated the relationship of body weight, flexibility, balance and muscle strength with vertical jump, to gain a better understanding of the factors that may improve vertical jump . 44 participants joined this study in two groups ( athletes group =22 (14males, 8 females), age 21.31±2.2 ) and ( non-athletes = 22 (12 males, 10 females) age 22±2.3 ), measurements for BMI and flexibility ( Sit and reach and ROM ). Balance (flamingo test and Star excursion test). And muscle strength (surface EMG) was taken for all participants in both groups, the vertical jump was performed and measured for each participant. The findings showed that there is a significant relationship between vertical jump height and balance (p<0.05) for both groups. Muscle strength of lower limb muscles tested by EMG has a significant relationship with Vertical jump in both groups (p<0.05). The relationship of balance was significantly stronger in the athletes group while relationship of muscle strength with vertical jump in non-athletes group was stronger. Body weight within the average ranges did not have a relationship with vertical jump, flexibility did not show a significance either. Balance and muscle strength in this reearch to have an effect on vertical jump height in ahletes and non nonathletes as well, while body weight in average ranges and flexibilty did not have a relation with vertical jump height .