تاثیر خستگی وامانده ساز بر دامنه نیروی عکس‌العمل زمین در کشتی گیران تیم ملی در طی دویدن

ﻣﻘﺪﻣﻪ: اﺛﺮ ﺧﺴﺘﮕﯽ ﻋﻀﻼت اﻧﺪام ﺗﺤﺘﺎﻧﯽ ﺑﺮ ﺗﻐﯿﯿﺮات ﺗﻮزﯾﻊ ﻓﺸﺎر ﺑﺮ داﻣﻨﻪ ﻋﮑﺲ اﻟﻌﻤﻞ زﻣﯿﻦ در ﻫﻨﮕﺎم راه رﻓﺘﻦ ﺑﻪ روﺷﻨﯽ ﻣﻄﺎﻟﻌﻪ ﻧﺸﺪه اﺳﺖ. ﻫﺪف ﺗﺤﻘﯿﻖ ﺣﺎﺿﺮ ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ ﺧﺴﺘﮕﯽ واﻣﺎﻧﺪه ﺳﺎز ﺑﺮ داﻣﻨﻪ ﻧﯿﺮوی ﻋﮑﺲاﻟﻌﻤﻞ زﻣﯿﻦ در ﮐﺸﺘﯽ ﮔﯿﺮان ﺗﯿﻢ ﻣﻠﯽ در ﻃﯽ دوﯾﺪن اﺳﺖ. روش ﺗﺤﻘﯿﻖ: روش اﯾﻦ ﺗﺤﻘﯿﻖ از ﻧﻮع ﻧﯿﻤﻪ ﺗﺠﺮﺑﯽ ﺑﻮ د. ﺟﺎﻣﻌﻪ آﻣﺎری ﻣﺮدان ﺑﺎ ﻣﺤﺪوده ﺳﻨﯽ 18ﺗﺎ 22ﺳﺎل ﻋﻀﻮ ﺗﯿﻢ ﻣﻠﯽ ﮐﺸﺘﯽ ﺑﻮدﻧﺪ. از ﺻﻔﺤﻪ ﻧﯿﺮوی ﺑﺮﺗﮏ ﺑﺎ ﻧﺮخ ﻧﻤﻮﻧﻪ ﺑﺮداری 1000ﻫﺮﺗﺰ ﺑﺮای ﺛﺒﺖ ﻧﯿﺮوی ﻋﮑﺲ اﻟﻌﻤﻞ زﻣﯿﻦ ﻃﯽ دوﯾﺪن اﺳﺘﻔﺎده ﺷﺪ. ﺑﺮای ﭘﺮوﺗﮑﻞ ﺧﺴﺘﮕﯽ از ﭘﺮوﺗﮑﻞ واﻣﺎﻧﺪه ﺳﺎز ﺑﺮوس اﺳﺘﻔﺎده ﺷﺪ و از آزﻣﻮن ﺗﺤﻠﯿﻞ وارﯾﺎﻧﺲ ﺑﺮای ﺗﺤﻠﯿﻞ دادهﻫﺎ اﺳﺘﻔﺎده ﺷﺪ. ﯾﺎﻓﺘﻪ ﻫﺎ: ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد اوج ﻧﯿﺮوی داﺧﻠﯽ-ﺧﺎرﺟﯽ در ﻫﻨﮕﺎم ﺗﻤﺎس ﭘﺎﺷﻨﻪ ﭘﺎ ﺑﺎ زﻣﯿﻦ در ﻃﯽ ﻗﺒﻞ و ﺑﻌﺪ از ﺧﺴﺘﮕﯽ دارای اﺧﺘﻼف ﻣﻌﻨﺎداری ﺑﻮد(0/028= p ). زﻣﺎن رﺳﯿﺪن ﺑﻪ اوج ﻋﻤﻮدی در ﻫﻨﮕﺎم ﺟﺪا ﺷﺪن ﭘﺎﺷﻨﻪ ﭘﺎ ﺑﺎ زﻣﯿﻦ در ﻃﯽ ﻗﺒﻞ و ﺑﻌﺪ ﺧﺴﺘﮕﯽ از ﻧﻈﺮ آﻣﺎری دارای اﺧﺘﻼف ﻣﻌﻨﺎداری ﺑﻮد ( 0/049= p). ﺑﺎ اﯾﻨﺤﺎل ﺗﺎﺛﯿﺮ ﻋﺎﻣﻞ ﺧﺴﺘﮕﯽ ﺑﺮ ﻣﺘﻐﯿﺮﻫﺎی اﯾﻤﭙﺎﻟﺲ و ﻧﺮخ ﺑﺎرﮔﺬاری ﻋﻤﻮدی از ﻟﺤﺎظ آﻣﺎری ﻣﻌﻨﺎدار ﻧﺒﻮد (p>0.05). ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﻧﯿﺮوی داﺧﻠﯽ- ﺧﺎرﺟﯽ در ﻣﻘﺎﯾﺴﻪ ﺑﺎ دﯾﮕﺮ ﻣﻮﻟﻔﻪ ﻫﺎی ﻋﻤﻮدی دارای اﺧﺘﻼف ﻣﻌﻨﺎداری ﻣﯽ ﺑﺎﺷﺪ.ﻧﺘﯿﺠﻪ ﮔﯿﺮی: ﺑﻪ ﻃﻮر ﮐﻠﯽ ﻣﮑﺎﻧﯿﮏ دوﯾﺪن ﺑﺮ داﻣﻨﻪ ﻧﯿﺮوی ﻋﮑﺲ اﻟﻌﻤﻞ زﻣﯿﻦ در ﻗﺒﻞ و ﺑﻌﺪ از ﺧﺴﺘﮕﯽ ﮐﺸﺘﯽ ﮔﯿﺮان ﺗﺎﺛﯿﺮﮔﺬار ﺑﻮد.

the effect of exhausting fatigue on the amplitude of ground reaction force during running in national team wrestlers

purposes: the effect of lower limb muscle fatigue on changes in pressure distribution on the ground reaction range during running has not been clearly studied. the purpose of this research is to investigate the effect of fatigue on the range of ground reaction force in national team wrestlers during running. method: the method of this research was semi-experimental. the statistical population of this research was made up of men with an age range of 18 to 22 who were members of the national wrestling team. a bartek force plate with a sampling rate of 1000 hz was used to record the ground reaction force during running. the bruce exhaustion protocol was used for the fatigue protocol. findings: the results showed that there was a significant difference between the peak internal-external force during heel contact with the ground before and after fatigue (p = 0.028). the time to reach the vertical peak when the heel separates from the ground, had a statistically significant difference before and after fatigue (p = 0.049). also, the findings showed that the fatigue factor for the variables of impulse and vertical loading rate was not statistically significant (p>0.05). the results showed that internal-external force has a significant difference compared to other vertical components. conclusion in general, the mechanics of running on the range of the ground reaction force were significant before and after the fatigue of the wrestlers.