زمينه و هدف: يكي از عوامل تأثيرگذار در موفقيت و بهبود ركورد ورزشكاران، گرم كردن است. پتانسيل پس فعالسازي يكي از روشهاي نوين گرم كردن است. ﻫﻨﮕﺎم فعاليتهاي ﺳﺮﯾﻊ و ﭘﻮﯾﺎ، فعالسازي عصبي- عضلاني ﺑﺎﻻﯾﯽ وﺟﻮد دارد و تمرينات ﺑﺎ ﺑﺎر بيشينه، باعث فعال شدن سيستم عصبي ﻣﺮﮐﺰي و اﯾﺠﺎد ﺷﺮاﯾﻄﯽ ﻣﻨﺎﺳﺐ ﺑﺮاي اﺟﺮاي فعاليتهاي اﻧﻔﺠﺎري ميشوند. هدف از تحقيق حاضر، بررسي تأثير پتانسيل پس فعالسازي در زمانهاي استراحتي متفاوت، بر توان انفجاري دختران ورزشكار بود. روش تحقيق: در اين تحقيق نيمه تجربي، 12 دختر ورزشكار (ميانگين شاخص توده بدني 4/40±21/1 كيلو گرم بر متر مربع و سن 1/98±23/28 سال) ﺁﺯﻣﻮﻥ ﭘﺮﺵ ﻋﻤﻮﺩﻯ معكوس (CMJ) را با استفاده از صفحه نيروسنج اجرا كردند. پس از آن، حركت اسكوات با 3 تكرار و شدت 85 درصد يك تكرار بيشينه انجام شد و بعد از 30 ثانيه استراحت غيرفعال، مجدداً آزمون CMJ به عمل آمد. در ادامه، همين آزمون با زمانهاي 1، 2، 3 و 5 دقيقه استراحت غيرفعال انجام گرديد. براي تعيين طبيعي بودن دادهها از آزمون شاپيرو-ويلك و براي تجزيه و تحليل داده ها، از روش آماري تحليل واريانس با اندازه گيري هاي تكراري و آزمون تعقيبي بونفروني استفاده شد. كليه بررسي هاي آماري با نرمافزار SPSS نسخه 23 به اجرا درآمد و سطح معنيداري 0/05
چكيده لاتين :
Background and Aim: Warm-up is one of the factors that influence the success and improvement of athletes record. The
post-activation potentiation can be considered as one of the new methods of warm-up. During fast and dynamic activities, there
is a high level of neuromuscular activation, so the exercises with maximum loads can activate the central nervous system to create
suitable condition for explosive activity. The purpose of this study was to investigate the effect of post-activation potentiation
in different rest periods on the explosive power of athlete girls. Materials and Methods: In this semi-experimental study, 12
female athletes (mean body mass index 21.1 ± 4.40 kg/m2, and age 23.28 ± 1.98 years) performed a countermovement Jump test
using force plate. Then, they performed the squat movement with three repetitions, with 85% of one maximum repetition, and after
30 seconds of passive rest, they repeat the same countermovement Jump test. After that, the same test was carried out with one,
two, three, and five minutes passive rest. For statistical analysis, the Shapiro-Wilk normality test and analysis of variance with
repeated measure method and Bonferron’s post hoc test were used. All statistical analyzes were performed by SPSS soft
wareand significant level set at p<0.05. Results: The results indicated that the reverse countermovement jump in post-tests
were significantly higher at 30 second (p=0.001), 1 minute (p=0.001), 2 minutes (p=0.001) and 3 minutes (p=0.001) compared
to pre-test; but despite a slight increase in countermovement jump with 5 minutes rest, this test did not change significantly
(p=0.43) compared to the pre-test. Conclusion: It seems that the use of squat movement after warm-up will increase the
explosive performance, which can be beneficial in power, speed and explosive power sports.