A Study On The Effects Of Two Types Of Amplitude Of Motion Deep Squat Training On The Explosive Strength And Maximal Strength Of Lower Limbs In College Students

Research objectives: In this paper,we will verify the effects on lower extremity explosive index and maximal strength by controlling for different squat amplitudes by training subjects with two different amplitude of motion squats.The main performance is to analyze the effect of 0-120° full range of motion deep squat and 0-60° partial range of motion deep squat on lower extremity explosive indexes(height,peak force,peak power)and maximal strength through three angles of initial jump(self-selected squat angle),110° and 90° squat jump with reverse vertical jump and deep squat 1RM.To investigate more effective methods for improving lower extremity explosive power and maximal strength in the deep squat mode,and to provide more effective training strategies for people who improve lower extremity explosive power and maximal strength.Research methods: In this paper,a total of 30 undergraduate or graduate student volunteers(mean age 21.2±1.9 years,mean height 178.2±4.3 cm,mean weight71.1±8.4 kg,mean BMI 22.3±2.3 kg)majoring in physical education as well as athletic training at the Capital Institute of Physical Education were selected using literature,experimental,and mathematical and statistical methods per square meter)participated in this study.Subjects will be randomly divided into 2 groups,15 in the0-120° full-range-of-motion squat group and 15 in the 0-60° partial-range-of-motion squat group.During the first week of the familiarization experiment,the subjects will be tested for 1RM deep squat and lower extremity explosive strength indices for squat jump and reverse vertical jump at self-selected angles,squat 110° and squat 90°,and after 4 weeks of training,1RM deep squat will be obtained to understand strength development,and after 8 weeks of training,1RM deep squat and lower extremity explosive strength indices for squat jump and reverse vertical jump at self-selected angles,squat 110° and squat 90° will be obtained again.The test results were compared and analyzed.Results:(1)After eight weeks of cyclic deep squat training with different ranges of motion,there were statistically significant(P<0.00)before and after differences in the 1RM measured in the fourth and eighth weeks under 0-120° full range of motion squat training;except for peak power and peak strength of90° squat jump,which were not statistically significant(P>0.05),Statistically significant(P<0.05)differences were found between squat jumps and reverse vertical jumps in the initial angle,110°,and 90° on other explosive power indicators before and after.In the 0-60° partial range of motion squat training,the differences between the1 RM measured in the fourth and eighth weeks were statistically significant(P<0.00);in the initial angle squat jump and reverse vertical jump,all indicators were not statistically significant(P>0.05)except for the difference in the height of the reverse vertical jump(P<0.05);in the 110° squat jump and reverse vertical jump,all indicators were statistically significant(P<0.05).In the 90° squat jump and reverse vertical jump,the differences between all indicators were not statistically significant(P>0.05),but the data showed some increase compared with that before training.(2)After eight weeks of periodic different range of motion squat training,the 0-120° full range of motion squat training group had a better 1RM than the 0-60° partial range of motion squat training group in the eighth week and the difference was statistically significant(P<0.05);in the reverse vertical jump,the 0-120° full range of motion squat training group had higher explosive indexes in the initial angle,110° and90° than the 0-60 The 0-60° partial-range-of-motion squat training group had higher explosive force indexes than the 0-120° full-range-of-motion squat training group at110° and 90°,except for the initial angle of the squat jump.(3)After eight weeks of periodic deep squat training with different ranges of motion,the explosive force indexes of the reverse vertical jump and squat jump at the initial angle,110°,and 90° were compared,and the explosive force indexes of the squat jump and reverse vertical jump in the 0-120° full-range-of-motion squat training group were better than those at the initial angle,110°,and 90°,and the explosive force indexes of the 0-60° partial-range-of-motion squat training group at the initial angle,110°,and 90°.The explosive force indexes on 110° and 90°.(4)The 0-60° partial-range-of-motion squat group showed better explosive force indices on the 110° squat jump than on the initial angle and 90° squat jump,but slightly lower compared to the 0-120° full-range-of-motion squat group on the initial angle.Conclusions:(1)After eight weeks of cyclic deep squat training with different ranges of motion,the subjects showed different degrees of improvement in each explosive index of the lower extremity as well as 1RM.(2)After eight weeks of cyclic deep squat training with different ranges of motion,the explosive indexes and 1RM of the lower limb in the 0-120° full range of motion squat training group were better than those in the 0-60° partial range of motion squat training group.(3)After eight weeks of cyclic deep squat training with different ranges of motion,each explosive index of the squat jump and squat jump performed best at the initial angle of the 0-120° full-range-of-motion squat training group.(4)0-60° partial-range-of-motion deep squat training produced adaptive effects on their specific joints,but their lifting effect was weaker than 0-120° full-range-ofmotion deep squat training.