Effect Of Exercise Training Combined With Probiotic Fermented Milk On Anaerobic Ability And Strength Quality Of Female Cross-country Skiers In Shaanxi Province

Research objectives:In this study,based on the above characteristics of cross-country skiing sports,combined with the effect of probiotics on dietary nutrients,and given different doses of probiotics during athletes’4-week exercise training period,the changes of body composition,anaerobic capacity and strength quality and other related indicators of athletes in the two groups were analyzed,in order to improve athletes’anaerobic capacity and strength quality during exercise training.Therefore,the application field and research object of probiotic intervention were supplemented and verified.Research methods:(1)Intervention method:Normal diet,no other nutritional products were allowed.The experimental group and the control group were supplemented with Functional Probiotic Flavoured Fermented Milk(containing active probiotics≥1X10~9CFU/100g)and Regular Probiotic Flavoured Fermented Milk(containing active probiotics≥1X10~8CFU/100g)four times a day from Monday to Sunday and at night before bedtime.(2)Experimental test methods:(1)Body composition test.The test was carried out by a professional laboratory teacher in the early morning before and after the intervention in a fasting state,in strict accordance with the manual of the instrument.(2)Anaerobic capacity test.The anaerobic power test was conducted before and after the intervention in accordance with the Wingate anaerobic power test requirements and procedures.(iii)Isometric strength test.The isometric strength of the knee and ankle joints was tested before and after the intervention using the ISOMED2000 isometric tester at 60°/s angular velocity and 180°/s angular velocity respectively.(4)Strength quality tests.The subjects were tested before and after the intervention according to the standardised test methods and requirements for vertical vertical jump,standing long jump,bench press maximum and deep squat maximum respectively.Research results:(1)After the intervention,the protein of the athletes in the experimental group was significantly higher than that before the intervention(P<0.05);the indicators of body composition in the control group did not change significantly;the trend of the increase of the indicators of body composition in the experimental group was slightly higher than that in the control group,but there was no significant change.(2)After the intervention,athletes in the experimental group had significantly higher maximum and mean power for 15s anaerobic work than before the intervention(P<0.01,P<0.05)and significantly lower fatigue index(P<0.05);maximum power in the control group was significantly higher than before the intervention(P<0.01);the trend of maximum power growth in the experimental group was significantly higher than that in the control group(P<0.05).in the 30s anaerobic work test Maximum power,mean power and peak blood lactate were significantly higher in the experimental group than before the intervention(P<0.01);maximum power was significantly higher in the control group than before the intervention(P<0.05);and the trend of maximum power growth was significantly higher in the experimental group than in the control group(P<0.05).(3)After the intervention,the total left knee flexion and extension work,left and right knee flexion and extension peak force distance of the 60°/s angular velocity of the knee of the athletes in the experimental group increased significantly(P<0.05,P<0.01)compared with that before the intervention;the total left and right knee flexion and extension work and left knee flexion peak force distance and right knee extension peak force distance of the control group increased significantly(P<0.01).Compared with the pre-intervention period,the total work of flexion and extension of the left ankle,the total work of extension of the right ankle,the peak force distance of flexion and extension of the left ankle and the peak force distance of flexion and extension of the right ankle were significantly increased in the post-intervention ankle 60°/s acceleration test in the experimental group(P<0.01);the total work of flexion of the left ankle,the total work of extension of the right and left ankles,the peak force distance of extension of the left ankle and the peak force distance of flexion and extension of the right ankle were significantly increased in the control group(P<0.01,P<0.05)The trend of increase in total right ankle extension work was significantly higher in the experimental group than in the control group(P<0.05).Compared to the pre-intervention period,the experimental group showed a significant increase in the total knee flexion and extension work and peak knee flexion and extension force distances in the 180°/s angular acceleration test(P<0.01);the control group also showed a significant increase in the total knee flexion and extension work and peak knee flexion and extension force distances(P<0.01 and P<0.05).In the post-intervention ankle 180°/s angular acceleration test,the total work in flexion and extension of the right and left ankle joints and the peak force distance in flexion and extension of the right and left ankle joints increased significantly in the experimental group compared to the pre-intervention group(P<0.01);the total work in flexion and extension of the right and left ankle joints and the peak force distance in flexion and extension of the right and left ankle joints increased significantly in the control group(P<0.01).Compared with the pre-intervention period,the experimental group athletes’vertical jump,bench press maximum and deep squat maximum increased significantly after the intervention(P<0.01);the control group athletes’vertical jump,bench press maximum and deep squat maximum increased significantly(P<0.01 and P<0.05).the experimental group’s deep squat maximum increased significantly more than the control group(P<0.05).(4)After the intervention,the vertical long jump,bench press maximum and deep squat maximum were significantly greater in the experimental and control groups than before the intervention(P<0.05,0.01),and the vertical long jump was slightly greater than before the intervention(P>0.05).The percentage increase in deep squat max was significantly greater in the experimental group than in the control group(P<0.05),and the vertical vertical jump,vertical jump and bench press max were slightly higher than in the control group(P>0.05).Research conclusion:(1)4 week exercise training combined with a functional probiotic-flavoured fermentation intervention better improves body composition,protein,skeletal muscle and lean body mass in cross-country skiers.(2)4 weeks of exercise training combined with a functional probiotic flavour fermentation intervention can better improve anaerobic metabolic capacity in cross-country skiers.(3)4 weeks of exercise training combined with a functional probiotic flavour fermentation intervention can better improve maximal strength and strength endurance in cross-country skiers.(4)4 week exercise training combined with a functional probiotic flavour fermentation intervention can better improve the specific strength of cross-country skiers.