EFFECTS OF SPORTS NUTRITION ON FEMALE COLLEGE STUDENTS’ PHYSICAL FITNESS

ABSTRACT Introduction: Optimizing the physical education training of female college students and maximizing physical fitness are considerable factors in contemporary physical education. It is believed that implementing sports nutrition can elevate the physical fitness of these female students. Objective: Explore the effects of sports nutrition on the physical fitness of female college students during their training period. Methods: 20 volunteers were randomly divided into experimental and control groups, with 10 female college students in each group. The control group had no changes in original living or training habits, while the experimental group was retrained according to the sports nutrition intervention strategy for one month. Results: In the experimental group, whose height was 161.02±5.64 cm, body weight decreased from 55.91±4.61 kg to 54.39±4.45 kg, and vital capacity increased from 44.98±8.61 ml/kg to 52.56±8.91 ml/kg. The body mass index of grip strength increased from 45.18±7.60 to 51.27±9.99 after the experiment. The 50M running time was improved from 8.27±0.49 s before the experiment to 7.98±0.53 s after the experiment, and the horizontal jump time was improved from 164.87±20.40 cm to 168.27±21.24 cm. The 800m running time was improved from 263.55±20.35 s before the experiment to 259.25±29.29 s after the experiment. Conclusion: The intervention strategy in sports nutrition can effectively maximize the gain in the results of female college students. It is indicated to be promoted to spread the optimization of physical training in colleges and universities. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.


INTRODUCTION
Physical education teaching is a key point of current college teaching.Strengthening the construction of students' physique is of great significance to improve college teaching results, enhance national physique and improve national physique. 1However, there is a phenomenon among college students, especially female college students.In order to excessively pursue a slim body, many students choose to go on a diet and eat only a small amount of food every day. 2 Although this form can achieve the goal of weight loss in a short time, it will have a serious adverse impact on students' physical quality in the long run, and is not conducive to the optimization of physical training. 3The literature suggests that appropriate nutrition supplement can improve students' blood glucose level during physical exercise, and then greatly improve students' sports ability.Other literatures suggest that the combination of nutrition intervention and sports training can improve the physical function of college students and enhance their immunity. 4In the context of the normalization of COVID-19 prevention and control, it can greatly improve the ability to resist risks.The literature suggests that the principle of sports nutrition intervention to optimize students' physique is to improve their lipid metabolism level, so as to enhance the body fat consumption rate.In the aspect of cholesterol absorption, effective exercise nutrition intervention can hinder the absorption of intestinal cholesterol, so that excessive cholesterol can be discharged out of the body. 5In this way, the body fat rate can be reduced.Therefore, it can be seen that sports nutrition intervention for college students can effectively improve their physical quality, improve their physiological function, improve their body composition, improve their immunity, and have a lot of help for their daily life.
In view of this problem, this paper, through the form of sports nutrition intervention, combines the optimization of sports training with nutrition intervention, and discusses the optimization of sports comprehensive training of female college students, so as to improve the posture of female college students, promote their nutrition absorption, and improve their physical quality.

METHOD
Before the beginning of the experiment, 20 volunteers were randomly divided into the experimental group and the control group, with 10 female college students in each group.The study and all the participants were reviewed and approved by Ethics Committee of Xi'an Aeronautical Institute (NO.XAAI20Z021).Table 1 shows Basic information of research objects.
First of all, 10 volunteers in the experimental group were counted on food through personal filing.By querying their consumption records of meal cards and mobile phone purchases, the statistics and analysis of various foods and nutrients consumed in the first three days of the experiment were carried out, so as to obtain the nutritional intake before the nutritional intervention.
Then, the exercise nutrition intervention strategy was designed, mainly including adjusting the food intake, scientific proportion, and carrying out certain aerobic exercise for one hour every day.In this experiment, the control experiment was used.The experimental group strictly controlled the food intake and insisted on taking part in sports every day according to the sports nutrition intervention strategy; The control group was carried out according to the previous life training habits and eating habits.This experiment lasted for one month.During the experiment, in order to ensure the effectiveness of the experimental results, the experimental group was carried out in strict accordance with the matched food, and did not take extra snacks.The control group kept the original living habits unchanged to reduce the interference of unrelated factors.

Analysis of sports nutrition intervention
In order to carry out sports nutrition intervention, we must analyze the current diet structure of the experimental group, and then put forward corresponding adjustment methods.
Table 2 shows the intake of different kinds of food before and after nutrition intervention.It can be seen from the table that there are some problems in the current dietary structure of girls.For example, in many dieting concepts, eating vegetables and fruits instead of staple foods and other foods can achieve the purpose of rapid fat reduction.Therefore, in the diet structure before intervention, the proportion of vegetables and fruits is high.And coarse cereals such as sweet potato and taro are also considered as excellent substitutes for staple foods.Therefore, many girls choose to eat these coarse cereals during weight loss, so the proportion of these coarse cereals is relatively high.The corresponding intake of poultry and livestock meat, eggs, aquatic products, milk and products, soybeans and nuts in the normal diet is low.In addition, before the nutritional intervention, the intake of oil in girls is also high.The reasons are: first, the intake of sweets and snacks is too much, and there are some problems in the dietary structure of girls, resulting in the consumption of a large number of sweets and snacks.The oil in these foods has exceeded the standard.In addition, many girls go on a diet during the day to lose weight, but they choose to eat supper at night due to excessive hunger.The supper represented by fried chicken, barbecue and crayfish contains a lot of oil.Therefore, before the nutritional intervention, the oil intake of the experimental group exceeded the standard.
From the comparison of interventions, it can be seen that this nutritional intervention has increased the intake of poultry and livestock meat, eggs, aquatic products, milk and products, soybeans and nuts, so that they can maintain good physical function.At the same time, the intake of vegetables, fruits, Cereals, potatoes, fats and other food types is reduced, especially the intake of fats and oils is controlled, so that it can not only ensure normal physiological and sports activities, but also prevent the adverse effects of high fat on the body.Table 3 shows Comparison of intake of various nutrients before and after nutrition intervention.

Optimization effect of college physical training based on sports nutrition intervention
In order to explore the effect of sports nutrition intervention on the optimization of college girls' physical training, this paper takes the changes of physical fitness test indicators and physical fitness indicators as the research object, and discusses them respectively.
Table 4 shows the impact of sports nutrition intervention on physical fitness test indicators.It can be seen from the table that the weight of the experimental group with a height of about (161.02 ± 5.647) cm decreased from (55.91 ± 4.611) kg before the intervention to (54.39 ± 4.458) kg, and the vital capacity body mass index increased from (44.98 ± 8.619) ml/kg before the intervention to (52.56 ± 8.914) ml/kg, P < 0.05, indicating that there was a significant difference.This shows that good sports nutrition intervention can reduce the body weight of the experimental group and improve its vital capacity body mass index, which further shows that sports nutrition intervention can improve the body shape, cardiopulmonary function and other aspects of college students.Therefore, sports nutrition intervention has a better role in improving the physical quality of College Students.Table 5 shows Effect of sports nutrition intervention on physical fitness indexes.
The comprehensive comparison between the experimental group and the control group shows that the current physical training methods can improve the physical fitness index of the control group to a certain extent, but the growth rate of the experimental group is significantly higher than that of the control group.Therefore, the optimization of college physical training and the combination of nutrition intervention and sports teaching can effectively improve the physical quality of students.

DISCUSSION
At present, there is a mess in nutrition in Colleges and universities.The main reason is the lack of correct nutrition knowledge.Many students lack correct guidance when adjusting their body weight.They often obtain it by consulting various materials and sharing on the Internet.Some of these data sharing lacks scientific basis.Although it can achieve the effect of weight loss in a short time, it has buried the root of the disease in the body.Therefore, the school should publicize the correct nutrition knowledge, provide corresponding consulting services, analyze the nutrition matching, nutrition reference for people with special physique, food intake for people with diseases, etc., help students improve their understanding of nutrition knowledge, solve the nutrition problems needed in life, and prevent the negative impact on their physique due to wrong nutrition knowledge.
The existing sports training mode is often small class system and specialized teaching, that is, according to the actual needs of students, it is divided into basketball, football, volleyball, swimming, badminton, table tennis and other classes, and teaching and training are carried out in the classroom.Although this way of dividing classes according to sports items can more effectively meet students' interests and hobbies, there are also misunderstandings in training.The traditional sports division mode and training mode can not meet the current students' more diversified sports needs.Therefore, this paper puts forward the sports training mode of "integral system".Students are no longer confined to a certain class type, but can make an appointment for relevant classes before class according to their own actual needs.In addition to traditional sports types, courses such as physical improvement, endurance training and body shape adjustment can also be added to meet the more practical needs of current students.Students select this course before the physical education class, and obtain corresponding credit points after successfully completing the course.If the accumulated points reach a certain standard, it means that all the physical education courses of this semester have been completed and passed.Optimizing this sports training mode can make the traditional and task-based sports training courses more interesting, and greatly improve students' enthusiasm for sports learning and training, so as to improve the effect of school sports teaching, improve students' physical test results, and promote the progress of students' physical quality.

Table 1 .
Basic information of research objects.

Table 2 .
Intake of different kinds of food before and after nutrition intervention (g/d).

Table 3 .
Comparison of intake of various nutrients before and after nutrition intervention.