Author(s): YU, J., YONG, L. , Institution: BEIJING INSTITUTE OF SPORTS SCIENCE, Country: CHINA, Abstract-ID: 1634

INTRODUCTION:
This study aimed to explore the regularity of interstitial fluid glucose (IFG) changes during different load training and the correlation between IFG and training load, to provide new ideas for training monitoring and precise sugar supplementation.
METHODS:
10 male cyclists from Beijing cycling team, with average age of 15.9±0.7 years old, height of 179.08±4.60cm, weight of 69.33±7.54kg, subjected to take part in this study. All of them had more than 2 years of cycling training experience. Continuous glucose monitoring sensor (CGMs) was placed on the back of the upper arm which area has thicker fat and monitored IFG for 14 days. Body composition, Rest metabolic rate (RMR) and maximum oxygen uptake (VO2max) were measured before training sessions (COSMED K5,America and SRM,Germany). During track cycling, road cycling, treadmill training (Rodby 3500, Sweden) and interval high intensity training (Wattbike, England), athletes’ heart rate(HR) and IFG were monitored. Athletes began exercise between 1.5-2h after meals and had no sugar intake during training and testing. SPSS 26.0 statistics was applied to analyse data. Repeated-measures ANOVA was used to analyse the results of VO2max and IFG over time with p < 0.05 being a significant difference. One-way ANOVA was used to detect the differences of heart rate，RPE and IFG results, with p<0.05 being considered a significant difference. All data are expressed as mean±SEM.
RESULTS:
The results showed that IFG was significantly correlated with RMR ( p＜0.01). IFG was also significantly correlated with VO2 ( p＜0.01) and VCO2 ( p＜0.01). During the VO2max test, IFG values were obtained by scanning every minute. The average IFG value at 6min, 7min and 8min was significantly higher than that at 1min ( p＜0.05, p＜0.05, p＜0.05). Athletes’ average IFG during incremental load exercise ranges from 7.6-8.6 mmol/L. The IFG reached its maximum value at the 8th minute and decreased in the following time. Results showed that the average heart rate of high-intensity interval training on wattbike was significantly higher than that of road cycling class ( p< 0.05). Athletes’ RPE after track cycling and Wattbike training were significantly higher than those of road cycling. The mean value of IFG of track cycling was significantly higher than those of treadmill training, road training and Wattbike training ( p < 0.05, p < 0.01, p < 0.01).
CONCLUSION:
IFG value is positively correlated with RMR, VO2 and VCO2 in the resting state. IFG could reflect the level of basal energy metabolism of athletes. During exhaustive exercise with increasing load, IFG value increased with time and reached the highest level at an average heart rate 161 rpm, then decreased. The results indicated that IFG changed regularly with training load.It was also found that the average value of IFG in track cycling was the highest, suggesting that this training schedule may stimulate the highest carbohydrate-supplying energy efficiency in the body.