Changes in Urinary Short-Chain Fatty Acid Levels in Male Young Adults of Different Training Levels after Weighted Cross-Country Running
OBJECTIVE:This study aimed to investigate the variations in urinary short-chain fatty acids(SCFA)concentrations before and after weighted cross-country running in male young adults with different training levels,providing insights for sports monitoring and assessment.METHODS:The research employed literature review,experimental methods,and statistical analysis.A total of 20 young adults(age:22.57±1.63 years,height:175.28±4.58 cm,weight:66.95±5.36 kg)were divided into two groups based on their training levels:high training(HT)group and low training(LT)group.Both groups completed a 15 km weighted cross-country run with a 10 kg load,and heart rate during exercise was recorded.Urine samples were collected before and after exercise to measure SCFA concentrations.RESULTS:There were no significant differences in heart rate,excess oxygen consumption,and exercise impulse between the HT and LT groups during exercise(P＞0.05).Compared to pre-exercise levels,the LT group exhibited a significant increase in acetic acid and butyric acid concentrations immediately after exercise(P＜0.05).Moreover,the LT group showed significant elevations in acetic acid,propionic acid,butyric acid,and isobutyric acid levels on the morning of the following day(P＜0.05).The HT group demonstrated a significant increase in butyric acid concentration immediately after exercise(P＜0.05),and significant elevations in isobutyric acid,isovaleric acid,and caproic acid levels on the morning of the following day(P＜0.05).In inter-group comparisons,the HT group had significantly higher acetic acid and butyric acid concentrations before exercise compared to the LT group(P＜0.05).Immediately after exercise,the HT group had significantly lower acetic acid,butyric acid,and valeric acid concentrations compared to the LT group(P＜0.05).Additionally,propionic acid concentration on the morning of the following day was significantly lower in the HT group compared to the LT group(P＜0.05),while caproic acid and caprylic acid levels were significantly higher in the HT group(P＜0.05).CONCLUSION:Urinary SCFA concentrations exhibited variations in male young adults with different training levels before and after weighted cross-country running,suggesting that SCFA could potentially serve as biomarkers for evaluating training levels and exercise responses.
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