LACTATE: A BIOLOGICAL MARKER OF PHYSICAL ACTIVITY IN COLOMBIAN WEIGHTLIFTING ATHLETES

ABSTRACT Introduction Blood biomarkers are measurable metabolic products that allow objective monitoring of the training process, and their analysis provides an opportunity to improve athletic performance. Objective To evaluate blood lactate concentrations in a group of the Valle League weightlifting athletes as a tool to determine the effects of training and its direct relationship to performance during competition. Methods This is an observational cross-sectional study. Lactate levels of 32 weightlifting athletes belonging to the Valle Weightlifting League were evaluated. Blood samples were taken from the ear lobe to quantify the lactate concentration, using a Scout Lactate analyzer. Samples were taken before and after a high intensity training section consisting of four maximum repetition (MR) sports gestures, in which 5 series and 15 repetitions were performed for each sports gesture, with a rest period of 40 seconds between each exercise. The software program SPSS, version 25, was used to determine the lactate concentrations. Results An average lactate concentration 22.46 mg/dL was obtained for the athletes at rest, and an average of 98.30 mg/dL in the final lactate concentration, after high intensity exercise. Significant differences were found between the initial and final lactate concentrations. Conclusion Lactate concentration increases with physical activity; it varies from one individual to another; and it can be used as a biomarker of intensity of physical activity in the field of sports. Level of evidence; II type of study: Prognostic Studies Investigating the Effect of a Patient Characteristic on a disease outcome.

摘要
引言：血液生物标志物（blood biomarkers）是可用于客观监测训练进程的可量化代谢产物，对其开展分析可为提升运动表现提供可行路径。
研究目的：旨在评估瓦莱举重联盟一众举重运动员的血乳酸浓度，以此明确训练的影响效果，及其与赛事中运动表现的直接关联。
研究方法：本研究为观察性横断面研究。纳入隶属于瓦莱举重联盟（Valle Weightlifting League）的32名举重运动员，对其乳酸水平展开评估。采用Scout乳酸分析仪（Scout Lactate analyzer），通过耳垂采血方式量化血乳酸浓度。分别在高强度训练环节前后采集样本；该高强度训练环节包含4项最大重复次数（maximum repetition, MR）动作，每项动作完成5组、每组15次重复，组间休息时长为40秒。采用SPSS 25.0版统计软件分析血乳酸浓度。
研究结果：运动员静息状态下的平均血乳酸浓度为22.46 mg/dL，高强度运动后的最终平均血乳酸浓度为98.30 mg/dL。静息初始与运动后最终血乳酸浓度存在显著统计学差异。
研究结论：血乳酸浓度随体力活动升高而上升，且存在个体差异，可作为体育领域体力活动强度的生物标志物。
证据等级：Ⅱ级；研究类型：探究患者特征对疾病转归影响的预后研究。