Effects of prolonged running on physiological determinates in trained endurance runners with and without a running pack

Raw data deposited for project entitled 'Effects of prolonged running on physiological determinates in trained endurance runners with and without a running pack'Project abstractUltra trail running (UTR) involves races exceeding marathon distance on off-road undulating terrain and requires mandatory equipment and nutrition to be carried in backpacks. The effect of this load carriage on RE, other physiological metrics and durability of these across prolonged level and uphill running is unclear, particularly in well trained trail runners.Nine well-trained trail runners (age 30 ± 4.6 years, V̇O₂max 65.7 ± 9.1) performed two 100-min runs on a motorized treadmill at 90% of lactate threshold 1 (LT1) with and without a 2.5kg weighted vest. Running economy (RE), heart rate (HR), lactate (BLa), RPE, and core temperature were measured at three timepoints during level and short uphill bouts (10% gradient, 4 mins).Wearing a weighted vest found a significant condition x time interaction for HR at 55 (p = 0.01) and 96 mins (p = 0.02) compared to 14mins during level running, and a significant main effect for uphill running (p = 0.005). No significant effects of wearing a vest were observed for other parameters. Independent of condition, BLa, RER, and RPE, increased over time for both level and uphill running.This was the first study to assess the impact of load carriage on physiological durability on level and uphill running. Carrying a 2.5kg weighted vest elevated cardiovascular responses at notes timepoints for both gradients. But did not affect RE, BLa, RPE, Tcore, VE, or their durability over 100 mins. These findings offer practical insights into expected heart rate responses to modest load in well-trained trail runners.© the authors本数据集对应题为《长期跑步对有无负重跑步背包的优秀耐力跑者生理指标的影响》的研究项目。项目摘要：超级越野跑（Ultra Trail Running, UTR）指在非铺装起伏地形举办的超马拉松距离赛事，要求参赛者通过背包携带强制装备与补给物资。目前尚不清楚此类负重对跑步经济性（Running Economy, RE）、其他生理指标，以及长期平地与上坡跑步过程中这些指标的耐久性的影响，针对优秀越野跑者的相关研究尤为匮乏。九名优秀越野跑者（年龄30±4.6岁，最大摄氧量V̇O₂max 65.7±9.1）完成两次100分钟的跑步机跑步实验，运动强度为乳酸阈值1（Lactate Threshold 1, LT1）的90%，分别穿戴2.5kg负重背心与不穿戴负重背心。在平地及短距离上坡（坡度10%，时长4分钟）跑步过程中的三个时间点，分别测量跑步经济性（Running Economy, RE）、心率（Heart Rate, HR）、血乳酸（Blood Lactate, BLa）、自觉劳累分级（Rating of Perceived Exertion, RPE）与核心体温。与平地跑步第14分钟的基线水平相比，穿戴负重背心在第55分钟（p=0.01）与第96分钟（p=0.02）时的心率存在显著的条件×时间交互效应，且上坡跑步存在显著的主效应（p=0.005）。未观察到穿戴负重背心对其余实验参数存在显著影响。无论负重状态如何，血乳酸、呼吸交换率（Respiratory Exchange Ratio, RER）与自觉劳累分级均随跑步时长增加而升高，该趋势在平地与上坡跑步中均存在。本研究为首次评估负重对平地与上坡跑步过程中生理指标耐久性影响的实验。穿戴2.5kg负重背心会提升两种坡度下各测试时间点的心血管反应，但未对跑步经济性、血乳酸、自觉劳累分级、核心体温、每分通气量（Ventilation, VE）及其100分钟跑步过程中的耐久性产生影响。本研究结果可为优秀越野跑者预估适度负重下的心率变化提供实用参考。© 本文作者