Effects of High-Intensity Interval Training on Running Economy, Lactate Threshold, and Time-to-Exhaustion in Trained Distance Runners
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Abstract
This study examined whether replacing a modest portion of habitual endurance running with structured high-intensity interval training (HIIT) improves running economy, lactate-threshold velocity, and time-to-exhaustion in trained male distance runners. Twenty-eight trained male runners were randomized to HIIT (n = 14) or to a control group (n = 14) for 8 weeks. The HIIT group completed two supervised weekly sessions, progressing from 4 x 3 min to 6 x 3 min at 90-95% of VO2max velocity, separated by 2-min active recoveries, while reducing easy mileage to keep weekly training time comparable with the control group. The control group maintained habitual endurance training. Running economy at 12 and 14 km/h, blood lactate during submaximal running, velocity at 4 mmol·L-1 blood lactate, VO2max, velocity at VO2max, time-to-exhaustion at velocity at VO2max, and 5-km time-trial performance were measured before and after training. Group-by-time effects were assessed using mixed repeated-measures analysis of variance, with significance set at p < 0.05. HIIT produced greater improvements than control in running economy at 14 km/h (-3.8% vs -0.6%, p < 0.001), velocity at 4 mmol·L-1 lactate (+4.2% vs +1.1%, p < 0.001), time-to-exhaustion (+15.8% vs +2.8%, p < 0.001), and 5-km time-trial time (-2.6% vs -0.6%, p = 0.002). VO2max improved modestly after HIIT (+2.6% vs +0.8%, p = 0.027). A carefully dosed HIIT substitution block improved linked determinants of endurance performance without increasing total weekly training time. The findings support HIIT as a targeted redistribution strategy in trained male runners rather than as an indiscriminate addition of hard training.
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