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Table 3 Presentation of changes in endurance performance variables

From: The Salzburg 10/7 HIIT shock cycle study: the effects of a 7-day high-intensity interval training shock microcycle with or without additional low-intensity training on endurance performance, well-being, stress and recovery in endurance trained athletes—study protocol of a randomized controlled trial

Endurance variable Pre Post
T1 T4 T5 T6
Incremental test     
 LT (km/h) 11.9 12.1 (+ 1.7%) 12.4 (+ 4.2%) 12.4 (+ 4.2%)
 HR at LT (bpm) 154 156 (+ 1.3%) 156 (+ 1.3%) 154 (+ 0.0%)
 VO2 at LT (ml/min/kg) 39.1 39.8 (+ 1.8%) 39.8 (+ 1.8%) 40.7 (+ 4.1%)
 VO2 at LT (%VO2max) 70.0 70.8 (+ 1.1%) 68.6 (− 2.0%) 70.4 (+ 0.6%)
Ramp test     
 VO2max (ml/min/kg) 55.8 56.3 (+ 0.9%) 57.5 (+ 3.0%) 57.8 (+ 3.6%)
 HRmax (bpm) 191 188 (− 1.6%) 189 (− 1.0%) 190 (− 0.5%)
 Lapeak (mmol/L) 10.1 11.1 (+ 9.9%) 11.2 (+ 10.9%) 12.6 (+ 24.8%)
 PPO (W) 470 489 (+ 4.0%) 496 (+ 5.5%) 503 (+ 7.0%)
 TTE (min:s) 7:25 8:05 (+ 9%) 8:20 (+ 12.4%) 8:35 (+ 15.7%)
Time trial     
 5 km (min:s) 21:29   20:50 (− 3.0%)
 HR mean (bpm) 181   180 (− 0.6%)
 MPO (W) 349   368 (+ 5.4%)
  1. VO2max = maximal oxygen uptake, HRmax = maximal heart rate, Lapeak = peak blood lactate, PPO = peak power output determined via Stryd, TTE = Time to exhaustion, LT = lactate threshold according to the modified version based on Thoden, 1991, HR at LT = heart rate at lactate threshold, VO2 at LT(ml/min/kg) = oxygen uptake at lactate threshold, VO2 at LT (%VO2max) = fractional utilization of VO2max at lactate threshold, 5 km time trial = self-directed in outdoor environment, HR mean = mean heart rate, MPO = mean power output determined via Stryd