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Physiological responses during intermittent running exercise differ between outdoor and treadmill running
- Panascì, Marco, Lepers, Romuald, La Torre, Antonio, Bonato, Matteo, Assadi, Hervè
- Applied physiology, nutrition and metabolism 2017 v.42 no.9 pp. 973-977
- exercise, males, oxygen, oxygen consumption, physiological response
- The aim of this study was to compare the physiological responses during 15 min of intermittent running consisting of 30 s of high-intensity running exercise at maximal aerobic velocity (MAV) interspersed with 30 s of passive recovery (30–30) performed outdoor versus on a motorized treadmill. Fifteen collegiate physically active males (age, 22 ± 1 years old; body mass, 66 ± 7 kg; stature, 176 ± 06 cm; weekly training volume, 5 ± 2 h·week⁻¹), performed the Fitness Intermittent Test 45–15 to determine maximal oxygen uptake (V̇O₂ₘₐₓ) and MAV and then completed in random order 3 different training sessions consisting of a 30-s run/30-s rest on an outdoor athletic track (30–30 Track) at MAV; a 30-s run/30-s rest on a treadmill (30–30 Treadmill) at MAV; a 30-s run/30-s rest at MAV+15% (30–30 + 15% MAV Treadmill). Oxygen uptake (V̇O₂), time above 90%V̇O₂ₘₐₓ (t90%V̇O₂ₘₐₓ), and rating of perceived exertion (RPE) were measured during each training session. We observed a statistical significant underestimation of V̇O₂ (53.1 ± 5.4 mL·kg⁻¹·min⁻¹ vs 49.8 ± 6.7 mL·kg⁻¹·min⁻¹, –6.3%, P = 0.012), t90%V̇O₂ₘₐₓ (8.6% ± 11.5% vs 38.7% ± 32.5%, –77.8%, P = 0.008), RPE (11.4 ± 1.4 vs 16.5 ± 1.7, –31%, P < 0.0001) during the 30–30 Treadmill compared with the same training session performed on track. No statistical differences between 30–30 +15 % MAV Treadmill and 30–30 Track were observed. The present study demonstrates that a 15% increase in running velocity during a high-intensity intermittent treadmill training session is the optimal solution to reach the same physiological responses than an outdoor training session.