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- Title
Time to Exhaustion at Continuous and Intermittent Maximal Lactate Steady State During Running Exercise.
- Authors
Dittrich, Naiandra; de Lucas, Ricardo Dantas; Beneke, Ralph; Antonacci Guglielmo, Luiz Guilherme
- Abstract
The purpose of this study was to determine and compare the time to exhaustion (TE) and the physiological responses at continuous and intermittent (ratio 5:1) maximal lactate steady state (MLSS) in well-trained runners. Ten athletes (32.7 ± 6.9 y, VO2max 61.7 ± 3.9 mL • kg-1 • min-1) performed an incremental treadmill test, three to five 30-min constant-speed tests to determine the MLSS continuous and intermittent (5 min of running, interspaced by 1 min of passive rest), and 2 randomized TE tests at such intensities. Two-way ANOVA with repeated measures was used to compare the changes in physiological variables during the TE tests and between continuous and intermittent exercise. The intermittent MLSS velocity (MLSSint = 15.26 ± 0.97 km/h) was higher than in the continuous model (MLSScon = 14.53 ± 0.93 km/h), while the TE at MLSScon was longer than MLSSint, (68 ± 11 min and 58 ± 15 min, P < .05). Regarding the cardiorespiratory responses, VO2 and respiratory-exchange ratio remained stable during both TE tests while heart rate, ventilation, and rating of perceived exertion presented a significant increase in the last portion of the tests. The results showed a higher tolerance to exercising during MLSScon than during MLSSint in trained runners. Thus, the training volume of an extensive interval session (ratio 5:1) designed at MLSS intensity should take into consideration this higher speed at MLSS and also the lower TE than with continuous exercise.
- Subjects
ANALYSIS of variance; BODY weight; CARDIOPULMONARY system; COMPARATIVE studies; ENDURANCE sports; EXERCISE; EXERCISE tests; LACTATES; PROBABILITY theory; PULMONARY gas exchange; RUNNING; SKINFOLD thickness; STATURE; REPEATED measures design; OXYGEN consumption; DATA analysis software; EXERCISE tolerance
- Publication
International Journal of Sports Physiology & Performance, 2014, Vol 9, Issue 5, p772
- ISSN
1555-0265
- Publication type
Article
- DOI
10.1123/IJSPP.2013-0403