Effects of Sprint versus High-Intensity Aerobic Interval Training on Cross-Country Mountain Biking Performance: A Randomized Controlled Trial

The current study compared the effects of high-intensity aerobic training (HIT) and sprint interval training (SIT) on mountain biking (MTB) race simulation performance and physiological variables, including peak power output (PPO), lactate threshold (LT) and onset of blood lactate accumulation (OBLA...

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Bibliographic Details
Published in:PloS one 2016-01, Vol.11 (1), p.e0145298-e0145298
Main Authors: Inoue, Allan, Impellizzeri, Franco M, Pires, Flávio O, Pompeu, Fernando A M S, Deslandes, Andrea C, Santos, Tony M
Format: Article
Language:English
Subjects:
Adult
Aerobic exercises
Aerobics
All terrain cycling
Athletes
Athletic Performance - physiology
Bicycling
Bicycling - physiology
Body mass
Body measurements
Exercise - physiology
Exercise intensity
Group dynamics
Humanities
Humans
Laboratories
Lactic acid
Lactic Acid - blood
Mountain biking
Musculoskeletal system
Neurosciences
Oxygen consumption
Performance tests
Physical education
Physical fitness
Physical Fitness - physiology
Physiological aspects
Physiology
Race
Running - physiology
Simulation Training - methods
Studies
Training
Training analysis
Variance analysis
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Summary:The current study compared the effects of high-intensity aerobic training (HIT) and sprint interval training (SIT) on mountain biking (MTB) race simulation performance and physiological variables, including peak power output (PPO), lactate threshold (LT) and onset of blood lactate accumulation (OBLA). Sixteen mountain bikers (mean ± SD: age 32.1 ± 6.4 yr, body mass 69.2 ± 5.3 kg and VO2max 63.4 ± 4.5 mL∙kg(-1)∙min(-1)) completed graded exercise and MTB performance tests before and after six weeks of training. The HIT (7-10 x [4-6 min--highest sustainable intensity / 4-6 min-CR100 10-15]) and SIT (8-12 x [30 s--all-out intensity / 4 min--CR100 10-15]) protocols were included in the participants' regular training programs three times per week. Post-training analysis showed no significant differences between training modalities (HIT vs. SIT) in body mass, PPO, LT or OBLA (p = 0.30 to 0.94). The Cohen's d effect size (ES) showed trivial to small effects on group factor (p = 0.00 to 0.56). The interaction between MTB race time and training modality was almost significant (p = 0.08), with a smaller ES in HIT vs. SIT training (ES = -0.43). A time main effect (pre- vs. post-phases) was observed in MTB race performance and in several physiological variables (p = 0.001 to 0.046). Co-variance analysis revealed that the HIT (p = 0.043) group had significantly better MTB race performance measures than the SIT group. Furthermore, magnitude-based inferences showed HIT to be of likely greater benefit (83.5%) with a lower probability of harmful effects (0.8%) compared to SIT. The results of the current study suggest that six weeks of either HIT or SIT may be effective at increasing MTB race performance; however, HIT may be a preferable strategy. ClinicalTrials.gov NCT01944865.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0145298