Document Detail

Effects of intensity and duration in aerobic high-intensity interval training in highly-trained junior cross-country skiers.
MedLine Citation:
PMID:  23037620     Owner:  NLM     Status:  Publisher    
ABSTRACT: The purpose of this study was to test whether a long duration of aerobic high-intensity interval training is more effective than shorter intervals at a higher intensity in highly trained endurance athletes. The sample comprised of 12 male and 9 female, national level junior cross-country skiers (age: 17.5±0.4 yr, maximal oxygen uptake (VO2max): 67.4±7.7 mL min kg), who performed 8-week baseline and 8-week intervention training periods on dry land. During the intervention period, a short-interval group (n=7) added two weekly sessions with short duration intervals (2- to 4-min bouts, total duration of 15-20 min), a long-interval group (n=7) added two weekly sessions with long duration intervals (5- to 10-min bouts, total duration of 40-45 min). The interval sessions were performed with the athletes' maximal sustainable intensity. A control group (n=7) added two weekly sessions with low-intensity endurance training at 65-74% of maximal heart rate. Before and after the intervention period, the skiers were tested for time-trial performance on 12 km roller-ski skating and 7 km hill run. VO2max and oxygen uptake at the ventilatory threshold (VO2VT) were measured during treadmill running. After the intervention training period, the long-interval group improved 12 km roller-ski, 7 km hill run, VO2max and VO2VT by 6.8±4.0%, 4.8±2.6%, 3.7±1.6% and 5.8±3.3%, respectively, from pre to post-testing, and improved both performance tests and VO2VT when compared to the short-interval group and the control group (all p<0.05). The short-interval group improved VO2max by 3.5±3.2% from pre to post-testing (p<0.05), whereas the control group remained unchanged. As hypothesized, a long duration of aerobic high-intensity interval training improved endurance performance and oxygen uptake at the ventilatory threshold more than shorter intervals at a higher intensity.
Oyvind Sandbakk; Silvana Bucher Sandbakk; Gertjan Ettema; Boye Welde
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-3
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Department of Human Movement Science, Norwegian University of Science and Technology, Trondheim, Norway 2 Nord-Trøndelag University College, Department of Sport and Physical Education, Levanger, Norway.
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