| Effects of short-term training using powercranks on cardiovascular fitness and cycling efficiency. | |
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MedLine Citation:
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PMID: 14666944 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Powercranks use a specially designed clutch to promote independent pedal work by each leg during cycling. We examined the effects of 6 wk of training on cyclists using Powercranks (n=6) or normal cranks (n=6) on maximal oxygen consumption (VO2max) and anaerobic threshold (AT) during a graded exercise test (GXT), and heart rate (HR), oxygen consumption (VO2), respiratory exchange ration (RER), and gross efficiency (GE) during a 1-hour submaximal ride at a constant load. Subjects trained at 70% of VO2max for 1 h.d(-1), 3 d.wk(-1), for 6 weeks. The GXT and 1-hour submaximal ride were performed using normal cranks pretraining and posttraining. The 1-hour submaximal ride was performed at an intensity equal to approximately 69% of pretraining VO2max with VO2, RER, GE, and HR determined at 15-minute intervals during the ride. No differences were observed between or within groups for VO2max or AT during the GXT. The Powercranks group had significantly higher GE values than the normal cranks group (23.6 +/- 1.3% versus 21.3 +/- 1.7%, and 23.9 +/- 1.4% versus 21.0 +/- 1.9% at 45 and 60 min, respectively), and significantly lower HR at 30, 45, and 60 minutes and VO2 at 45 and 60 minutes during the 1-hour submaximal ride posttraining. It appears that 6 weeks of training with Powercranks induced physiological adaptations that reduced energy expenditure during a 1-hour submaximal ride. |
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Authors:
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Mark D Luttrell; Jeffrey A Potteiger |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 17 ISSN: 1064-8011 ISO Abbreviation: J Strength Cond Res Publication Date: 2003 Nov |
Date Detail:
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Created Date: 2003-12-10 Completed Date: 2004-03-19 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
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Languages: eng Pagination: 785-91 Citation Subset: IM |
Affiliation:
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Department of Health, Sport and Exercise Science, University of Kansas, Lawrence 66045, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Bicycling / physiology* Cardiovascular Physiological Phenomena* Exercise Test Female Humans Male Physical Education and Training / methods* Physical Endurance Physical Fitness / physiology* |
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