| Perceived exertion, electromyography, and blood lactate during acute bouts of resistance exercise. | |
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MedLine Citation:
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PMID: 11880823 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: This study examined ratings of perceived exertion (RPE) during resistance exercise in women. In addition, changes in blood lactic acid and biceps muscle activity assessed using electromyography (EMG) were investigated as potential mediators of RPE during resistance exercise. METHODS: Twenty female volunteers (age, 25 +/- 4 yr) performed one set of biceps curl exercise at 30%, 60%, and 90% of their one-repetition maximum (1-RM). Total work was held constant by varying the number of repetitions during each of the three intensities. The three intensities were performed in random order. RPE responses were assessed for both the active muscle (RPE-AM) and the overall body (RPE-O) following each intensity. EMG data were collected from the biceps brachii muscle during each intensity. Blood samples were taken before and following the intensities and analyzed for blood lactic acid concentration. RESULTS: A two-factor repeated-measures ANOVA showed a significant RPE (region) x intensity interaction (P < 0.02). Both RPE-AM and RPE-O increased as the intensity of exercise increased. EMG activity increased significantly (P < 0.01) as the intensity of exercise increased. A two-factor repeated measures ANOVA performed on the blood lactate data showed a significant (P < 0.04) time x intensity interaction. Postexercise [Hla] was significantly greater (P < 0.01) at 90% 1-RM than at 30% 1-RM. No significant differences were found in [Hla] between 30% and 60% 1-RM, or between 60% and 90% 1-RM. CONCLUSION: These results indicate that monitoring RPE may be a useful technique for regulating resistance exercise intensity. Moreover, blood lactate and activity of the involved muscle may mediate the relation between RPE and resistance exercise intensity. |
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Authors:
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Kristen M Lagally; Robert J Robertson; Kara I Gallagher; Fredric L Goss; John M Jakicic; Scott M Lephart; Steven T McCaw; Bret Goodpaster |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 34 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2002 Mar |
Date Detail:
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Created Date: 2002-03-06 Completed Date: 2002-04-16 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 552-9; discussion 560 Citation Subset: IM; S |
Affiliation:
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Illinois State University, Normal, IL 61790-5120, USA. kmlagal@ilstu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cross-Sectional Studies Electromyography Exercise / physiology* Female Humans Lactates / blood* Lifting Male Range of Motion, Articular Weight Lifting / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Lactates |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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