| The effects of short-cycle sprints on power, strength, and salivary hormones in elite rugby players. | |
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MedLine Citation:
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PMID: 20093968 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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This study examined the effects of short-cycle sprints on power, strength, and salivary hormones in elite rugby players. Thirty male rugby players performed an upper-body power and lower-body strength (UPLS) and/or a lower-body power and upper-body strength (LPUS) workout using a crossover design (sprint vs. control). A 40-second upper-body or lower-body cycle sprint was performed before the UPLS and LPUS workouts, respectively, with the control sessions performed without the sprints. Bench throw (BT) power and box squat (BS) 1 repetition maximum (1RM) strength were assessed in the UPLS workout, and squat jump (SJ) power and bench press (BP) 1RM strength were assessed in the LPUS workout. Saliva was collected across each workout and assayed for testosterone (Sal-T) and cortisol (Sal-C). The cycle sprints improved BS (2.6 ± 1.2%) and BP (2.8 ± 1.0%) 1RM but did not affect BT and SJ power. The lower-body cycle sprint produced a favorable environment for the BS by elevating Sal-T concentrations. The upper-body cycle sprint had no hormonal effect, but the workout differences (%) in Sal-T (r = -0.59) and Sal-C (r = 0.42) concentrations correlated to the BP, along with the Sal-T/C ratio (r = -0.49 to -0.66). In conclusion, the cycle sprints improved the BP and BS 1RM strength of elite rugby players but not power output in the current format. The improvements noted may be explained, in part, by the changes in absolute or relative hormone concentrations. These findings have practical implications for prescribing warm-up and training exercises. |
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Authors:
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Blair T Crewther; Christian J Cook; Tim E Lowe; Robert P Weatherby; Nicholas Gill |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 25 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-12-24 Completed Date: - Revised Date: - |
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: 32-9 Citation Subset: IM |
Affiliation:
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Health and Food Group, The Horticulture and Food Research Institute of New Zealand, Hamilton, New Zealand. blair@optimalsports.co.nz |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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