NDLI: The effects of short-cycle sprints on power, strength, and salivary hormones in elite rugby players.

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The effects of short-cycle sprints on power, strength, and salivary hormones in elite rugby players.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Crewther, Blair T. Cook, Christian J. Lowe, Tim E. Weatherby, Robert P. Gill, Nicholas
Description	Country affiliation: New Zealand Author Affiliation: Crewther BT ( Health and Food Group, The Horticulture and Food Research Institute of New Zealand, Hamilton, New Zealand. blair@optimalsports.co.nz)
Abstract	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.
File Format	HTM / HTML
ISSN	10648011
Issue Number	1
Volume Number	25
e-ISSN	15334287
Journal	Journal of Strength and Conditioning Research
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2011-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Sport Sciences Athletic Performance Physiology Exercise Football Muscle Strength Saliva Chemistry Adult Athletes Cross-over Studies Humans Hydrocortisone Male Muscle, Skeletal Testosterone Weight Lifting Young Adult Journal Article Randomized Controlled Trial Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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