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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 1999 Dicembre;39(4):294-9

 ORIGINAL ARTICLES

The ­effects of ­rest ­interval on quad­ri­ceps ­torque and per­ceived exer­tion in ­healthy ­males

Pin­ci­vero D. M. 1, Gear W. S. 2, Moyna N. M. 3, Rob­ertson R. J. 4

1 Depart­ment of Phys­ical ­Therapy, Eastern Wash­ington Uni­ver­sity, ­Cheney, WA;
2 Depart­ment of Phys­ical Edu­ca­tion, Rec­re­a­tion, and ­Dance Cal­i­fornia ­State Uni­ver­sity, Domin­guez ­Hills;
3 Nuclear Car­di­ology, Hart­ford Hos­pital;
4 Human ­Energy ­Research Labor­a­tory, Uni­ver­sity of Pitts­burgh, PA

Back­ground. The ­ability to gen­erate max­imal mus­cular ­force is depen­dant ­upon ­time medi­ated mech­a­nisms of ­fatigue. ­Inter-set ­rest ­interval ­length may not ­only ­affect ­force pro­duc­tion but may ­also man­i­fest ­changes in rat­ings of per­ceived exer­tion (RPE). The pur­pose of ­this ­study was to ­examine the ­effects of ­rest ­interval on quad­ri­ceps ­torque and RPE ­during mul­tiple ­sets of ­resisted ­knee exten­sions.
­Methods. 14 ­healthy ­male vol­un­teers ­were ­assessed for con­cen­tric iso­ki­netic quad­ri­ceps ­peak ­torque, ­total ­work, and ­average ­power on the ­Biodex ­System II Iso­ki­netic Dyna­mom­eter at a preset ­angular ­velocity of 180 deg·sec-1. Per­ceived exer­tion was meas­ured ­with a mod­i­fied cat­e­gory-­ratio ­scale (CR-10). ­Under iso­metric con­di­tions the per­cep­tual ­range was ­anchored ­with one ­high and two low ­anchors. Sub­jects ­were ran­domly ­assigned to one of two ­groups: ­short ­rest ­interval (­Group 1, 40 sec) and ­long ­rest ­interval (­Group 2, 160 sec). All sub­jects per­formed 4 ­sets of 20 max­imal iso­ki­netic con­trac­tions ­with an ­inter-set ­rest ­interval ­that cor­re­sponded to ­their ­group assign­ment. Fol­lowing the com­ple­tion of ­each set sub­jects ­were ­asked to ­assign a ­rating out of 10 to the feel­ings in ­their quad­ri­ceps by vis­u­ally ­observing a ­chart of the CR-10 ­scale.
­Results. The ­results dem­on­strated a sig­nif­i­cantly ­greater ­decline in quad­ri­ceps ­peak ­torque (p<0.05), ­total ­work (p<0.05), and ­average ­power (p<0.05) by ­Group 1 as com­pared to ­Group 2. ­Changes in RPE ­across the 4 ­sets of exer­cise did not ­show a sig­nif­i­cant dif­fer­ence ­between the 2 ­groups.
Con­clu­sions. The gen­er­a­tion of quad­ri­ceps ­torque is a func­tion of ­rest ­interval ­length, ­whereas per­ceived exer­tion ­appears to be unaf­fected.

lingua: Inglese


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