Strength symmetry and imprecise sense of effort in knee extension/Simetrija snage i neprecizan subjektivni osjecaj opterecenja pri ispruzanju potkoljenice

• Published in: Kinesiology (Zagreb, Croatia) Croatia), 2010-07, Vol.42 (2), p.164
• Main Authors: Wiest, Matheus J, Dagnese, Frederico, Carpes, Felipe P
• Format: Article
• Language: English
• Subjects: Knee; Muscle strength; Physiological aspects
• ISSN: 1331-1441

To verify the asymmetry in strength and the sense of effort between the preferred and non-preferred leg as well as differences between perceived and real workload achieved during trials for a maximal one-repetition knee extension, 32 subjects, all physically active (24 males and 8 females) performed one-repetition tests for knee extension (1 RM) with their preferred and non-preferred leg. The subjects reported the sense of effort by means of the Borg's scale for subjective perceived effort. Asymmetry was quantified for the workload and the sense of effort. We found similar strength and sense of effort for both legs. There were differences between the perceived and real workload when normalized by the maximal effort, mostly for higher intensities. Similar strength could be achieved between the preferred and non-preferred leg; however, the subjects' perception about the workload can be imprecise, which may lead to mistakes when controlling training overload by means of the sense of effort. Key words: functional laterality, knee force, sense of effort, one-repetition test, laterality. Istrazivanje je provedeno radi utvrdivanja postoji li asimetrija u snazi te razlika u subjektivnom osjecaju opterecenja izmedu preferirane i nepreferirane noge, kao i razlika izmedu dozivljenoga i stvarnoga opterecenja postignutoga tijekom testiranja maksimalne izvedbe ispruzanja potkoljenice. 32 fizicki aktivna ispitanika (24 muskarca i 8 zena) izvodila su test maksimalnog opterecenja (1 RM) tijekom ispruzanja potkoljenice preferirane i nepreferirane noge. Ispitanici su na Borgovoj skali za subjektivnu procjenu opterecenja ocijenili osjecaj opterecenja tijekom obje izvedbe. Asimetrija je kvantificirana za opterecenje te za osjecaj opterecenja. Istrazivanjem su dobiveni slicni rezultati za jakost i osjecaj opterecenja za obje noge. Nakon normalizacije maksimalnim opterecenjem, u istrazivanju su utvrdene razlike izmedu dozivljenoga i stvarnoga opterecenja, najvise za pokusaje pri visem intenzitetu. Slicna se jakost moze postici izmedu preferirane i nepreferirane noge, ali samopercepcija opterecenja ipak moze biti neprecizna, sto moze dovesti do pogresaka u kontroli trenaznoga opterecenja subjektivnim osjecajem opterecenja. Kljucne rijeci: funkcionalna lateralnost, sila u koljenom zglobu, subjektivni osjecaj opterecenja, test maksimalnog ponavljanja, lateralnost.