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Titolo:
Force/velocity and power/velocity relationships in squat exercise
Autore:
Rahmani, A; Viale, F; Dalleau, G; Lacour, JR;
Indirizzi:
Fac Med, GIP Exercise, Exercise Physiol Lab, F-69921 Oullins, France Fac Med Oullins France F-69921 cise Physiol Lab, F-69921 Oullins, France Univ Reunion, Ctr Univ Rech Act Phys & Sport, Fac Sci & Technol, F-97430 Le Tampon, France Univ Reunion Le Tampon France F-97430 Technol, F-97430 Le Tampon, France
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 3, volume: 84, anno: 2001,
pagine: 227 - 232
SICI:
1439-6319(200103)84:3<227:FAPRIS>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FORCE-VELOCITY RELATIONSHIP; MAXIMAL POWER; MUSCULAR FUNCTION; ISOMETRIC TESTS; VERTICAL JUMP; MUSCLE; SPECIFICITY; STRENGTH; CONTRACTION; PERFORMANCE;
Keywords:
dynamic; isometric; force/velocity relationship; extrapolated isometric force; power/velocity relationship;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Rahmani, A Fac Med, GIP Exercise, Exercise Physiol Lab, BP 12, F-69921 Oullins, France Fac Med BP 12 Oullins France F-69921 , F-69921 Oullins, France
Citazione:
A. Rahmani et al., "Force/velocity and power/velocity relationships in squat exercise", EUR J A PHY, 84(3), 2001, pp. 227-232

Abstract

The purpose of this study was to describe the force/velocity and power/velocity relationships obtained during squat exercise. The maximal force (F-0)was extrapolated from the force/velocity relationship and compared to the isometric force directly measured with the aid of a force platform placed under the subject's feet. Fifteen international downhill skiers [mean (SD) age 22.4 (2.6) years, height 178 (6.34) cm and body mass 81.3 (7.70) kg] performed maximal dynamic and isometric squat exercises on a guided barbell. The dynamic squats were performed with masses ranging from 60 to 180 kg, which were placed on the shoulders. The force produced during the squat exercise was linearly related to the velocity in each subject (r(2) = 0.83-0.98, P < 0.05-0.0001). The extrapolated F-0 was 23% higher than the measured isometric force (P < 0.001), and the two measurements were not correlated. This may be attributed to the position of the subject, since the isometric force was obtained at a constant angle (90 degrees of knee flexion), whereas the dynamic forces were measured through a range of movements (from 90 degrees to 180 degrees). The power/velocity relationship was parabolic in shape for each subject (r(2) = 0.94-0.99), P < 0.01-0.0001). However, the curve obtained exhibited only an ascending part. The highest power was produced against the lightest load (i.e., 60 kg). The maximal power (W-max) and optimal velocity were never reached. The failure to observe the descending part of the power/velocity curve may be attributed to the upper limitation of thevelocities studied. Nevertheless, the extrapolation of W-max from the power/velocity equation showed that it would be reached for a load close to body mass, or even under unloaded conditions.

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Documento generato il 26/09/20 alle ore 11:49:13