BACKGROUND: A method of measurement of voluntary activation (VA, percent of full muscle recruitment) during isometric and isokinetic concentric contractions of the quadriceps femoris (QF) at 60s and 120s was previously validated. OBJECTIVE: This study aimed to quantify the test-retest minimal real difference (MRD) of VA during isometric (ISOM) and isokinetic concentric contractions of QF (100s, ISOK) in a sample of healthy individuals. METHODS: VA was measured through the interpolated twitch technique. Pairs of electrical stimuli were delivered to the QF at 40 of knee flexion during maximal voluntary contractions. Twenty-five healthy participants (20-38 years, 12 women, 13 men) completed two testing sessions with a 14-day interval. VA values were linearized through logit transformation (VAl). The MRD was estimated from intraclass correlation coefficients (model 2.1). RESULTS: The VA (median, range) was 84.20% (38.2-99.9%) in ISOM and 94.22% (33.8-100%) in ISOK. MRD was 0.78 and 1.12 logit for ISOM and ISOK, respectively. As an example, in terms of percent VA these values correspond to a change from 76% to 95% and from 79% to 98% in ISOM and in ISOK, respectively. CONCLUSIONS: The provided MRD values allow to detect significant individual changes in VA, as expected after training and rehabilitation programs.

Catino, L., Malloggi, C., Scarano, S., Cerina, V., Rota, V., Tesio, L. (2021). Quadriceps activation during maximal isometric and isokinetic contractions: The minimal real difference and its implications. ISOKINETICS AND EXERCISE SCIENCE, 29(3), 277-289 [10.3233/IES-203241].

Quadriceps activation during maximal isometric and isokinetic contractions: The minimal real difference and its implications

Cerina V.;
2021

Abstract

BACKGROUND: A method of measurement of voluntary activation (VA, percent of full muscle recruitment) during isometric and isokinetic concentric contractions of the quadriceps femoris (QF) at 60s and 120s was previously validated. OBJECTIVE: This study aimed to quantify the test-retest minimal real difference (MRD) of VA during isometric (ISOM) and isokinetic concentric contractions of QF (100s, ISOK) in a sample of healthy individuals. METHODS: VA was measured through the interpolated twitch technique. Pairs of electrical stimuli were delivered to the QF at 40 of knee flexion during maximal voluntary contractions. Twenty-five healthy participants (20-38 years, 12 women, 13 men) completed two testing sessions with a 14-day interval. VA values were linearized through logit transformation (VAl). The MRD was estimated from intraclass correlation coefficients (model 2.1). RESULTS: The VA (median, range) was 84.20% (38.2-99.9%) in ISOM and 94.22% (33.8-100%) in ISOK. MRD was 0.78 and 1.12 logit for ISOM and ISOK, respectively. As an example, in terms of percent VA these values correspond to a change from 76% to 95% and from 79% to 98% in ISOM and in ISOK, respectively. CONCLUSIONS: The provided MRD values allow to detect significant individual changes in VA, as expected after training and rehabilitation programs.
Articolo in rivista - Articolo scientifico
isokinetic; minimal real difference; quadriceps; rehabilitation; Voluntary activation;
English
2021
29
3
277
289
none
Catino, L., Malloggi, C., Scarano, S., Cerina, V., Rota, V., Tesio, L. (2021). Quadriceps activation during maximal isometric and isokinetic contractions: The minimal real difference and its implications. ISOKINETICS AND EXERCISE SCIENCE, 29(3), 277-289 [10.3233/IES-203241].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/469225
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