Sandro R Freitas1,2, Ricardo J Andrade3,4, Antoine Nordez4, Bruno Mendes5, Pedro Mil-Homens3. 1. Faculdade de Motricidade Humana, Universidade de Lisboa, CIPER, P-1100, Lisbon, Portugal. sfreitas@fmh.ulisboa.pt. 2. Benfica LAB, Sport Lisboa e Benfica, Lisbon, Portugal. sfreitas@fmh.ulisboa.pt. 3. Faculdade de Motricidade Humana, Universidade de Lisboa, CIPER, P-1100, Lisbon, Portugal. 4. Laboratory "Movement, Interactions, Performance" (EA 4334), University of Nantes, UFR STAPS, Nantes, France. 5. Benfica LAB, Sport Lisboa e Benfica, Lisbon, Portugal.
Abstract
PURPOSE: A previous study observed a joint passive torque increase above baseline ~30 min after a high-intensity stretching. This study examined the effect of a high-intensity stretching on ankle dorsiflexion passive torque, medial gastrocnemius (MG) shear modulus, and plantar flexorsmaximal voluntary isometric force (MVIC). METHOD: Participants (n = 11, age 27.2 ± 6.5 years, height 172.0 ± 10.0 cm, weight 69.5 ± 10.4 kg) underwent two stretching sessions with plantar flexors isometric contractions performed: (1) 5 min before, 1 min after, and every 10 min after stretching (MVC session); (2) 5 min before, and 60 min after the stretching (no-MVC session). RESULTS: In both sessions, no changes were observed for MG shear modulus (p > 0.109). In the no-MVC session, passive torque decreased 1 min after stretching (-7.5 ± 8.4 %, p = 0.015), but increased above baseline 30 min after stretching (+6.3 ± 9.3 %, p = 0.049). In the MVC session, passive torque decreased at 1 min (-10.1 ± 6.3 %, p < 0.001), 10 min (-6.3 ± 8.2 %, p = 0.03), 20 min (-8.0 ± 9.2 %, p = 0.017), and 60 min (-9.2 ± 12.4 %, p = 0.034) after the stretching, whereas the MVIC decreased at 1 min (-5.0 ± 9.3 %, p = 0.04) and 10 min (-6.7 ± 8.7 %, p = 0.02) after stretching. CONCLUSION: The ankle passive torque increase 30 min following the stretch was not due to the MG shear modulus response; consequently, response may be due to changes in surrounding connective tissue mechanical properties.
RCT Entities:
PURPOSE: A previous study observed a joint passive torque increase above baseline ~30 min after a high-intensity stretching. This study examined the effect of a high-intensity stretching on ankle dorsiflexion passive torque, medial gastrocnemius (MG) shear modulus, and plantar flexors maximal voluntary isometric force (MVIC). METHOD:Participants (n = 11, age 27.2 ± 6.5 years, height 172.0 ± 10.0 cm, weight 69.5 ± 10.4 kg) underwent two stretching sessions with plantar flexors isometric contractions performed: (1) 5 min before, 1 min after, and every 10 min after stretching (MVC session); (2) 5 min before, and 60 min after the stretching (no-MVC session). RESULTS: In both sessions, no changes were observed for MG shear modulus (p > 0.109). In the no-MVC session, passive torque decreased 1 min after stretching (-7.5 ± 8.4 %, p = 0.015), but increased above baseline 30 min after stretching (+6.3 ± 9.3 %, p = 0.049). In the MVC session, passive torque decreased at 1 min (-10.1 ± 6.3 %, p < 0.001), 10 min (-6.3 ± 8.2 %, p = 0.03), 20 min (-8.0 ± 9.2 %, p = 0.017), and 60 min (-9.2 ± 12.4 %, p = 0.034) after the stretching, whereas the MVIC decreased at 1 min (-5.0 ± 9.3 %, p = 0.04) and 10 min (-6.7 ± 8.7 %, p = 0.02) after stretching. CONCLUSION: The ankle passive torque increase 30 min following the stretch was not due to the MG shear modulus response; consequently, response may be due to changes in surrounding connective tissue mechanical properties.
Authors: Sandro R Freitas; João R Vaz; Luis Gomes; Rui Silvestre; Edgar Hilário; Nuno Cordeiro; Filomena Carnide; Pedro Pezarat-Correia; Pedro Mil-Homens Journal: J Strength Cond Res Date: 2015-09 Impact factor: 3.775
Authors: Sandro R Freitas; João R Vaz; Paula M Bruno; Maria João Valamatos; Ricardo J Andrade; Pedro Mil-Homens Journal: Int J Sports Physiol Perform Date: 2014-07-08 Impact factor: 4.010
Authors: L L Smith; M H Brunetz; T C Chenier; M R McCammon; J A Houmard; M E Franklin; R G Israel Journal: Res Q Exerc Sport Date: 1993-03 Impact factor: 2.500