Acute muscle and joint mechanical responses following a high-intensity stretching protocol

作者：Freitas Sandro R; Andrade Ricardo J; Nordez Antoine; Mendes Bruno; Mil Homens Pedro

来源：European Journal of Applied Physiology, 2016, 116(8): 1519-1526.

DOI：10.1007/s00421-016-3410-2

• Elastography
• Medial gastrocnemius
• Ankle
• Torque
• Flexibility
• Intensity

A previous study observed a joint passive torque increase above baseline similar to 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).
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).
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.
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.

• 出版日期2016-8