Journal article
Poststretch Isometric Contractions of the Hamstrings: Just a Brief Stretch to Achieve Supramaximal Isometric Force
Journal of Applied Biomechanics, Vol.37(4), pp.320-326
2021
Abstract
Hamstring strain injuries are common in sport. Supramaximal eccentric or high-intensity isometric contractions are favored in hamstring strain injury prevention. The effect of combining these contraction modes in such prevention programs as a poststretch isometric contraction is unknown. Poststretch isometric contractions incorporate an active stretch and result in greater final isometric force than isometric contractions at comparable joint angles. This study compared torque and muscle activation levels between maximal voluntary isometric contraction and maximal poststretch isometric contractions of the knee flexors. Participants (n = 9) completed baseline maximal voluntary isometric contraction at 150° knee flexion and maximal poststretch isometric contractions at 120° knee flexion actively stretching at 60°/s to 150° knee flexion for final isometric contraction. Torque of the knee flexors and surface electromyography root mean square (sEMG RMS) of biceps femoris long head were simultaneously recorded and compared between baseline and poststretch isometric at 150° knee flexion. Torque was 14% greater in the poststretch isometric condition compared with baseline maximal voluntary isometric contraction (42.45 [20.75] N·m, 14% [22.18%], P < .001) without increase in sEMG RMS of biceps femoris long head (−.03 mV, ±.06, P = .130, d = .93). Poststretch isometric contractions resulted in supramaximal levels of poststretch isometric torque without increased activation of biceps femoris long head.
Details
- Title
- Poststretch Isometric Contractions of the Hamstrings: Just a Brief Stretch to Achieve Supramaximal Isometric Force
- Authors
- Neil Chapman (Author) - Southern Cross UniversityJohn William Whitting (Author) - Southern Cross UniversitySuzanne Broadbent (Author) - University of the Sunshine Coast, Queensland, School of Health and Behavioural Sciences - LegacyZachary Crowley-McHattan (Author) - Southern Cross UniversityRudi Meir (Author) - Southern Cross University
- Publication details
- Journal of Applied Biomechanics, Vol.37(4), pp.320-326
- Publisher
- Human Kinetics, Inc.
- Date published
- 2021
- DOI
- 10.1123/jab.2020-0236
- ISSN
- 1543-2688
- Organisation Unit
- School of Health and Behavioural Sciences - Legacy; University of the Sunshine Coast, Queensland; School of Health - Sports & Exercise Science; Cancer Research Cluster
- Language
- English
- Record Identifier
- 99565608802621
- Output Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Web Of Science research areas
- Engineering, Biomedical
- Sport Sciences
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Source: InCites