Kristian Thorborg1,2, Thomas Bandholm3,4, Mette Zebis5, Lars Louis Andersen6, Jesper Jensen7, Per Hölmich7. 1. Sports Orthopedic Research Center Copenhagen (SORC-C), Arthroscopic Centre Amager, Copenhagen University Hospital, Hvidovre, Italiensvej 1, 2300, Copenhagen S, Denmark. kristianthorborg@hotmail.com. 2. Physical Medicine and Rehabilitation Research - Copenhagen (PMR-C), and Departments of Orthopaedic Surgery and Physical Therapy, Copenhagen University Hospital, Copenhagen, Denmark. kristianthorborg@hotmail.com. 3. Physical Medicine and Rehabilitation Research - Copenhagen (PMR-C), and Departments of Orthopaedic Surgery and Physical Therapy, Copenhagen University Hospital, Copenhagen, Denmark. 4. Clinical Research Centre, Copenhagen University Hospital, Hvidovre, Copenhagen, Denmark. 5. Gait Analysis Laboratory, Copenhagen University Hospital, Copenhagen, Denmark. 6. National Research Centre for the Working Environment, Copenhagen, Denmark. 7. Sports Orthopedic Research Center Copenhagen (SORC-C), Arthroscopic Centre Amager, Copenhagen University Hospital, Hvidovre, Italiensvej 1, 2300, Copenhagen S, Denmark.
Abstract
PURPOSE: To investigate the effect on hip-flexion strength of a 6-week hip-flexor training programme using elastic bands as resistance. We hypothesized that the training group, compared to a control group, would increase their hip-flexion strength more. METHODS:Thirty-three healthy subjects (45 % females), 24(5) years of age, were included in a randomized controlled trial and allocated to heavy strength training of the hip-flexor muscles or to control (no strength training). Strength training of the hip-flexors (dominant leg) was performed three times 10 min per week for 6 weeks. The strength training group progressed from 15 repetition maximum (RM) (week 1) to 8 RM (week 6). Isometric hip-flexion strength (primary outcome) was measured by a blinded assessor using a reliable test procedure. RESULTS: In the strength training group, the isometric hip-flexion strength of the trained leg increased by 17 %, (p < 0.001). The between-group difference in hip-flexion strength change in the trained leg (dominant leg, training group) versus the non-trained leg (dominant leg, control group) was significantly different from baseline to follow-up, corresponding to a mean change of 0.34 (95 % CI 0.17-0.52) Nm/kg, in favour of the strength training group (p < 0.001). CONCLUSION: Simple hip-flexor strength training using elastic bands as external loading, for only 6 weeks, substantially improves hip-flexor muscle strength. This simple exercise programme seems promising for future prevention and treatment of acute and longstanding hip-flexor injuries, such as acute rectus femoris injuries and longstanding iliopsoas-related pain and impingement. LEVEL OF EVIDENCE: I.
RCT Entities:
PURPOSE: To investigate the effect on hip-flexion strength of a 6-week hip-flexor training programme using elastic bands as resistance. We hypothesized that the training group, compared to a control group, would increase their hip-flexion strength more. METHODS: Thirty-three healthy subjects (45 % females), 24(5) years of age, were included in a randomized controlled trial and allocated to heavy strength training of the hip-flexor muscles or to control (no strength training). Strength training of the hip-flexors (dominant leg) was performed three times 10 min per week for 6 weeks. The strength training group progressed from 15 repetition maximum (RM) (week 1) to 8 RM (week 6). Isometric hip-flexion strength (primary outcome) was measured by a blinded assessor using a reliable test procedure. RESULTS: In the strength training group, the isometric hip-flexion strength of the trained leg increased by 17 %, (p < 0.001). The between-group difference in hip-flexion strength change in the trained leg (dominant leg, training group) versus the non-trained leg (dominant leg, control group) was significantly different from baseline to follow-up, corresponding to a mean change of 0.34 (95 % CI 0.17-0.52) Nm/kg, in favour of the strength training group (p < 0.001). CONCLUSION: Simple hip-flexor strength training using elastic bands as external loading, for only 6 weeks, substantially improves hip-flexor muscle strength. This simple exercise programme seems promising for future prevention and treatment of acute and longstanding hip-flexor injuries, such as acute rectus femoris injuries and longstanding iliopsoas-related pain and impingement. LEVEL OF EVIDENCE: I.
Authors: K Thorborg; T Bandholm; J Petersen; K M Ø Weeke; C Weinold; B Andersen; A Serner; S P Magnusson; P Hölmich Journal: Scand J Med Sci Sports Date: 2010-10 Impact factor: 4.221
Authors: Diego A Bonilla; Luis A Cardozo; Jorge M Vélez-Gutiérrez; Adrián Arévalo-Rodríguez; Salvador Vargas-Molina; Jeffrey R Stout; Richard B Kreider; Jorge L Petro Journal: Int J Environ Res Public Health Date: 2022-10-05 Impact factor: 4.614
Authors: Andreas Serner; Adam Weir; Johannes L Tol; Kristian Thorborg; Sean Lanzinger; Roald Otten; Per Hölmich Journal: Orthop J Sports Med Date: 2020-01-29