Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects
Objective: The aim of this study was to examine the effect of eccentric isotonic training on hamstring flexibility and eccentric and concentric isokinetic peak torque in trained and untrained subjects. Methods: Sixty healthy subjects (mean age: 21.66 ± 2.64) were divided into three equal groups, eac...
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| Format: | Article |
| Language: | English |
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AVES
2018-07-01
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| Series: | Acta Orthopaedica et Traumatologica Turcica |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1017995X17302110 |
| _version_ | 1797915466590584832 |
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| author | Amr Almaz Abdel-aziem Elsadat Saad Soliman Osama Ragaa Abdelraouf |
| author_facet | Amr Almaz Abdel-aziem Elsadat Saad Soliman Osama Ragaa Abdelraouf |
| author_sort | Amr Almaz Abdel-aziem |
| collection | DOAJ |
| description | Objective: The aim of this study was to examine the effect of eccentric isotonic training on hamstring flexibility and eccentric and concentric isokinetic peak torque in trained and untrained subjects. Methods: Sixty healthy subjects (mean age: 21.66 ± 2.64) were divided into three equal groups, each with 20 voluntary participants. Two experimental groups (untrained and trained groups) participated in a hamstring eccentric isotonic strengthening program (five days/week) for a six-week period and one control group that was not involved in the training program. The passive knee extension range of motion and hamstring eccentric and concentric isokinetic peak torque were measured at angular velocities 60° and 120°/s for all groups before and after the training period. Results: Two-way analysis of variance showed that there was a significant increase in the hamstring flexibility of the untrained and trained groups (25.65 ± 6.32°, 26.55 ± 5.99°, respectively), (p < 0.05) without a significant increase in the control group (31.55 ± 5.84°), (p > 0.05). Moreover, there was a significant increase in eccentric isokinetic peak torque of both the untrained and trained groups (127.25 ± 22.60Nm, 139.65 ± 19.15Nm, 125.40 ± 21.61Nm, 130.90 ± 18.71Nm, respectively), (p < 0.05) without a significant increase in the control group (109.15 ± 20.89Nm, 105.70 ± 21.31Nm, respectively), (p > 0.05) at both angular velocities. On the other hand, there was no significant increase in the concentric isokinetic peak torque of the three groups (92.50 ± 20.50Nm, 79.05 ± 18.95Nm, 92.20 ± 21.96Nm, 79.85 ± 18.97Nm, 100.45 ± 25.78Nm, 83.40 ± 23.73Nm, respectively), (p > 0.05) at both angular velocities. The change scores in the hamstring flexibility (06.25 ± 1.86°) and eccentric peak torque of the untrained group (16.60 ± 4.81Nm, 17.45 ± 5.40Nm, respectively) were significantly higher (p < 0.05) than those of the trained group (03.40 ± 1.14°, 9.90 ± 5.14Nm, 9.80 ± 7.57Nm, respectively), and the control group (00.90 ± 2.10°, 0.60 ± 2.93Nm, 1.40 ± 3.53Nm, respectively), at both angular velocities. Meanwhile, the change scores of the concentric peak torques of the three groups (1.15 ± 1.50Nm, −0.15 ± 2.16Nm, 1.35 ± 1.63Nm, 0.20 ± 2.95Nm, 0.60 ± 2.28Nm, −0.30 ± 2.25Nm) were statistically insignificant (p > 0.05). Conclusion: After a six-week period of eccentric isotonic training, the hamstring eccentric peak torque and flexibility of trained and untrained groups improved without changes in the concentric peak torque. Moreover, the improvement of untrained subjects was higher than trained subjects. These findings may be helpful in designing the hamstring rehabilitation program. Keywords: Eccentric exercise, Extensibility, Hamstring, Muscle torque, Trained subjects |
| first_indexed | 2024-04-10T12:42:15Z |
| format | Article |
| id | doaj.art-d33b7d0021c1414e8bfa27bb77793ab0 |
| institution | Directory Open Access Journal |
| issn | 1017-995X |
| language | English |
| last_indexed | 2024-04-10T12:42:15Z |
| publishDate | 2018-07-01 |
| publisher | AVES |
| record_format | Article |
| series | Acta Orthopaedica et Traumatologica Turcica |
| spelling | doaj.art-d33b7d0021c1414e8bfa27bb77793ab02023-02-15T16:14:16ZengAVESActa Orthopaedica et Traumatologica Turcica1017-995X2018-07-01524308314Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjectsAmr Almaz Abdel-aziem0Elsadat Saad Soliman1Osama Ragaa Abdelraouf2Department of Biomechanics, Faculty of Physical Therapy, Cairo University, Giza, Egypt; Corresponding author. Department of Biomechanics, Faculty of Physical Therapy, Cairo University, 7 Ahmed Elziat Street, Ben Elsaryat, El Dokki, 12611, Giza, Egypt.Department for Musculoskeletal Disorders and Its Surgery, Faculty of Physical Therapy, Cairo University, Giza, EgyptDepartment of Biomechanics, Faculty of Physical Therapy, Cairo University, Giza, EgyptObjective: The aim of this study was to examine the effect of eccentric isotonic training on hamstring flexibility and eccentric and concentric isokinetic peak torque in trained and untrained subjects. Methods: Sixty healthy subjects (mean age: 21.66 ± 2.64) were divided into three equal groups, each with 20 voluntary participants. Two experimental groups (untrained and trained groups) participated in a hamstring eccentric isotonic strengthening program (five days/week) for a six-week period and one control group that was not involved in the training program. The passive knee extension range of motion and hamstring eccentric and concentric isokinetic peak torque were measured at angular velocities 60° and 120°/s for all groups before and after the training period. Results: Two-way analysis of variance showed that there was a significant increase in the hamstring flexibility of the untrained and trained groups (25.65 ± 6.32°, 26.55 ± 5.99°, respectively), (p < 0.05) without a significant increase in the control group (31.55 ± 5.84°), (p > 0.05). Moreover, there was a significant increase in eccentric isokinetic peak torque of both the untrained and trained groups (127.25 ± 22.60Nm, 139.65 ± 19.15Nm, 125.40 ± 21.61Nm, 130.90 ± 18.71Nm, respectively), (p < 0.05) without a significant increase in the control group (109.15 ± 20.89Nm, 105.70 ± 21.31Nm, respectively), (p > 0.05) at both angular velocities. On the other hand, there was no significant increase in the concentric isokinetic peak torque of the three groups (92.50 ± 20.50Nm, 79.05 ± 18.95Nm, 92.20 ± 21.96Nm, 79.85 ± 18.97Nm, 100.45 ± 25.78Nm, 83.40 ± 23.73Nm, respectively), (p > 0.05) at both angular velocities. The change scores in the hamstring flexibility (06.25 ± 1.86°) and eccentric peak torque of the untrained group (16.60 ± 4.81Nm, 17.45 ± 5.40Nm, respectively) were significantly higher (p < 0.05) than those of the trained group (03.40 ± 1.14°, 9.90 ± 5.14Nm, 9.80 ± 7.57Nm, respectively), and the control group (00.90 ± 2.10°, 0.60 ± 2.93Nm, 1.40 ± 3.53Nm, respectively), at both angular velocities. Meanwhile, the change scores of the concentric peak torques of the three groups (1.15 ± 1.50Nm, −0.15 ± 2.16Nm, 1.35 ± 1.63Nm, 0.20 ± 2.95Nm, 0.60 ± 2.28Nm, −0.30 ± 2.25Nm) were statistically insignificant (p > 0.05). Conclusion: After a six-week period of eccentric isotonic training, the hamstring eccentric peak torque and flexibility of trained and untrained groups improved without changes in the concentric peak torque. Moreover, the improvement of untrained subjects was higher than trained subjects. These findings may be helpful in designing the hamstring rehabilitation program. Keywords: Eccentric exercise, Extensibility, Hamstring, Muscle torque, Trained subjectshttp://www.sciencedirect.com/science/article/pii/S1017995X17302110 |
| spellingShingle | Amr Almaz Abdel-aziem Elsadat Saad Soliman Osama Ragaa Abdelraouf Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects Acta Orthopaedica et Traumatologica Turcica |
| title | Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects |
| title_full | Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects |
| title_fullStr | Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects |
| title_full_unstemmed | Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects |
| title_short | Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects |
| title_sort | isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training trained versus untrained subjects |
| url | http://www.sciencedirect.com/science/article/pii/S1017995X17302110 |
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