Asymmetries in explosive strength following anterior cruciate ligament reconstruction
Апстракт
Background: Despite its apparent functional importance, there is a general lack of data regarding the time-related changes in explosive strength and the corresponding side-to-side asymmetries in individuals recovering from an ACL reconstruction (ACLR). The present study was designed to assess changes in the maximum and explosive strength of the quadriceps and hamstring muscles in athletes recovering from an ACLR. Methods: Twenty male athletes with an ACL injury completed a standard isometric testing protocol pre-ACLR, four and six months post-ACLR. In addition to the maximum strength (F-max), the explosive strength of quadriceps and hamstrings was assessed through four variables derived from the slope of the force-time curves over various time intervals (REDmax, RED50, RFD150 and RED250). Side-to-side asymmetries were calculated relative to post-ACLR measures of the uninvolved leg ("standard" asymmetries), and relative to pre-ACLR value of the uninvolved leg ("real" asymmetries). Resul...ts: Pre-ACLR asymmetries in quadriceps RFD (average 26%) were already larger than in F-max (14%) (p lt 0.05). Six months post-ACLR real asymmetries in RFD variables (33-39%) were larger than the corresponding standard asymmetries (26-28%; p lt 0.01). Average asymmetries in hamstrings' RFD and F-max were 10%, 25% and 15% for pre-ACLR and two post-ACLR sessions, respectively (all p gt 0.05). Conclusions: In addition to the maximum strength, the indices of explosive strength should also be included in monitoring recovery of muscle function following an ACLR. Furthermore, pre-injury/reconstruction values should be used for the post-ACLR side-to-side comparisons, providing a more valid criterion regarding the muscle recovery and readiness for a return to sports.
Кључне речи:
ACL / Strength / Rate of force development / Quadriceps / HamstringsИзвор:
Knee, 2014, 21, 6, 1039-1045Издавач:
- Elsevier Science Bv, Amsterdam
Финансирање / пројекти:
- United States Department of Health & Human Services, National Institutes of Health (NIH) - USA [R21AR06065]
- United States Department of Health & Human Services, National Institutes of Health (NIH) - USANIH National Institute of Arthritis & Musculoskeletal & Skin Diseases (NIAMS) [R21AR060659, R2
- Мишићни и неурални фактори хумане локомоције и њихове адаптивне промене (RS-MESTD-Basic Research (BR or ON)-175037)
- Неинвазивна модулација кортикалне ексцитабилности и пластицитета - Развој метода неинвазивне неуромодулације централног нервног система у испитивања физиолошких механизама, дијагностици и терапији (RS-MESTD-Basic Research (BR or ON)-175012)
DOI: 10.1016/j.knee.2014.07.021
ISSN: 0968-0160
PubMed: 25112209
WoS: 000347868700010
Scopus: 2-s2.0-84926251931
Институција/група
Institut za medicinska istraživanjaTY - JOUR AU - Knežević, Olivera AU - Mirkov, Dragan M. AU - Kadija, Marko AU - Nedeljković, Aleksandar AU - Jarić, Slobodan PY - 2014 UR - http://rimi.imi.bg.ac.rs/handle/123456789/543 AB - Background: Despite its apparent functional importance, there is a general lack of data regarding the time-related changes in explosive strength and the corresponding side-to-side asymmetries in individuals recovering from an ACL reconstruction (ACLR). The present study was designed to assess changes in the maximum and explosive strength of the quadriceps and hamstring muscles in athletes recovering from an ACLR. Methods: Twenty male athletes with an ACL injury completed a standard isometric testing protocol pre-ACLR, four and six months post-ACLR. In addition to the maximum strength (F-max), the explosive strength of quadriceps and hamstrings was assessed through four variables derived from the slope of the force-time curves over various time intervals (REDmax, RED50, RFD150 and RED250). Side-to-side asymmetries were calculated relative to post-ACLR measures of the uninvolved leg ("standard" asymmetries), and relative to pre-ACLR value of the uninvolved leg ("real" asymmetries). Results: Pre-ACLR asymmetries in quadriceps RFD (average 26%) were already larger than in F-max (14%) (p lt 0.05). Six months post-ACLR real asymmetries in RFD variables (33-39%) were larger than the corresponding standard asymmetries (26-28%; p lt 0.01). Average asymmetries in hamstrings' RFD and F-max were 10%, 25% and 15% for pre-ACLR and two post-ACLR sessions, respectively (all p gt 0.05). Conclusions: In addition to the maximum strength, the indices of explosive strength should also be included in monitoring recovery of muscle function following an ACLR. Furthermore, pre-injury/reconstruction values should be used for the post-ACLR side-to-side comparisons, providing a more valid criterion regarding the muscle recovery and readiness for a return to sports. PB - Elsevier Science Bv, Amsterdam T2 - Knee T1 - Asymmetries in explosive strength following anterior cruciate ligament reconstruction EP - 1045 IS - 6 SP - 1039 VL - 21 DO - 10.1016/j.knee.2014.07.021 ER -
@article{ author = "Knežević, Olivera and Mirkov, Dragan M. and Kadija, Marko and Nedeljković, Aleksandar and Jarić, Slobodan", year = "2014", abstract = "Background: Despite its apparent functional importance, there is a general lack of data regarding the time-related changes in explosive strength and the corresponding side-to-side asymmetries in individuals recovering from an ACL reconstruction (ACLR). The present study was designed to assess changes in the maximum and explosive strength of the quadriceps and hamstring muscles in athletes recovering from an ACLR. Methods: Twenty male athletes with an ACL injury completed a standard isometric testing protocol pre-ACLR, four and six months post-ACLR. In addition to the maximum strength (F-max), the explosive strength of quadriceps and hamstrings was assessed through four variables derived from the slope of the force-time curves over various time intervals (REDmax, RED50, RFD150 and RED250). Side-to-side asymmetries were calculated relative to post-ACLR measures of the uninvolved leg ("standard" asymmetries), and relative to pre-ACLR value of the uninvolved leg ("real" asymmetries). Results: Pre-ACLR asymmetries in quadriceps RFD (average 26%) were already larger than in F-max (14%) (p lt 0.05). Six months post-ACLR real asymmetries in RFD variables (33-39%) were larger than the corresponding standard asymmetries (26-28%; p lt 0.01). Average asymmetries in hamstrings' RFD and F-max were 10%, 25% and 15% for pre-ACLR and two post-ACLR sessions, respectively (all p gt 0.05). Conclusions: In addition to the maximum strength, the indices of explosive strength should also be included in monitoring recovery of muscle function following an ACLR. Furthermore, pre-injury/reconstruction values should be used for the post-ACLR side-to-side comparisons, providing a more valid criterion regarding the muscle recovery and readiness for a return to sports.", publisher = "Elsevier Science Bv, Amsterdam", journal = "Knee", title = "Asymmetries in explosive strength following anterior cruciate ligament reconstruction", pages = "1045-1039", number = "6", volume = "21", doi = "10.1016/j.knee.2014.07.021" }
Knežević, O., Mirkov, D. M., Kadija, M., Nedeljković, A.,& Jarić, S.. (2014). Asymmetries in explosive strength following anterior cruciate ligament reconstruction. in Knee Elsevier Science Bv, Amsterdam., 21(6), 1039-1045. https://doi.org/10.1016/j.knee.2014.07.021
Knežević O, Mirkov DM, Kadija M, Nedeljković A, Jarić S. Asymmetries in explosive strength following anterior cruciate ligament reconstruction. in Knee. 2014;21(6):1039-1045. doi:10.1016/j.knee.2014.07.021 .
Knežević, Olivera, Mirkov, Dragan M., Kadija, Marko, Nedeljković, Aleksandar, Jarić, Slobodan, "Asymmetries in explosive strength following anterior cruciate ligament reconstruction" in Knee, 21, no. 6 (2014):1039-1045, https://doi.org/10.1016/j.knee.2014.07.021 . .