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Comparison of intersegmental tibiofemoral joint forces and muscle activity during various closed kinetic chain exercises.

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Title: Comparison of intersegmental tibiofemoral joint forces and muscle activity during various closed kinetic chain exercises.
Authors: Stuart MJ (AUTHOR), Meglan DA (AUTHOR), Lutz GE (AUTHOR), Growney ES (AUTHOR), An K (AUTHOR)
Source: American Journal of Sports Medicine. Nov/Dec96, Vol. 24 Issue 6, p792-799. 8p.
Abstract: The purpose of this study was to analyze intersegmental forces at the tibiofemoral joint and muscle activity during three commonly prescribed closed kinetic chain exercises: the power squat, the front squat, and the lunge. Subjects with anterior cruciate ligament-intact knees performed repetitions of each of the three exercises using a 223-N (50-pound) barbell. The results showed that the mean tibiofemoral shear force was posterior (tibial force on femur) throughout the cycle of all three exercises. The magnitude of the posterior shear forces increased with knee flexion during the descent phase of each exercise. Joint compression forces remained constant throughout the descent and ascent phases of the power squat and the front squat. A net offset in extension for the moment about the knee was present for all three exercises. Increased quadriceps muscle activity and decreased hamstring muscle activity are required to perform the lunge as compared with the power squat and the front squat. A posterior tibiofemoral shear force throughout the entire cycle of all three exercises in these subjects with anterior cruciate ligament-intact knees indicates that the potential loading on the injured or reconstructed anterior cruciate ligament is not significant. The magnitude of the posterior tibiofemoral shear force is not likely to be detrimental to the injured or reconstructed posterior cruciate ligament. These conclusions assume that the resultant anteroposterior shear force corresponds to the anterior and posterior cruciate ligament forces. [ABSTRACT FROM AUTHOR]
Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Education Research Complete
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Comparison of intersegmental tibiofemoral joint forces and muscle activity during various closed kinetic chain exercises.
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  Data: <searchLink fieldCode="AR" term="%22Stuart+MJ%22">Stuart MJ</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meglan+DA%22">Meglan DA</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lutz+GE%22">Lutz GE</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Growney+ES%22">Growney ES</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22An+K%22">An K</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22American+Journal+of+Sports+Medicine%22">American Journal of Sports Medicine</searchLink>. Nov/Dec96, Vol. 24 Issue 6, p792-799. 8p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The purpose of this study was to analyze intersegmental forces at the tibiofemoral joint and muscle activity during three commonly prescribed closed kinetic chain exercises: the power squat, the front squat, and the lunge. Subjects with anterior cruciate ligament-intact knees performed repetitions of each of the three exercises using a 223-N (50-pound) barbell. The results showed that the mean tibiofemoral shear force was posterior (tibial force on femur) throughout the cycle of all three exercises. The magnitude of the posterior shear forces increased with knee flexion during the descent phase of each exercise. Joint compression forces remained constant throughout the descent and ascent phases of the power squat and the front squat. A net offset in extension for the moment about the knee was present for all three exercises. Increased quadriceps muscle activity and decreased hamstring muscle activity are required to perform the lunge as compared with the power squat and the front squat. A posterior tibiofemoral shear force throughout the entire cycle of all three exercises in these subjects with anterior cruciate ligament-intact knees indicates that the potential loading on the injured or reconstructed anterior cruciate ligament is not significant. The magnitude of the posterior tibiofemoral shear force is not likely to be detrimental to the injured or reconstructed posterior cruciate ligament. These conclusions assume that the resultant anteroposterior shear force corresponds to the anterior and posterior cruciate ligament forces. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1177/036354659602400615
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        Text: English
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              M: 11
              Text: Nov/Dec96
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