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Multiplanar knee laxity increases during a 90-min intermittent exercise protocol.

Sandra J Shultz¹, Randy J Schmitz, John R Cone

¹Applied Neuromechanics Research Laboratory, University of North Carolina at Greensboro, Greensboro, NC 27402, USA. sjshultz@uncg.edu

Medicine and Science in Sports and Exercise

|March 9, 2013

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Female athletes showed increased knee laxity during intermittent exercise, unlike males. Some individuals, regardless of sex, experienced significant knee laxity changes, potentially impacting injury risk.

Area of Science:

Sports Medicine
Biomechanics
Exercise Physiology

Background:

Understanding sex-based differences in knee laxity during exercise is crucial for injury prevention.
Intermittent exercise protocols simulate demands of sports like soccer, making them relevant for athlete research.

Purpose of the Study:

To investigate changes in anterior-posterior (AP LAX), valgus-varus (VV LAX), and internal-external rotation (IER LAX) knee laxity.
To compare these changes between males and females during a soccer-specific intermittent exercise protocol (IEP).

Main Methods:

Intercollegiate athletes (29 females, 30 males) underwent laxity testing (AP LAX, VV LAX, IER LAX).
Measurements were taken before, during, and after an intermittent exercise protocol (IEP) and compared to a control condition.

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Main Results:

Females exhibited increased AP LAX and VV LAX during the IEP, while males did not.
Both sexes showed increased IER LAX throughout the exercise protocol.
Individual variations in laxity changes were considerable, with a higher proportion of females showing substantial increases in AP LAX and VV LAX.

Conclusions:

Exercise-induced knee laxity changes were more pronounced in females.
A subset of both male and female athletes experienced significant knee laxity increases during exercise.
Further research is needed to determine if these laxity changes correlate with increased lower extremity injury risk.