Serial Subtraction Alters Lateral Step-down Tibiofemoral Kinematics in Healthy Adults
This study evaluated the effects of two types of cognitive dual-tasking on
three-dimensional knee kinematics during the lateral step-down. 19 healthy
individuals (22.05±1.61 yrs., 173.92±9.21 cm,
67.99±12.65 kg) participated in this study. Participants
completed 5 repetitions of a lateral step-down task for each leg and each
testing condition (control, Stroop, and serial subtraction by seven). An
electromagnetic motion sensor was attached to the femur via compression clamp
placed about the medial and lateral epicondyles. Another sensor was attached
2 cm below the ipsilateral tibial tuberosity. A custom MATLAB algorithm
located the knee joint axis of rotation from dynamic knee flexion and extension.
Discrete kinematics at peak flexion were used in this study. Paired samples
t-tests were used to compare average frontal, transverse, and sagittal plane
knee position at maximum flexion between conditions for each leg. No significant
differences were found for either limb between control and Stroop conditions.
Comparisons revealed significant differences in frontal and transverse plane
knee angles at peak flexion between the control and serial subtraction by seven
conditions. These findings indicate serial subtraction by seven requires
different cognitive processing abilities which may cause greater inte...
Source: International Journal of Sports Medicine - Category: Sports Medicine Authors: Thomas, Jacob Weiss, Samantha Bliss, Rebecca Guess, Trent Tags: Orthopedics & Biomechanics Source Type: research