dc.contributor.advisor | Ransone, Jack | |
dc.contributor.author | Wedding, Heather Ann ( ) | |
dc.date.accessioned | 2020-10-12T14:36:19Z | |
dc.date.available | 2020-10-12T14:36:19Z | |
dc.date.issued | 2009-05 | |
dc.identifier.citation | Wedding, H. A. (2009). The effect of muscle fatigue on lower extremity kinematics in physically active females (Unpublished thesis). Texas State University-San Marcos, San Marcos, Texas. | |
dc.identifier.uri | https://digital.library.txstate.edu/handle/10877/12750 | |
dc.description.abstract | Objective: To investigate the effect of fatigue on dynamic knee valgus and hip
joint movement during a single leg squat in physically active females. Design and
Setting: All data were collected in lowers Athletic Training Research Laboratory, Texas
State University-San Marcos. Subjects: Thirty healthy, physically active females (age =
21 + 2.13t years, mass = 61.02 + 7.33 kg, height = 167.34 + 6.08 cm, Q angle = 17.75 +
2.21 degrees) with no reports of injuries, impairments or surgeries to the low back or
lower extremities within the past two years. Measurements: All subjects stood on a box
(height specified and adjusted according to leg length) and then completed two single leg
squats to approximately 70 degrees of knee flexion prior to isokinetic strength testing and
after the fatigue protocol. Frontal plane knee motion and sagittal plane hip motion was
evaluated and recorded using two 2-D SportsCam High Speed Cameras. Isokinetic (60
deg/sec) concentric knee (flexion/extension) strength was measured and evaluated, followed by an immediate isokinetic (60 deg/sec) concentric knee (flexion/extension)
fatigue protocol. Subjects were evaluated as fatigued once they fell below 50% of the
previously recorded knee (flexion/extension) peak torque. Results: Two paired t-tests for
pre and post dynamic knee valgus and hip flexion angles were calculated. A significant
difference was found with hip flexion. The mean score on the posttest (136.48 + 10.98)
showed an increase in hip flexion angle when compared to the pretest (140.43 ± 10.03); t
(29) = 4.05, p < .01, accounting for 95% of the variance in the difference between the
scores. Paired t-tests for the pre and post mean dynamic valgum revealed no significant
difference during the single leg squat as hypothesized. Effect size for the difference
between pre and post fatigue dynamic valgum ranged from -1.29 to 3.20 and hip flexion
from -3.22 to 4.31 respectively. Conclusion: Frontal plane dynamic knee movement
showed no significant difference between pre and post fatigue assessments. However,
the sagittal plane mean hip flexion angle did report a significant difference between the
pre and post fatigue measurements. These results demonstrate the need for further
investigation of the role that the knee musculature plays in hip flexion angles during
dynamic movement, pre and post fatigue. | |
dc.format | Text | |
dc.format.extent | 64 pages | |
dc.format.medium | 1 file (.pdf) | |
dc.language.iso | en | |
dc.subject | Kinematics | |
dc.subject | Knee movements | |
dc.subject | Fatigue | |
dc.subject | Muscles | |
dc.title | The effect of muscle fatigue on lower extremity kinematics in physically active females | |
txstate.documenttype | Thesis | |
dc.contributor.committeeMember | Vela, Luzita | |
dc.contributor.committeeMember | Pankey, Robert | |
thesis.degree.department | Health, PE and Recreation | |
thesis.degree.grantor | Texas State University--San Marcos | |
thesis.degree.level | Masters | |
thesis.degree.name | Master of Science | |
txstate.access | restricted | |
dc.description.department | Health and Human Performance | |