A Single Session of Repeated Bouts of Muscle Fatigue Caused Alterations in Peak Ground Reaction Force during 60 cm Drop Landings

2010 ◽  
Vol 42 ◽  
pp. 686
Author(s):  
David J. Dominguese ◽  
Jeff G. Seegmiller ◽  
Michael Clevidence ◽  
Andrew Krause
Keyword(s):  
Muscle Fatigue ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Single Session ◽  
Drop Landings

Alterations in Peak Ground-Reaction Force During 60-cm Drop Landings Caused by a Single Session of Repeated Wingate Anaerobic Tests

2012 ◽  
Vol 21 (4) ◽  
pp. 306-312 ◽  
Author(s):  
David J Dominguese ◽  
Jeff Seegmiller ◽  
B. Andrew Krause
Keyword(s):  
Muscle Fatigue ◽  
Outcome Measures ◽  
Ground Reaction Force ◽  
Repeated Measures ◽  
Reaction Force ◽  
Lower Extremity Injury ◽  
Single Session ◽  
Drop Landing ◽  
Significant Difference ◽  
Drop Landings

Context:Lower extremity injury is prevalent among individuals participating in sports. Numerous variables have been reported as predisposing risk factors to injury; however, the effects of muscle fatigue on landing kinetics are unclear.Objectives:To investigate the effects of a single session of repeated muscle fatigue on peak vertical ground-reaction force (GRF) during drop landings.Design:Mixed factorial with repeated measures.Setting:Controlled laboratory.Participants:10 female and 10 male healthy recreational athletes.Intervention:Subjects performed 3 fatigued drop landings (60 cm) after four 20-s Wingate anaerobic tests (WATs) with 5 min of active recovery between fatigued conditions.Main Outcome Measures:Kinetic data of peak forefoot (F1) force, peak rear-foot (F2) force, and anteroposterior (AP) and mediolateral (ML) forces at both F1 and F2.Results:A significant main effect was observed in the nonfatigued and fatigued drop landings in respect to peak F2 force. The greatest significant difference was shown between the first fatigued drop-landing condition and the last fatigued drop-landing condition. No significant difference was observed between genders for all GRF variables across fatigue conditions.Conclusion:A single session of repeated conditions of anaerobic muscle fatigue induced by WATs caused an initial reduction in peak F2 force followed by an increase in peak F2 force across conditions. Muscle fatigue consequently alters landing kinetics, potentially increasing the risk of injury.

Does Wearing a Prophylactic Ankle Brace During Drop Landings Affect Lower Extremity Kinematics and Ground Reaction Forces?

2013 ◽  
Vol 29 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Kathy J. Simpson ◽  
Jae P. Yom ◽  
Yang-Chieh Fu ◽  
Scott W. Arnett ◽  
Sean O’Rourke ◽  
...  
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Ground Reaction Force ◽  
External Rotation ◽  
Reaction Force ◽  
Knee Joints ◽  
Ground Reaction Forces ◽  
Ankle Brace ◽  
Reaction Forces ◽  
Drop Landings

The objective of the study was to determine if prophylactic ankle bracing worn by females during landings produces abnormal lower extremity mechanics. Angular kinematic and ground reaction force (GRF) data were obtained for 16 athletically experienced females who performed brace and no-brace drop landings. The brace condition displayed reduced in/external rotation and flexion displacements about the ankle and knee joints and increased vertical and mediolateral GRF peak magnitudes and rate of vertical GRF application (pairedttest,P< .05). The ankle and knee joints landed in a less plantar flexed and more flexed position, respectively. No significant ab/adduction outcomes may have occurred due to interparticipant variability and/or a lack of brace restriction. Conclusion: During typical landings, this lace-up brace increases vertical GRF, decreases ankle and knee joint displacements of flexion and int/external rotation, but minimally affects ab/adduction displacements.

Effect of Lower Limb Muscle Fatigue on Ground Reaction Force Components During Landing in People With Nonspecific Chronic Low Back Pain

2019 ◽  
Vol 28 (8) ◽  
pp. 847-853
Author(s):  
Ali Jalalvand ◽  
Mehrdad Anbarian
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Muscle Fatigue ◽  
Ground Reaction Force ◽  
Lower Limb ◽  
Healthy Subjects ◽  
Reaction Force ◽  
Low Back ◽  
Force Development ◽  
Force Components

Context: The link between landing parameters and lower limb muscle fatigue in association with chronic low back pain (CLBP) is not well understood. Objective: To examine the effects of fatigue on the ground reaction force components during landing in people with nonspecific CLBP. Design: Quasi-experimental study. Setting: Clinical biomechanics laboratory. Participants: A total of 44 subjects were equally divided into a healthy group and a group with CLBP. Main Outcome Measures: The ground reaction force along anterior–posterior (y) and medial–lateral (x) and vertical (z) axes, time to peak (TTP), the rate of force development, and impulses for all axes were calculated. A repeated-measures analysis of variance (group × fatigue) was used to compare the data among groups. Results: In the unfatigued conditions, the amplitudes of Fy3, Fz2, and TTP of Fy1, Fy2, Fz1, Fz2, Fz3, Fz4, rate of force development in Y in the CLBP subjects are significantly different than those in the healthy subjects (P < .05). In the fatigued conditions, the amplitudes of Fz2, Fz3, Fz4, and TTP of Fy2, Fy3, Fy4, Fz2, impulses of X2, Z in the CLBP group were significantly different than those in the healthy subjects (P < .05). Within-group comparisons of measured Fx1, Fy1, Fy2, Fz2, Fz4 and TTP of Fx1, Fy1, Fy2, Fz2, Fz3, Fz4, impulses of X2, z were significantly different from prefatigue to postfatigue in the healthy group (P < .05). Within-group comparisons of measured Fx1, Fy1, Fz1, Fz2 and TTP of Fx5, Fz1, impulses of X2 were significantly differed from prefatigue to postfatigue in the CLBP group (P < .05). Conclusions: It seems that TTP of ground reaction force variables in CLBP may have clinical values for rehabilitation. Muscle fatigue altered landing performance. However, patients with CLBP will respond differently to lower-extremity fatigue. These altered variables in patients with low back pain are the cause of future injuries or lower-extremity injuries that need to be addressed in further studies.

EFFECTS OF SEGMENTAL MOTION ON GROUND REACTION FORCE DURING DROP LANDINGS

2007 ◽  
Vol 40 ◽  
pp. S751
Author(s):  
Yasuyuki Yoshida ◽  
Shuji Suzuki ◽  
Takeo Maruyama
Keyword(s):  
Ground Reaction Force ◽  
Reaction Force ◽  
Segmental Motion ◽  
Drop Landings

Ground Reaction Force during Forward-Side Jump in Individuals Following Muscle Fatigue Exercises

2015 ◽  
Vol 47 ◽  
pp. 837
Author(s):  
Brian P. Wiseman ◽  
Hyunsoo Kim ◽  
Seongjun Son ◽  
Matthew Seeley ◽  
J. Ty Hopkins
Keyword(s):  
Muscle Fatigue ◽  
Ground Reaction Force ◽  
Reaction Force
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