مجال
التميز
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تميز دراسي
وبحثي وإبداع علمي
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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The reliability of biomechanical
variables collected during single leg squat and landing tasks
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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July 2014
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موجز عن البحث:
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Introduction:
The aim of
this study was to determine the within- and between-day reliability of lower
limb biomechanical variables collected during single leg squat (SLS) and
single leg landing (SLL) tasks.
Methods:
15 recreational athletes took part in three testing sessions,
two sessions on the same day and another session one week later. Kinematic
and kinetic data was gathered using a ten-camera movement analysis system
(Qualisys) and a force platform (AMTI) embedded into the floor.
Results:
The combined
averages of within-day ICC values (ICCSLS = 0.87; ICCSLL = 0.90)
were higher than between-days (ICCSLS = 0.81; ICCSLL = 0.78).
Vertical GRF values (ICCSLS = 0.90; ICCSLL = 0.98)
were more reliable than joint angles (ICCSLS = 0.85; ICCSLL = 0.82)
and moments (ICCSLS = 0.83; ICCSLL = 0.87).
Discussion:
This study demonstrates that all joint angles, moments, and
vertical ground reaction force (GRF) variables obtained during both tasks
showed good to excellent consistency with relatively low standard error of
measurement values. These findings would be of relevance to practitioners who
are using such measures for screening and prospective studies of
rehabilitative techniques.
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البحث (2):
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عنوان البحث:
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How reliable
are lower limb biomechanical variables during running and cutting tasks
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رابط إلى البحث:
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Click
here
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تاريخ النشر:
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01/07/2016
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موجز عن البحث:
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The purpose of this
study was to compare the within- and between-days reliability of lower limb
biomechanical variables collected during running and cutting tasks. Methods:
15 recreational athletes took part in three testing sessions, two sessions on
the same day with an hour gap and another session one week later. Results:
During both tasks, within-day ICC values for joint angles were higher than
between days. Out of five moments tested in each task, within-day ICC values
were higher than between days. During running task, within and between-day
SEM values for joint moments ranged between (0.07–0.39 N m kg) and between
(0.98_–5.14_) for joint angles. While during cutting, SEM values for moments
ranged between (0.13– 0.56 N m kg) and between (1.73–5.15) for joint angle
measurement. The GRF data, in both tasks, were more reliable (ICCrunP0.84 and
ICCcutP0.88) as compared to angles (ICCrunP0.51 and ICCcutP0.42), and moments
(ICCrunP0.58 and ICCcutP0.79) data. These findings are relevant to those
undertaking intervention studies because of the potential for large
measurement variability when examining certain variables, which would then
require considerable changes in these variables to show ‘‘real” effects of
the interventions beyond measurement error.
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المؤتمرات العلمية:
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المؤتمر (1):
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عنوان المؤتمر:
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World Conference on Prevention of
Injury & Illness in Sport, Monaco 2014
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تاريخ الإنعقاد:
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April 2014
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مكان
الإنعقاد:
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Monaco
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طبيعة المشاركة:
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Poster presentation
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عنوان المشاركة:
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Relationships Between Lower Limb
Biomechanics During Single Leg Squat with Running and Cutting Tasks; A
preliminary Investigation
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ملخص المشاركة:
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Background: The need to develop screening tests to
find athletes who maybe predisposed to knee injuries is of prime importance
in order to design individualised intervention programmes. Previous research
has found 3D joint kinematics of the hip and knee during a single leg squat
(SLS) to be related to those during jogging (Whatman et al., 2011). Thus,
further investigation as a potential screening test is warranted.
Objective: To investigate the relationship
between peak 3D kinematic variables during SLS with those occurring during
running (RUN) and 90° cutting (CUT) tasks.
Design A correlational study.
Setting Undertaken in the human
performance laboratory at the University of Salford.
Participants 15 recreational athletes,
7 males and 8 females, (age 25.2±5.1 years; height 1.6±7.38 m; and mass 67.6
±10.93 kg) were recruited.
Interventions A ten-camera motion
analysis system (Qualisys) and a force platform (AMTI) were used to collect
kinematic variables during SLS, RUN, & CUT tasks. Visual 3D (C-Motion,
USA) was used to process all data. Pearson correlation coefficients were used
to evaluate the association between 3D variables among the three tasks.
Main outcome measurements Hip and knee
joint angles.
Result: SLS was strongly correlated to run in
knee valgus and hip internal rotation (r=0.70 and 0.76, respectively), and
showed moderate correlation with knee external rotation (0.42).
SLS and CUT were moderate to strongly
correlate to each other in knee valgus, knee flexion, and hip internal
rotation (r=0.54, 0.69, and 0.54, respectively), and moderately in hip
flexion (r=0.38).
Discussion: The findings of this study provide
evidence that performance of SLS relates to performance of other tasks
(running and cutting). In those individuals displaying poor motion (excessive
angles) during SLS this is likely to be predictive of poor motion during
running and cutting, so could negate the need for assessing individuals
during these tasks
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عنوان المشاركة 2:
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The Relationship Between 2d knee Valgus
Angle During Single Leg Squat (sls), Single Leg Landing (sll), And Forward
Running
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ملخص المشاركة 2:
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Background: Two-dimensional
(2D) analysis of knee valgus during common athletic screening tasks such as
SLS has been purported to identify individuals who may be at a high-risk of
ACL injury. There is limited literature exploring the relationships between
joint motion during SLS and other athletic tasks associated with knee joint
injuries, in order to evaluate the effectiveness of the SLS to identify
athletes with hazardous knee motion in a range of athletic tasks.
Objective: To assess the
relationship between the 2D knee valgus angle among three tasks (SLS, SLL,
and Running).
Design: A
correlational study.
Setting Undertaken in
the Human Performance Laboratory at the University of Salford.
Participants: 15
recreational athletes, 7 males and 8 females, were recruited (age 25.2±5.1
years; height 1.6±7.38 m;
and mass 67.6±10.93 kg).
Intervention: Participants
performed a series of SLS, SLL from a 31-cm step, and forward running at
percieved maximum speed whilst being videotaped with a 2D digital camera.
Main outcome measurements: Maximum right knee valgus angle was quantified by measuring the
frontal plane projection angle (FPPA) using Quintic Biomechanics v21 software
package.
Results: A moderate
correlation was shown between FPPA during SLS and SLL when the whole
participant group was analysed (r=0.35). When split by gender female
statistics showed good correlations between the majority of tasks; SLS and
SLL (r=0.87), SLS and Run (r=0.59) but weaker between SLL and Run (0.26).
Conclusions: In females the FPPA during SLS
correlates with FPPA during SLL and running. This indicates that if a female
patient has increased FPPA during SLS they are likely to have increased FPPA
across all the tasks. This could potentially reduce the time and tasks
required for screening, as only one task would need to be assessed. In males
there is little correlation between tasks so the same would not apply in male
subjects.
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المؤتمر (2):
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عنوان المؤتمر:
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The 22nd Annual meeting of the European Society for Movement
Analysis in Adults and Children (ESMAC 2013)
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تاريخ الإنعقاد:
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Sept 2013
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مكان
الإنعقاد:
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Glasgow, UK
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طبيعة المشاركة:
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Poster presentation
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عنوان المشاركة:
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The Consistency of Knee Kinematic,
Kinetic, and Ground Reaction Force Variables Collected During Running and
Cutting Manoeuvres
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ملخص المشاركة:
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Introduction: Abnormal
biomechanics during sports activities can lead to increased joint-reaction
forces, an increased valgus angle and increased load at the knee. The
majority of studies that assess lower-limb biomechanics commonly use 3D
motion analysis techniques, which allow clinicians and researchers to
quantify all three planes of joint motion during complex tasks. The purpose
of this study, however, was to compare the within-day and between-days
reliability of discrete kinematic, kinetic and ground reaction force (GRF)
data for the knee joint collected during running and changing direction
tasks.
Methods: Sixteen
uninjured recreational athletes, eight males and eight females, took part in
three testing sessions. Their mean ± standard deviation age, height
and mass was 26.2 ± 5.1years, 1.67 ± 7.1 m,
67.1 ± 10.5 kg, respectively. Each participant underwent two
sessions on the same day and another session one week later. A ten-camera
motion analysis system (Qualisys, sampled at 240 Hz) and a force
platform (AMTI, sampled at 1200 Hz) embedded into the floor, was used to
collect kinematic and kinetic data during the support phase. For the running
trials, subjects were required to touch the force platform with their right
leg while running along a 10 m runway. For the cutting task, they were
required to contact the force platform and immediately turn 90° to the left
and run 3 metres in that direction. Approach speeds for both tasks were
required to fall between 3.5 and 5.5 m s−1.
Results: Table 1 and Table 2 shows that
between-day ICCs were lower as compared to within-day ICCs. Specifically,
seven of 12 between-day measures fell below an ICC value of 0.75 compared to
two of 12 within-day measures.
Transverse plane ICCs ranged from 0.40 to
0.80, whereas frontal and sagittal planes ranged from 0.42 to 97. GRF data
were more reliable within day than between days as compared to kinematic and
kinetic data.
Discussion and conclusion: In the
first comparison, between-day kinematic and kinetic ICC values were lower
than within-day values, which is in agreement with previous studies [1], [2] and [4]. Several
factors may contribute to the reduced consistency during repeated
measurements, such as errors in marker reapplication, static alignment and
tasks difficulty [4]. As
expected, GRF data were more consistent than kinematic data, since GRF data
are representative of the sum of all the segmental masses and accelerations [3], and less
variability will be seen as compared to individual joint kinetic or kinematic
patterns. Also, no markers are necessary to collect GRF data and will therefore
be more consistent [2]. These kinds
of investigations should be performed before undertaking studies which
involve repeated measurements of the same participant over time.
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المؤتمر (3):
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عنوان المؤتمر:
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7th Saudi Students
Conference-UK
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تاريخ الإنعقاد:
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1-2 Feb 2014
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مكان
الإنعقاد:
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Edinburgh, UK
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طبيعة المشاركة:
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Poster presentation
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عنوان المشاركة:
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The consistency of knee kinematic and
kinetic variables collected during running and cutting manoeuvres
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ملخص المشاركة:
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Introduction: Abnormal
biomechanics during sports activities can lead to increased joint-reaction
forces, an increased valgus angle and increased load at the knee. The
majority of studies that assess lower-limb biomechanics commonly use 3D
motion analysis techniques, which allow clinicians and researchers to
quantify all three planes of joint motion during complex tasks. The purpose
of this study, however, was to compare the within-day and between-days
reliability of discrete kinematic, kinetic and ground reaction force (GRF)
data for the knee joint collected during running and changing direction
tasks.
Methods: Sixteen
uninjured recreational athletes, eight males and eight females, took part in
three testing sessions. Their mean ± standard deviation age, height and mass
was 26.2 ± 5.1years, 1.67 ± 7.1 m, 67.1 ± 10.5 kg, respectively. Each
participant underwent two sessions on the same day and another session one
week later. A ten-camera motion analysis system (Qualisys, sampled at 240 Hz)
and a force platform (AMTI, sampled at 1200 Hz) embedded into the floor, was
used to collect kinematic and kinetic data during the support phase. For the
running trials, subjects were required to touch the force platform with their
right leg while running along a 10 m runway. For the cutting task, they were
required to contact the force platform and immediately turn 90° to the left
and run 3 metres in that direction. Approach speeds for both tasks were required
to fall between 3.5 and 5.5 m s−1.
Results: Table 1 and
Table 2 shows that between-day ICCs were lower as compared to within-day
ICCs. Specifically, seven of 12 between-day measures fell below an ICC value
of 0.75 compared to two of 12 within-day measures.
Transverse plane ICCs ranged from 0.40 to
0.80, whereas frontal and sagittal planes ranged from 0.42 to 97. GRF data
were more reliable within day than between days as compared to kinematic and
kinetic data.
Discussion and conclusion: In the first comparison, between-day kinematic and kinetic ICC
values were lower than within-day values, which is in agreement with previous
studies [1], [2] and [4]. Several factors may contribute to the reduced
consistency during repeated measurements, such as errors in marker
reapplication, static alignment and tasks difficulty [4]. As expected, GRF
data were more consistent than kinematic data, since GRF data are
representative of the sum of all the segmental masses and accelerations [3],
and less variability will be seen as compared to individual joint kinetic or
kinematic patterns. Also, no markers are necessary to collect GRF data and
will therefore be more consistent [2]. These kinds of investigations should
be performed before undertaking studies which involve repeated measurements
of the same participant over time.
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المؤتمر (4):
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عنوان المؤتمر:
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8th Saudi Students
Conference – UK
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تاريخ الإنعقاد:
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January 2015
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مكان
الإنعقاد:
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London, UK
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طبيعة المشاركة:
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Poster presentation
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عنوان المشاركة:
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The Association Between Lower Limb
Biomechanical
Variables During Typical Athletic Tasks
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ملخص المشاركة:
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Introduction: Abnormal
lower limb biomechanics during functional activity has been widely postulated
as a factor in the etiology of both traumatic and overuse knee injury. A
better understanding of the inter-task performance would provide insight
related to the consistency in motor patterns employed by athletes during
sports specific tasks. The aim of this study is to investigate the
association between biomechanical variables during single leg squat (SLS),
single leg landing (SLL), running, and 90° cutting tasks.
Methods: Fifty
recreational athletes, 33 males and 17 females (age 25.3 ± 4.1 years; height
171.3 ± 7.3 cm; and mass 69.6 ±9.5 kg) took part of this study. A ten-camera
motion analysis system (Pro-Reflex, Qualisys), and a force platform (AMTI)
were used to collect biomechanical variables and Visual 3D (C-Motion) was
used to process all data. Result Hip internal rotation and knee valgus angles
showed large to very large correlations (p= 0.53-0.75; p=0.59-0.83,
respectively) among all tasks. Knee valgus moment correlations were moderate
to good (r= 0.40-0.66) between SLS, SLL, & RUN. No correlation were found
in knee valgus moment during cutting with SLS & SLL, but it was moderate
with RUN (r= 0.37).
Discussion: The extent of
the kinematic and kinetic variables present during SLS & SLL would appear
to reflect those of more complex and higher load tasks or running and
cutting. This could have implications for the nature of the tasks required to
be assessed when investigating lower limb movement strategies with potentially
only simple tasks being required to define poor performance across a range of
tasks. What this study does not show is if manipulation of performance of
simple tasks such as SLS & SLL has an impact on the performance of the
more complex tasks of running and cutting.
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الجائزة (1):
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مسمى الجائزة:
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The 2nd Class
Prize for the Best Poster in Medical & Healthcare sectors
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الجهة المانحة:
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Saudi Conference Organising Committee
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تاريخ الجائزة:
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1-2 February 2014
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مجال التكريم:
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Health & Social Studies
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