مجال
التميز
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تميز دراسي و بحثي + جائزة تفوقية
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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Reliability of Hop
Distance and Frontal-Plane
Dynamic Knee Valgus Angle during Single-leg Horizontal Hop Test
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رابط إلى البحث:
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تاريخ النشر:
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28/12/2015
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موجز عن البحث:
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Context: Single-leg hop for
distance (SHD) performance and two dimensional (2-D) video assessment of
frontal-plane knee valgus, during the single-leg landings, have been reported
to identify the risk of knee injuries such as patellofemoral pain syndrome
and/or anterior cruciate ligament tears. There are limited studies
investigating the reliability and measurement error in single-leg hop for
distance test and the 2-D video analysis of knee valgus angle on landing from
this maximal forward hop.
Objective: To evaluate the
reliability and measurement error of hop distance and 2-D video assessment of
lower limb frontal-plane dynamic knee valgus on landing during the SHD task.
Design: Repeated measures
reliability study.
Participants:
12 recreationally active university students (8 men and 4 women 34.2 ± 3.1 y,
height 170.8 ± 6.5 cm; mass 82.1 ± 15.9 kg).Main outcome measurement: Within
and between-days reliability and measurement error values of hop performance
and 2-D frontalplane projection angle (FPPA) during SHD test.
Methods: For hop and 2-D
tests: participants performed maximal SHD with standard 2-D digital video
recording of the landing for assessment of
FPPA.
Results: For hop test
distance: the within-day ICCs showed good to excellent reliability
(0.89-0.93), and between-days ICCs were good, (0.85-0.90). Standard error of
measurement for SHD value ranged from 6.52-9.83 cm. FPPA on landing: the
within-day ICCs showed good reliability
(0.87 to 0.90),
and between-days ICCs were good, (0.81-0.88). Standard error of measurement
for 2-D values ranged from 1.33-1.61°.
Conclusions: Hop distance and 2-D
FPPA on landing during SHD were shown to be a reliable measure of lower
extremity performance and dynamic knee valgus. Using the measurement error
values existing along with previously published normative data, clinicians
can now make informed decisions about individual performance and variations
in performance/injury risk following interventions.
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البحث (2):
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عنوان البحث:
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Between Days
Reliability of 2D Video Analysis during Landing while Undertaking a Crossover
Hop Test
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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10/06/2016
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موجز عن البحث:
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The Crossover
Hop Test is a Functional Performance Test (FPT), which is used to demonstrate
the leg muscles strength and performance, and evaluate symmetry between lower
limbs, while evaluating the hop distance. Hop tests have been shown to be
reliable for both injured and active subjects. The current study aims to
establish the between days reliability of 2-Dimensional (2D) video analysis
measuring knee valgus angles (frontal plane projection angle; FPPA) during
each landing whilst undertaking a crossover hop test. Nine recreational male
athletes (age 33.89 ± 3.96, height 170 ± 8.59 cm, weight 86.94 ± 20.86 kg)
participated in the experiment. Each individual performed three repetitions
of the cross over hop test, for both legs, and then repeated the same test
seven days later. Results showed from the four landings that the first and
third, for both legs demonstrated excellent Intraclass Correlation
Coefficient (ICC) values for FPPA between days, while good to excellent ICC
values for FPPA of the second landing and moderate ICC values for FPPA for
the fourth. Standard Error Measurement (SEM) scores ranged from 1.04° to
2.42° for the right FPPA during the four landings, while the range of SEM
values for the left FPPA were from 0.82° to 2.08°. The landing strategy
adopted by participants, as defined by FPPA, would appear to be consistent
between sessions. Hence, researchers and clinicians will be able to use
crossover hop tests, which incorporate 2D video analysis, to assess
simultaneously the limbs’ performance functionality and the valgus angle of
the knee. Therefore, this will save the athletes’ and researchers’ time,
which will subsequently reduce the amount of fatigue resulting from over
testing.
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البحث (3):
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عنوان البحث:
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Force generation
status of female anterior cruciate ligament reconstruction patients prior to
return to sport
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رابط إلى البحث:
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here
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تاريخ النشر:
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10/04/2015
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موجز عن البحث:
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Context: Within
the literature a number of authors have indicated that significant
asymmetries in an individual limbs force development characteristics may be
present following Anterior Cruciate Ligament Reconstruction (ACLR) surgery.
Objective: To describe force development characteristics across a variety of
modes of testing in female athletes prior to return to sport. Design:
Descriptive cohort study. Setting: University Biomechanics Laboratory.
Patients or Other Participants: 10 female ACLR patients (aged 20 [+ or -] 2.1
years; body weight 61 [+ or -] 2.6 kgs). Participants were, in the final
stage of ACLR rehabilitation (6.9 [+ or -] 1.9 month’s post-surgery) and
cleared for return to full competitive sport, volunteered to participate. All
participants were full time athletes from a variety of sports, and had
received rehabilitation from the team-sport physical therapist (average 3
sessions per week). Main Outcome Measure(s): Three tests were assessed;
unilateral stance isometric mid-thigh pull (IMTP), 10 hop test and single hop
for distance. IMTP involved an isometric single leg squat on a force platform
pulling on a fixed bar at mid-thigh level (knee flexed 45[degrees]). 10 hop
test involved undertaking 10 consecutive hops on a force platform, with maximum
height each hop. The peak rate of force development (RFD) and peak force (PF)
were measured during IMTP and the 10 hop test. RFD was operationally defined
as the change in force divided by change in time of test period. Single hop
for distance was normalised to leg length. Limb symmetry index (LSI) was
calculated for all variables. Differences between limbs were assessed using
paired t-tests. Results: For the IMTP RFD was 88.7(:r40.2) Nkg.[s.sup.-1]
injured limb and 105.2([+ or -] 53.3) Nkg.[s.sup.-1] non-injured, LSI 86.4%,
PF was 23.9([+ or -]1.5) Nkg.[s.sup.-1] injured limb and 25.2([+ or -]0.7)
Nkg.[s.sup.-1], LSI 95%, for both measures there was a significant difference
between limbs (P = .016 and P = .014 respectively). For 10 hop test RFD was
526.3([+ or -] 108.4) Nkg.[s.sup.-1]injured limb and 612.3([+ or -]90)
Nkg.[s.sup.-1] non-injured, LSI 86.2%, PF was 29.7([+ or -] 4.2)
Nkg.[s.sup.-1] injured limb and 33.9([+ or -]3.9) Nkg.[s.sup.-1] non-injured,
LSI 88.6%, there was a significant difference between limbs for both measures
P = .01 and P = .024 respectively. The single hop for distance (% leg length)
was 151.8([+ or -]20.2)% for injured leg and 164.6([+ or -] 20.5)%
non-injured limb, LSI 92%, with a significant difference between limbs (P = .0001).
Conclusions: In line with previous research female ACLR patients prior to
return to sport show significant limb asymmetries in force production
capabilities. As rate of force development has been reported as a key element
in explosive muscle actions, rapid movements and reaction to perturbation,
these deficits may indicate potentially significant performance deficits in
these individuals. The results indicate the need to assess force generation
capacity when assessing performance in ACLR patients prior to return to
sport. Further research is required to assess if these deficits are related
to the high re-injury rates and poor outcomes in this group.
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المؤتمرات العلمية:
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المؤتمر (1):
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عنوان المؤتمر:
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The ANNUAL CONGRESS
ON SPORTS MEDICINE 2014
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تاريخ الإنعقاد:
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30/01/2014
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مكان
الإنعقاد:
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Kolding, Denmark
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طبيعة المشاركة:
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Poster Presentation
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عنوان المشاركة:
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The within and
between day reliability of a variety of tests associated with lower limb
functional performance
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ملخص المشاركة:
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Background:
There is limited
literature exploring the within and between day reliability of the five
tests: hop tests, knee valgus angle tests, balance tests, force tests, and
isokinetic muscle testing. These tests may help to investigate the causes
which may lead to lower limb injury especially ACL injuries. These individual
tests potentially form critical elements in the performance of hop tests,
before examining these relationships the reliability of each of the
individual tests needs to be established. Therefore, the aim of this study is
to investigate the reliability of these tests.
Objective:
To assess the within
and between day reliability of five different tests:
Hop tests, knee
valgus angle tests using 2D camera, balance tests using force plate (FP),
force tests using Ballistic Measurement System (BMS), and isokinetic muscle
testing using Biodex System.
Design:
A reliability study.
Participants:
12 recreational
athletes, 8males and 4 females, were recruited (age 34.16 ± 3.05 years;
height 1.7 ± 6.47 m; and mass 82.08 ± 15.94 kg).
Interventions:
In this study, there
are five different tests have been taken on both legs individually:
Hop tests: there are
two different tests under hop tests which are: hop for distance test and
cross over hop test. Knee valgus angle tests: there are two different tests
under knee valgus angle tests which are: hop for distance test and squat
test. Balance tests: there are three different tests under balance tests
which are: straight leg balance test, bent leg balance test, and hop for
distance balance test. Force tests: there are four different tests under
force tests which are: squat jump, countermovement jump, ten jumps, and
isometric pull. Isokinetic muscle strength tests: in this test there are four
different muscle strength tests which are: quadriceps muscle test, hamstring
muscle test, ankle plantar flexor muscles test, and hip extensor muscles
test.
Main Outcome
Measurements:
Hop tests: from the
above mentioned tests we measured the maximum point reached by the subjects
when hopping.
Knee valgus angle
tests: from the above
mentioned tests we measured the angle of knee valgus when reaching the
maximum knee flexion position. Balance tests: from the above mentioned tests
we measured the postural sway of the subjects throughout two tests which are:
straight leg and bent leg tests. While time to stability was measured during
hop land test. Force tests: from the above mentioned tests we measured six
different variables which are: maximum rate of force development (RFD), peak
force, peak power, peak velocity, time to peak force, and time to peak power.
Isokinetic muscle
strength tests: from the above mentioned tests we measured three different
variables which are: peak torque, peak torque to body weight, and the work to
body weight. All of the muscle strength tests have been applied in both
concentric and eccentric muscle actions.
Results and
conclusion:
In this study we can
clearly see that there are substantial to excellent reliably findings in the
most of the tests during Within-day and Between-days trials. However, there
are fair to moderate reliability data has been found in both time to peak
force and time to peak power while measuring the force during isometric pull
test only when testing both legs individually.
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المؤتمر (2):
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عنوان المؤتمر:
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The 10th Annual International Conference on
Kinesiology and Exercise Sciences
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تاريخ الإنعقاد:
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04/08/2014
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مكان
الإنعقاد:
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Athens, Greece
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طبيعة المشاركة:
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Oral Presentation
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عنوان المشاركة:
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The Association
between Single Leg Hop Distances and Various Tests of Force Production
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ملخص المشاركة:
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Background:
Hop tests are mostly
seen as physical performance measures of athletic function. These tests may
also be used for monitoring progress so as to be able to specify a return to
sport or normal activity in persons recovering from a sport injury or
surgical intervention. These different tests mix multiple elements together
when testing conditions such as joint stability, muscle strength and
neuromuscular coordination, which might be affected after any injury.
Muscular power has been considered as one of the essential elements of
dynamic athletic performance, especially in sporting occasions that involve
high force generation in a short period of time (Newton and Kraemer, 1994).
Therefore, the aim of this study is to investigate the association between
different force tests using Ballistic Measurement System and horizontal hop
for distance in healthy subjects.
Design:
A correlation study.
Setting:
Undertaken in the
Human Performance Laboratory at the University of Salford.
Participants:
20 recreational
athletes, 11 males and 9 females, were recruited (age 33.65±3.47 years;
height 170.9±5.87 cm; and mass 81.05±15.93 kg).
Interventions:
Two different tests
have been taken on both legs individually:
1- Hop for distance
test.
2- Force tests: there
are four different tests under this test which are: squat jump(SJ),
countermovement jump(CMJ), ten jumps, and isometric mid-thigh pull.
Main Outcome
Measurements:
1- Hop test: maximum
distance when undertaking single hop for distance.
2- Force tests: six
variables for SJ, CMJ, and ten jumps which are: maximum rate of force
development (RFD), peak force, peak power, peak velocity, time to peak force,
and time to peak power. While six different variables for isometric pull
which are: RFD, peak force, impulse 0-100ms, impulse 0-200ms, impulse
0-250ms, and impulse 0-300ms.
Results &
Conclusion:
Certain force
production tests show moderate significant correlations to the distance
hopped whilst others fail to show any association.
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المؤتمر (3):
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عنوان المؤتمر:
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8th Saudi Students’ Conference
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تاريخ الإنعقاد:
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31/01/2015
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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 Single Leg Hop Distances and Various Tests of Strength Production
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ملخص المشاركة:
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Background:
Lower extremity
muscular strength is often assumed to reflect and affect hop test scores. It
has been reported in the literature that there is a positive relationship
between isokinetic muscle strength and performance in single-leg hop tests
(Barber et al., 1990; Noyes et al., 1991; Wilk et al., 1994). Although hop
tests are considered to be reliable functional tests, especially in
weight-bearing activities, some participants may not be able to perform these
tests after injury. It has been found that 40 per cent of non-copers, who
were not able to return to normal activity, were unwilling to perform and
complete the hop tests for time and distance, fearing that injury or pain
would occur/recur (Rudolph et al., 2000). However, there is lack of
literature exploring the relationship of lower limb muscles strength with hop
tests which might have a role in hop performance.
Design:
A correlation study.
Setting:
Undertaken in the
Human Performance Laboratory at the University of Salford.
Participants:
20 recreational
athletes, 11 males and 9 females, were recruited (age 33.65±3.47 years;
height 170.9±5.87 cm; and mass 81.05±15.93 kg).
Interventions:
Two different tests
have been taken on the right leg:
1- Horizontal hop
for distance test.
2- Isokinetic
muscle strength tests: quadriceps muscle test, hamstring muscle test, ankle
plantar flexors muscle test, and hip extensors muscle test. All of these
tests have been applied in both concentric and eccentric muscle actions.
Main Outcome
Measurements:
1- Hop test: maximum
distance when undertaking single hop for distance.
2- Isokinetic
muscle strength tests: there are three different variables which have been
collected: peak torque, peak torque to body weight, and the work to body
weight.
Results &
Conclusion:
Hip strength test
shows moderate significant correlation to the distance hopped whilst others
fail to show any association.
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المؤتمر (4):
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عنوان المؤتمر:
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The International
Symposium of Sports Science, Engineering and Technology (ISSSET 2015)
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تاريخ الإنعقاد:
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10/05/2015
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مكان
الإنعقاد:
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Istanbul, Turkey
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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 Hop Performance and Various Tests of Force Production in Anterior
Cruciate Ligament Reconstructed (ACLR) Patients
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ملخص المشاركة:
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Background:
Muscular power has
been considered as one of the essential elements of dynamic athletic
performance, especially in sporting activities that involve high force
generation in a short period of time (Newton and Kraemer, 1994). Moreover,
jumping is a complex movement that needs complex motor coordination between
upper and lower segments of the body (Markovic et al., 2004). Especially, the
propulsive action during a vertical jump from the lower limbs has been
considered mainly suited for examining explosive characteristics of sedentary
persons and elite athletes (Bosco and Komi, 1979; Bosco and Viitasalo, 1982).
Force time characteristics during the isometric mid-thigh pull have been
shown to relate to performance in athletic tasks, although no associations
have been made with screening tasks, such as hop performance. However, overall there is lack of
literature exploring the relationship of lower limb force production with hop
tests which provide an explanation of hop performance deficits or otherwise
for an ACL reconstructed patient which might be seen as a possible risk
factor for re-injury.
Design:
A correlation study.
Setting:
Undertaken in the
Human Performance Laboratory at the University of Salford.
Participants:
16 ACL reconstructed
(6-9 post-operative) patients, 9 males and 7 females, were recruited (age
22.31 ± 3.37 years; height 179 ± 9.71 cm; and mass 78.31 ± 11.83 kg).
Interventions:
Two different tests
have been undertaken on both legs:
3- Hop tests,
which include horizontal hop for distance and crossover hop tests.
4- Force tests,
which include ten consecutive jumps, and the unilateral stance isometric
mid-thigh pull (IMTP).
Main Outcome
Measurements:
3- Hop test:
maximum distance when undertaking single/crossover hop for distance.
4- Force tests:
six variables for ten jumps which are: maximum rate of force development
(RFD), peak force, peak power, peak velocity, time to peak force, and time to
peak power. While six different variables for IMPT which are: maximum RFD,
peak force, impulse 0-100ms, impulse 0-200ms, impulse 0-250ms, and impulse
0-300ms.
Results &
Conclusion:
Peak force during the
10 jump test appears to be the most consistent predictor of hop performances
across injured leg (Table 1). Interestingly impulse measures, from 0-100, 0-200,
0-250 ms, were inversely correlated with hop performance during the IMTP for
the injured leg, which highlights potential problems with using isometric
assessment of force time characteristics, to predict dynamic hop performances
for ACL injured limbs.
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المؤتمر (5):
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عنوان المؤتمر:
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The ANNUAL CONGRESS
ON SPORTS MEDICINE 2016
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تاريخ الإنعقاد:
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04/02/2016
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مكان
الإنعقاد:
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Kolding, Denmark
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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 Hop Test Performance and 2-D Frontal Plan Projection Angle (FPPA)
During Standard Screening Tests
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ملخص المشاركة:
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Introduction:
Single-leg squat
(SLS), horizontal single-leg hop landing (SLHL), and crossover hop are used
by physiotherapists in order to evaluate and screen for lower extremity
function. Knee valgus angle has been associated with anterior cruciate
ligament (ACL) injuries, and has been considered as one of the possible
factors for noncontact ACL injuries. Knee valgus misalignment has been
reported as a common postural dysfunction in the lower extremity during
weight bearing exercises, such as SLS and SLHL. Therefore, the aim of this
study is to investigate the association between different FPPA tests using
2-D system and hop performance in healthy participants.
Material and Method:
Participants: 20
Recreational athletes, 11 males and 9 females, were recruited (age 33.65±3.47
years; height 170.9±5.87 cm; and mass 81.05±15.93 kg). Methods: Two different
tests were undertaken on both legs individually, (1) Hop tests: horizontal
single-leg & crossover hop for distance tests. (2) FPPA: from two
different tasks which are hop landing and squatting. Outcome Measures: (1)
Hop tests: maximum distance when undertaking single/crossover hop. (2) FPPA:
peak knee valgus angles were measured from the maximum knee flexion position.
Results:
Moderate significant
negative correlations found between FPPA during single leg squat and
horizontal single-leg hop distance in dominant limb (r = -.339, p = .041),
and non-dominant limb (r = -.418, p = .027). No significant differences were
found between FPPA tests and crossover hop distance test.
Conclusion:
Moderate significant
negative correlations found between FPPA during single leg squat and
horizontal single-leg hop distance in both dominant and non-dominant limbs.
Meaning that the less knee valgus angle during single-leg squat the greater
the hop performance
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المؤتمر (6):
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عنوان المؤتمر:
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European College of
Sport Science (ECSS) in Vienna 2016
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تاريخ الإنعقاد:
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06/07/2016
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مكان
الإنعقاد:
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Vienna. Austria
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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 Force Generation and Strength Production in Anterior
Cruciate Ligament Reconstructed (ACLR) Patients
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ملخص المشاركة:
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Background:
Muscular power has
been considered as one of the essential elements of dynamic athletic
performance, especially in sporting occasions that involve high force
generation in a short period of time (1). Moreover, Lower extremity muscular
strength is often assumed to reflect and affect overall performance. One
example of this is that there is a positive relationship between isokinetic
muscle strength and hop performance during single-leg hop tests (2). However,
there is lack of literature exploring the relationship of lower limb force
generation with muscles strength tests which might have a role in overall
performance. This will inform the specialists about what are the suitable
tests should be used to explain lower limb function. Therefore, the aim of
this study is to investigate the association between lower limb force
generation tests using FT 700 and knee muscles strength test (quadriceps
& hamstring) using Biodex System 4 in ACLR patients.
Design & Setting:
A correlation study
undertaken in the Human Performance Laboratory at the University of Salford.
Participants:
16 ACL reconstructed
(6-9 post-operative) patients, 9 males and 7 females, were recruited (age
22.31 ± 3.37 years; height 179 ± 9.71 cm; and mass 78.31 ± 11.83 kg).
Interventions:
Two different tests
have been undertaken on both legs (injured & non-injured):
1-Force tests:
include ten consecutive vertical jumps and the unilateral stance isometric
mid-thigh pull (IMTP).
2-Isokinetic muscle
strength tests: of quadriceps and hamstring muscle testing. All of strength
tests were performed in concentric muscle action only.
Main Outcome
Measurements:
1-Force tests: six
variables (in concentric phase) for ten jumps test which were: maximum rate
of force development (RFD), peak force, peak power, peak velocity, time to
peak force, and time to peak power. While six other variables (in concentric
phase) for IMTP test which were: maximum RFD, peak force, impulse 0-100ms,
impulse 0-200ms, impulse 0-250ms, and impulse 0-300ms. All force tests were
undertaken using FT 700.
2-Isokinetic muscle
strength tests: three different variables were collected in concentric phase,
peak torque, peak torque to body weight, and the total work to body weight
using Biodex System 4.
Results &
Conclusion:
The majority of quadriceps
strength parameters relate to peak force during 10 jumps test. Hamstring
strength would appear to relate to peak force, peak velocity, time to peak
force, and time to peak power during 10 jumps test. Strength in both
quadriceps and hamstring does not appear to correlate to any force parameters
during isometric mid-thigh pull test for either injured and non-injured
limbs.
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جوائز التكريم:
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الجائزة (1):
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مسمى الجائزة:
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The Best
Poster Presentation
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الجهة المانحة:
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The
scientific committee of the International Symposium of Sports Science,
Engineering and Technology (ISSSET 2015)
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تاريخ الجائزة:
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13/05/2015
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مجال التكريم:
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The
Association Between Hop Performance and Various Tests of Force Production in
Anterior Cruciate Ligament Reconstructed (ACLR) Patients
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الجائزة (2):
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مسمى الجائزة:
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1st Prize in the Poster Competition (SPARC) 2016
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الجهة المانحة:
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The Salford Postgraduate Annual Research Conference (SPARC) 2016 committee
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تاريخ الجائزة:
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15/06/2016
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مجال التكريم:
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1st Prize in the Poster Competition (SPARC) 2016 for the poster entitled: “The Association Between Hop Performance and Various Tests of Strength Production
in Anterior Cruciate Ligament Reconstructed (ACLR) Patients”
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