39526
2017
2017
eng
9
postprint
1
--
2017-05-04
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Trunk Muscle Activity during Drop Jump Performance in Adolescent Athletes with Back Pain
In the context of back pain, great emphasis has been placed on the importance of trunk stability, especially in situations requiring compensation of repetitive, intense loading induced during high-performance activities, e.g., jumping or landing. This study aims to evaluate trunk muscle activity during drop jump in adolescent athletes with back pain (BP) compared to athletes without back pain (NBP). Eleven adolescent athletes suffering back pain (BP: m/f: n = 4/7; 15.9 ± 1.3 y; 176 ± 11 cm; 68 ± 11 kg; 12.4 ± 10.5 h/we training) and 11 matched athletes without back pain (NBP: m/f: n = 4/7; 15.5 ± 1.3 y; 174 ± 7 cm; 67 ± 8 kg; 14.9 ± 9.5 h/we training) were evaluated. Subjects conducted 3 drop jumps onto a force plate (ground reaction force). Bilateral 12-lead SEMG (surface Electromyography) was applied to assess trunk muscle activity. Ground contact time [ms], maximum vertical jump force [N], jump time [ms] and the jump performance index [m/s] were calculated for drop jumps. SEMG amplitudes (RMS: root mean square [%]) for all 12 single muscles were normalized to MIVC (maximum isometric voluntary contraction) and analyzed in 4 time windows (100 ms pre- and 200 ms post-initial ground contact, 100 ms pre- and 200 ms post-landing) as outcome variables. In addition, muscles were grouped and analyzed in ventral and dorsal muscles, as well as straight and transverse trunk muscles. Drop jump ground reaction force variables did not differ between NBP and BP (p > 0.05). Mm obliquus externus and internus abdominis presented higher SEMG amplitudes (1.3–1.9-fold) for BP (p < 0.05). Mm rectus abdominis, erector spinae thoracic/lumbar and latissimus dorsi did not differ (p > 0.05). The muscle group analysis over the whole jumping cycle showed statistically significantly higher SEMG amplitudes for BP in the ventral (p = 0.031) and transverse muscles (p = 0.020) compared to NBP. Higher activity of transverse, but not straight, trunk muscles might indicate a specific compensation strategy to support trunk stability in athletes with back pain during drop jumps. Therefore, exercises favoring the transverse trunk muscles could be recommended for back pain treatment.
urn:nbn:de:kobv:517-opus4-395261
online registration
Universität Potsdam, Publikationsfonds
PA 2017_21
Frontiers in physiology (2017) Nr. 8:274. - DOI: 10.3389/fphys.2017.00274
<a href="http://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39525">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
CC-BY - Namensnennung 4.0 International
Steffen Müller
Josefine Stoll
Michael Cassel
Frank Mayer
Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
319
eng
uncontrolled
SEMG-pattern
eng
uncontrolled
back pain
eng
uncontrolled
drop jump
eng
uncontrolled
neuromuscular
eng
uncontrolled
performance
eng
uncontrolled
pre-activity
eng
uncontrolled
trunk
eng
uncontrolled
young athletes
Medizin und Gesundheit
open_access
Strukturbereich Kognitionswissenschaften
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/39526/phr_319_online.pdf
58760
2023
2023
eng
20
830
postprint
1
2023-04-12
2023-04-12
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Biomechanics and lower limb function are altered in athletes and runners with achilles tendinopathy compared with healthy controls: A systematic review
Achilles tendinopathy (AT) is a debilitating injury in athletes, especially for those engaged in repetitive stretch-shortening cycle activities. Clinical risk factors are numerous, but it has been suggested that altered biomechanics might be associated with AT. No systematic review has been conducted investigating these biomechanical alterations in specifically athletic populations. Therefore, the aim of this systematic review was to compare the lower-limb biomechanics of athletes with AT to athletically matched asymptomatic controls. Databases were searched for relevant studies investigating biomechanics during gait activities and other motor tasks such as hopping, isolated strength tasks, and reflex responses. Inclusion criteria for studies were an AT diagnosis in at least one group, cross-sectional or prospective data, at least one outcome comparing biomechanical data between an AT and healthy group, and athletic populations. Studies were excluded if patients had Achilles tendon rupture/surgery, participants reported injuries other than AT, and when only within-subject data was available.. Effect sizes (Cohen's d) with 95% confidence intervals were calculated for relevant outcomes. The initial search yielded 4,442 studies. After screening, twenty studies (775 total participants) were synthesised, reporting on a wide range of biomechanical outcomes. Females were under-represented and patients in the AT group were three years older on average. Biomechanical alterations were identified in some studies during running, hopping, jumping, strength tasks and reflex activity. Equally, several biomechanical variables studied were not associated with AT in included studies, indicating a conflicting picture. Kinematics in AT patients appeared to be altered in the lower limb, potentially indicating a pattern of “medial collapse”. Muscular activity of the calf and hips was different between groups, whereby AT patients exhibited greater calf electromyographic amplitudes despite lower plantar flexor strength. Overall, dynamic maximal strength of the plantar flexors, and isometric strength of the hips might be reduced in the AT group. This systematic review reports on several biomechanical alterations in athletes with AT. With further research, these factors could potentially form treatment targets for clinicians, although clinical approaches should take other contributing health factors into account. The studies included were of low quality, and currently no solid conclusions can be drawn.
Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
10.25932/publishup-58760
urn:nbn:de:kobv:517-opus4-587603
1866-8364
Version of record
Quarmby, Andrew
<a href="https://publishup.uni-potsdam.de/58761">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
CC-BY - Namensnennung 4.0 International
Andrew Quarmby
Jamal Mönnig
Hendrik Mugele
Jakob Henschke
MyoungHwee Kim
Michael Cassel
Tilman Engel
Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
830
eng
uncontrolled
achilles tendinopathy
eng
uncontrolled
biomechanics
eng
uncontrolled
neuromuscular
eng
uncontrolled
kinetics
eng
uncontrolled
electromyography
eng
uncontrolled
athletes
eng
uncontrolled
runners
eng
uncontrolled
kinematics
Sportarten, Sportspiele
open_access
Strukturbereich Kognitionswissenschaften
Referiert
Green Open-Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/58760/zhr830.pdf