TY  - JOUR
AU  - Fourchet, François
A2  - Fourchet, François
A2  - Kelly, Luke
A2  - Horobeanu, Cosmin
A2  - Loepelt, Heiko
A2  - Taïar, Redha
A2  - Millet, Grégoire
DB  - BISp
DP  - BISp
KW  - Analyse
KW  - Belastung, erschöpfende
KW  - Biomechanik
KW  - Druckverteilung
KW  - Ermüdung
KW  - Erschöpfung
KW  - Fußknöchel
KW  - Fußsohle
KW  - Jugendlicher
KW  - Krafttraining, isokinetisches
KW  - Laufen
KW  - Muskeltraining, isokinetisches
KW  - Plantarflexion
KW  - Pronation
KW  - Sportmedizin
KW  - Sportwissenschaft
KW  - Sprunggelenk
KW  - Sprunggelenk, oberes
KW  - Sprunggelenk, unteres
KW  - Untersuchung, vergleichende
LA  - eng
TI  - High-intensity running and plantar-flexor fatigability and plantar-pressure distribution in adolescent runners
TT  - Hochintensives Laufen und die Ermüdung der Fußsohlenmuskulatur und Druckverteilung unter der Fußsohle bei jugendlichen Läufern
PY  - 2015
N2  - Context: Fatigue-induced alterations in foot mechanics may lead to structural overload and injury. Objectives: To investigate how a high-intensity running exercise to exhaustion modifies ankle plantar-flexor and dorsiflexor strength and fatigability, as well as plantar-pressure distribution in adolescent runners. Design: Controlled laboratory study. Setting: Academy research laboratory. Patients or Other Participants: Eleven male adolescent distance runners (age = 16.9 ± 2.0 years, height = 170.6 ± 10.9 cm, mass = 54.6 ± 8.6 kg) were tested. Intervention(s): All participants performed an exhausting run on a treadmill. An isokinetic plantar-flexor and dorsiflexor maximal-strength test and a fatigue test were performed before and after the exhausting run. Plantar-pressure distribution was assessed at the beginning and end of the exhausting run. Main Outcome Measure(s): We recorded plantar-flexor and dorsiflexor peak torques and calculated the fatigue index. Plantar-pressure measurements were recorded 1 minute after the start of the run and before exhaustion. Plantar variables (ie, mean area, contact time, mean pressure, relative load) were determined for 9 selected regions. Results: Isokinetic peak torques were similar before and after the run in both muscle groups, whereas the fatigue index increased in plantar flexion (28.1%; P = .01) but not in dorsiflexion. For the whole foot, mean pressure decreased from 1 minute to the end (−3.4%; P = .003); however, mean area (9.5%; P = .005) and relative load (7.2%; P = .009) increased under the medial midfoot, and contact time increased under the central forefoot (8.3%; P = .01) and the lesser toes (8.9%; P = .008). Conclusions: Fatigue resistance in the plantar flexors declined after a high-intensity running bout performed by adolescent male distance runners. This phenomenon was associated with increased loading under the medial arch in the fatigued state but without any excessive pronation. Verf.-Referat
L2  - http://natajournals.org/doi/full/10.4085/1062-6050-49.3.90
L2  - https://dx.doi.org/10.4085/1062-6050-49.3.90
DO  - 10.4085/1062-6050-49.3.90
SP  - S. 117-125
SN  - 1062-6050
JO  - Journal of athletic training
IS  - 2
VL  - 50
M3  - Elektronische Ressource (online)
M3  - Gedruckte Ressource
ID  - PU201504002930
ER  -