Effect of fatigue on stride pattern continuously measured by an accelerometric gait recorder in middle distance runners

Autor:	Le Bris, R., Billat, V., Auvinet, B., Chaleil, D., Laurence Hamard, Barrey, E.
Přispěvatelé:	Station de Génétique Quantitative et Appliquée (SGQA), Institut National de la Recherche Agronomique (INRA)
Předmět:	Adult Male Respiration [SDV]Life Sciences [q-bio] Acceleration Body Weight LOCOMOTION FATIGUE Biomechanical Phenomena Running BIOMECANICS BIOMECANIQUE Oxygen Consumption Lower Extremity Heart Rate Physical Endurance Humans Telemetry Lactic Acid Gait ComputingMilieux_MISCELLANEOUS
Zdroj:	Europe PubMed Central Scopus-Elsevier Journal of Sports Medicine and Physical Fitness Journal of Sports Medicine and Physical Fitness, Edizione Minerva Medica, 2006, 46, pp.227-231
ISSN:	0022-4707
Popis:	The purpose of this study was to analyze the continuous changes in stride patterns of athletes running at speed elicited VO(2max).Six male sub-elite middle-distance runners carried out a constant track running test to exhaustion (time to exhaustion: 409+/-71 s) at their maximal aerobic speed (17.4+/-1.1 km.h(-1)). The body accelerations were measured with a triaxial accelerometer fixed at the low back. A set of variables was computed from the accelerometer output: stride frequency, stride symmetry and regularity, signal energies and impulses in each axis and the integral of the total acceleration vector. An ANOVA with repeated measures was performed to test the changes of these variables during the three times: the onset point, midway point and end point of exercise.The following changes were observed: the regularity index which describes the similarity of crania-caudal movements over successive strides, decreased significantly between the start and the end of the test (309.9 to 274.5; P0.05). During the same time, the media-lateral impulse (4.69%BW.s to 5.71%BW.s; P0.001; BW: body weight) and signal energy (1.40 G(2).s to 2.06 G(2).s; P0.001; G=9.81 m.s(-2)) increased significantly.The changes in medio-lateral axis (increase of energy expenditure which is not useful for propulsion) and in the regularity index (modifications in the temporal-spatial periodicity of the running cycle) could be considered as early alterations of running pattern when the athletes got fatigued.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid_dedup__::dfc8a1e3aa2f00c1d940056d0b950861 http://europepmc.org/abstract/med/16823352 Zobrazit plný text záznamu