Effect of fatigue on force production and force application technique during repeated sprints

JOURNAL OF BIOMECHANICS

卷:44

Article

Morin, Jean-Benoit^1,3  Samozino, Pierre^1,3  Edouard, Pascal^1,3  Tomazin, Katja^1,2,3 

[1] Univ Lyon, F-42023 St Etienne, France

[2] Univ Ljubljana, Fac Sport, Ljubljana, Slovenia

[3] Lab Exercise Physiol EA4338, F-42000 St Etienne, France

关键词: Fatigue;    Performance;    Supra-maximal exercise;    Acceleration;    Power output;   

DOI  :  10.1016/j.jbiomech.2011.07.020

来源: Elsevier

【 摘 要 】

We investigated the changes in the technical ability of force application/orientation against the ground vs. the physical capability of total force production after a multiple-set repeated sprints series. Twelve male physical education students familiar with sprint running performed four sets of five 6-s sprints (24 s of passive rest between sprints, 3 min between sets). Sprints were performed from a standing start on an instrumented treadmill, allowing the computation of vertical (F-V), net horizontal (F-H) and total (F-Tot) ground reaction forces for each step. Furthermore, the ratio of forces was calculated as RF=FHFTot-1, and the index of force application technique (D-RF) representing the decrement in RF with increase in speed was computed as the slope of the linear RF-speed relationship. Changes between pre-(first two sprints) and post-fatigue (last two sprints) were tested using paired t-tests. Performance decreased significantly (e.g. top speed decreased by 15.7 +/- 5.4%; P < 0.001), and all the mechanical variables tested significantly changed. F-H showed the largest decrease, compared to F-V and F-Tot. D-RF significantly decreased (P < 0.001, effect size = 1.20), and the individual magnitudes of change of D-RF were significantly more important than those of F-Tot (19.2 +/- 20.9 vs. 5.81 +/- 5.76%, respectively; P < 0.01). During a multiple-set repeated sprint series, both the total force production capability and the technical ability to apply force effectively against the ground are altered, the latter to a larger extent than the former. (C) 2011 Elsevier Ltd. All rights reserved.

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