Forearm wearable resistance effects on sprint kinematics and kinetics
Objectives: Arm swing is a distinctive characteristic of sprint-running with the arms working in a contralateral manner with the legs to propel the body in a horizontal direction. The purpose of this study was to determine the acute changes in kinematics and kinetics when wearable resistance (WR) of 1 kg (equivalent to ~1% body mass) was attached to each forearm during over ground short distance (20 m) maximal sprint-running.
Design: Cross-sectional study.
Methods: Twenty-two male amateur rugby athletes (19.4 ± 0.5 years; 97.0 ± 4.8 kg; 180.4 ± 7.2 cm) volunteered to participate in the study. Radar and Optojump were used to examine kinematic and kinetics between WR and unloaded sprint-running conditions.
Results: No significant (p < 0.05) differences were found at 2 m or 5 m between conditions, however, the WR condition resulted in a significant increase in 10 m, 20 m and 10-20 m split time (all, ~2%, small effect size) compared to the unloaded condition. Significant decreases were also found in theoretical maximum velocity (V0) (-1.4%, small effect size) and relative peak horizontal power production (Pmax) (-5.5%, small effect size). Step length (2.1%, small effect size) and contact time (6.5%, medium effect size) were significantly increased, while step frequency (-4.1%, small effect size) and flight time (-5.3%, medium effect size) were significantly decreased.
Conclusions: WR forearm loading provides a movement specific overload of the arms which significantly alters step kinematics and sprint times =10 m. ABSTRACT FROM AUTHOR
© Copyright 2019 Journal of Science and Medicine in Sport. Elsevier. Kaikki oikeudet pidätetään.
Aiheet: | sprintti yleisurheilu biomekaniikka tekniikka analyysi pikajuoksu nopeus liike |
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Aihealueet: | valmennusoppi voima ja nopeus urheilu |
Tagging: | Zusatzlast |
DOI: | 10.1016/j.jsams.2018.08.012 |
Julkaisussa: | Journal of Science and Medicine in Sport |
Julkaistu: |
2019
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Vuosikerta: | 22 |
Numero: | 3 |
Sivuja: | 348-352 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |