Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2016) 15, 277 - 286

Research article
Alterations of Vertical Jump Mechanics after a Half-Marathon Mountain Running Race
Elissavet N. Rousanoglou1, , Konstantinos Noutsos2, Achilleas Pappas1, Gregory Bogdanis3, Georgios Vagenas4, Ioannis A. Bayios2, Konstantinos D. Boudolos1
Author Information
1 Sport Biomechanics Laboratory, Department of Sport Medicine & Biology of Exercise, School of Physical Education & Sport Science, National & Kapodistrian University of Athens, Greece
2 Department of Sport Games, School of Physical Education & Sport Science, National & Kapodistrian University of Athens, Greece
3 Department of Track & Field, School of Physical Education & Sport Science, National & Kapodistrian University of Athens, Greece
4 Statistics Laboratory Department of Theoretical Studies, School of Physical Education & Sport Science, National & Kapodistrian University of Athens, Greece

Elissavet N. Rousanoglou
✉ National & Kapodistrian University of Athens, School of Physical Education & Sport Science, Ethnikis Antistasis 41, Daphne, 17237, Athens, Greece
Email: erousan@phed.uoa.gr
Publish Date
Received: 15-02-2016
Accepted: 16-03-2016
Published (online): 23-05-2016
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ABSTRACT

The fatiguing effect of long-distance running has been examined in the context of a variety of parameters. However, there is scarcity of data regarding its effect on the vertical jump mechanics. The purpose of this study was to investigate the alterations of countermovement jump (CMJ) mechanics after a half-marathon mountain race. Twenty-seven runners performed CMJs before the race (Pre), immediately after the race (Post 1) and five minutes after Post 1 (Post 2). Instantaneous and ensemble-average analysis focused on jump height and, the maximum peaks and time-to-maximum peaks of: Displacement, vertical force (Fz), anterior-posterior force (Fx), Velocity and Power, in the eccentric (tECC) and concentric (tCON) phase of the jump, respectively. Repeated measures ANOVAs were used for statistical analysis (p ≤ 0.05). The jump height decrease was significant in Post 2 (-7.9%) but not in Post 1 (-4.1%). Fx and Velocity decreased significantly in both Post 1 (only in tECC) and Post 2 (both tECC and tCON). Α timing shift of the Fz peaks (earlier during tECC and later during tCON) and altered relative peak times (only in tECC) were also observed. Ensemble-average analysis revealed several time intervals of significant post-race alterations and a timing shift in the Fz-Velocity loop. An overall trend of lowered post-race jump output and mechanics was characterised by altered jump timing, restricted anterior-posterior movement and altered force-velocity relations. The specificity of mountain running fatigue to eccentric muscle work, appears to be reflected in the different time order of the post-race reductions, with the eccentric phase reductions preceding those of the concentric one. Thus, those who engage in mountain running should particularly consider downhill training to optimise eccentric muscular action.

Key words: Countermovement jump, post-activation potentiation, force-velocity relationship, ensemble-average mechanics


           Key Points
  • The 4.1% reduction of jump height immediately after the race is not statistically significant
  • The eccentric phase alterations of jump mechanics precede those of the concentric ones.
  • Force-velocity alterations present a timing shift rather than a change in force or velocity magnitude.
 
 
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