Data di Pubblicazione:
2009
Citazione:
Effect of K1 Fight on vertical jump, reaction time, and lactate production / G. Cimadoro, G. Alberti, N. Babault - In: Book of Abstracts of the 14th Annual Congress of the European College of Sport Science / [a cura di] S.B.K. Loland, K. Fasting, J. Hallèn, Y. Ommundsen, G. Roberts, E. Tsolakidis. - [s.l] : Norvegian School of Sport Sciences, 2009 Jun. - ISBN 978-82-502-0420-1. - pp. 345-345 (( Intervento presentato al 14. convegno Annual Congress of the European College of Sport Science : Sport Sciences, Nature, Nurture and Culture tenutosi a Oslo nel 2009.
Abstract:
Introduction: K1 is a combat sport with punches, kicks and knee blows. Two parameters may influence athletes’ performance: injuries
(e.g., Zazryn et al., 2003) and fatigue. Some studies were conducted to determine fighters physiological profile such as VO2max (Gosh et
al., 1995; Guidetti et al., 2002). However, the effects of fatigue during official K1 fights remain unknown. Therefore, the aim of this study
was to determine the effects of fatigue induced by an official K1 fight on vertical jump, simple visual reaction time, lactate accumulation
and tactical behaviors.
Methods: Eight male volunteers were recruited during regional Italian K1-style amateur competition. Mean (± SD) age, height, weight and
training experience were 24.3 ± 1.8 yrs, 173.8 ± 5.6 cm, 73.3 ± 9.4 kg, 5.6 ± 2.2 yrs, respectively. Subjects performed three rounds of 90 s
with 60 s rest among rounds. Tests included counter movement jumps, simple visual reaction time (both were measured with an optojump
system, Microgate, Italy) and blood lactate (Lactate PRO). They were performed before warm-up and after fights. Vertical jumps and
simple visual reaction times were determined 8 minutes after the end of the third round due to judge’s decision and prize giving. Blood
lactate was collected 2 minutes after the end of the fight. A complete match-analysis was also made using a camcorder (blow numbers).
Results: Match-analysis showed 86 ± 23 total blows. No difference was found among rounds. However, punches (39 ± 16) and kicks (37
± 16) number during fights was bigger (p<0.001) than knees (10 ± 10). While no difference among rounds was found for punches and
kicks, knee blows were greater during the third round regarding with the first and second round (+4.8 ± 4.1, 2.8 ± 3.2, 2.4 ± 3.6, respectively,
p<0.05). After the end of the fights, blood lactate was found to be on average 15.3 ± 1.6 mmol/L. Simple reaction times significant
increased (+7.8 ± 5.6%; p<0.01) and no difference was found in vertical jump heights.
Discussion: Our data showed an altered number of blows among rounds. The increased knee blow number may be due to either or
both tactical behaviors and technical economy. High values of blood lactate suggested a key role of anaerobic metabolism in K1 fights.
Although high lactate values, vertical jump heights were surprisingly unchanged, this may be due to long rest duration between the end
of the fights and post-tests. After the fight, simple visual reaction time
Tipologia IRIS:
03 - Contributo in volume
Elenco autori:
G. Cimadoro, G. Alberti, N. Babault
Link alla scheda completa:
Titolo del libro:
Book of Abstracts of the 14th Annual Congress of the European College of Sport Science