Cardio-respiratory and neuromuscular responses to motocross race

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Show simple item record Konttinen, Tomi 2008-01-10T12:28:46Z 2008-01-10T12:28:46Z 2005
dc.identifier.uri en
dc.description.abstract Tomi Konttinen. 2005. Cardio-respiratory and neuromuscular responses to motocrossrace. Department of Biology of Physical Activity. University of Jyväskylä. 37p.Objectives - The primary aim of the present study was to examine physiological andneuromuscular responses during motocross racing. Furthermore, maximal isometricforce levels of the upper and lower body were studied.Methods - Seven Finnish A-level (group A) and five hobby-class (group H)motocross-riders performed a 30 minute riding test at a motocross track and muscleforce and maximal oxygen uptake (VO2max) tests in a laboratory. Variablesdescribing cardio-respiratory strain were measured continuously during the riding andin the VO2max tests. Muscle activity using surface EMG recording was recordedduring the riding test and during the maximal isometric contractions.Results – During the race the mean VO2 reduced significantly in group A from 86 ± 10% to 69 ± 6 % of the maximum. In group H the reduction occurred from 94 ± 25 % to82 ± 20 %. The relative VO2 between the maximum and the riding test correlatedsignificantly with riding speed (r = 0.70, p < 0.01). Heart rate (HR) was maintainedcontinuously at the level of 97 ± 7 % of its maximum in group A and at 98 ± 3 % ingroup H. During the ride, the mean blood lactate concentration was 4.0 ± 1.0 mmol·l-1in group A but in group H it reduced from 5.7 ± 1.0 mmol·l-1 to 4.6 ± 0.7 mmol·l-1.Mean muscle activation of the lower body during riding varied between 24 – 38 % ofits maximum in group A and between 40 – 45 % in group H. The activation of theupper body muscles varied between 62 – 116 % in group A and 68 – 178 % in groupH of its maximum. The post-riding force measurements showed more significant(p<0,05) reductions in maximal voluntary contraction (MVC) of group H than MVCof group A. The absolute MVC measured before and after the riding experimentshowed greatest reductions in hand grip forces.Conclusions – Motocross causes great physical stress demanding on both skill andphysical capacity of the rider. Physical stress occurs due to handling of the bike whilereceiving continuous impacts, while muscle actions are both dynamic and isometricplacing demands in both aerobic and anaerobic metabolism. The data suggests thatboth the maximal capacity and the strain during the ride should be measured toanalyze the true physiological demands of motocross ride including the recording offorce levels before and after the ride to evaluate the neuromuscular fatigue due to therace. en
dc.format.extent 37 sivua
dc.language.iso eng
dc.rights This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. en
dc.rights Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. fi
dc.rights openAccess fi
dc.subject.other motocross en
dc.subject.other riding en
dc.subject.other physiological stress en
dc.subject.other neuromuscular stress en
dc.title Cardio-respiratory and neuromuscular responses to motocross race
dc.type Book en
dc.identifier.urn URN:NBN:fi:jyu-2005462
dc.subject.ysa moottoripyöräurheilu
dc.subject.ysa motocross
dc.subject.ysa hermo-lihastoiminta
dc.subject.ysa fyysinen kuormittavuus
dc.type.dcmitype Text en
dc.type.ontasot Pro gradu fi
dc.type.ontasot Master’s thesis en
dc.contributor.tiedekunta liikuntatieteellinen tiedekunta fi
dc.contributor.tiedekunta Faculty of Sport and Health Sciences en
dc.contributor.laitos liikuntabiologian laitos fi
dc.contributor.laitos Department of Biology of Physical Activity en
dc.contributor.yliopisto University of Jyväskylä en
dc.contributor.yliopisto Jyväskylän yliopisto fi

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