Analyse des exigences physiques au football. Iñigo Mujika - PDF

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Analyse des exigences physiques au football Iñigo Mujika Contents Physiological characteristics of football match play Muscle glycogen depletion during football match play Position and game analysis technologies

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Analyse des exigences physiques au football Iñigo Mujika Contents Physiological characteristics of football match play Muscle glycogen depletion during football match play Position and game analysis technologies Examination of fatigue patterns in elite football The pioneers Physiological characteristics of football match play Distance covered during football match play Position Full-back Distance (km) Center-back Midfield Striker Hawley & Burke, Peak Performance, 1998 Activity pattern during football match-play Walk Activity pattern (activity, intensity and frequency) in football Activity Distance (m) 2150 Frequency Jog Cruise Sprint Back Total Tackles Headings 308 Reilly & Thomas, J. Hum. Mov. Stud. 2: 87-97, 1976 Physiological response during football match play Heart Rate (beats. min -1 ) 200 HR max * HR [La] blood * * * * * * * * * * Blood Lactate (mmol. l -1 ) Time (min) Ekblom, Sports. Med. 3: 50-60, 1986 Blood lactate and level of play Blood lactate (mmol. l -1 ) [La] blood 1 st Half [La] Blood 2 nd Half 2 1 st Division 2 nd Division 3 rd Division 4 th Division Ekblom, Sports. Med. 3: 50-60, 1986 Muscle lactate and ph during match play Krustrup et al., Med. Sci. Sports. Exerc. 38: , 2006 Substrate contribution and metabolic pathways g Muscle glycogen Anaeróbico % Aerobic Blood glucos Fat 20 0 Protein 0 Bangsbo, Acta Physiol. Scand. 619: 1-155, 1994 Muscle glycogen depletion during football match play Muscle glycogen depletion during football match-play Muscle glycogen (mmol. kg -1 d. m.) 100 Muscle glycogen (mmol. kg -1 d. m.) Distance covered (m): 1 st Half: nd Half: Distance covered (m): 1 st Half: nd Half: Start Half-time End Start Half-time End Saltin, Med. Sci. Sports. 5: , 1973 Muscle fiber glycogen depletion during match play Krustrup et al., Med. Sci. Sports. Exerc. 38: , 2006 Position and game analysis technologies Position and game analysis technologies The use of positioning and game analysis technologies has experienced a huge growth in recent years, and most professional football clubs use them for performance analysis purposes These technologies include: Radio Frequency Identification Ultra Wideband Global Position System Passive Tracking Bluetooth (Wireless Personal Area Network) Geographic Information System Cairos System Amisco ProZone Ascensio Trak Performance Inmotio GPSports MinimaxX BBC Piero Aspogamo - Automated Sport Game Analysis Model PaniniDigital Orad CyberSport RealTrack Football ZXY Sport Tracking Limitations Most of these systems lack proper scientific validation No studies are available comparing the results obtained by means of different game analysis methods No attempts have been made to correlate time-motion indices and physiological markers of fatigue during real match play Examination of fatigue patterns in elite football A multi-experimental approach Iñigo Mujika, Magni Mohr, Roberto Solano, Adam Hewitt, Asier Zubillaga Purpose To assess the concordance among four methods of match analysis during real match play in highly trained football players Video based time-motion analysis To examine fatigue development in football match play through time-motion analysis and physiological assessments Methods SAN MAMÉS STADIUM 94 minute match BILBAO ATHLETIC (Athletic Club Bilbao s 2nd Team) BASKONIA (Athletic Club Bilbao s 3rd Team) VS. Age: 20,3 1,1 yr Height: cm Mass: 73,9 5,8 kg Age: 18,5 0,5 yr Height: cm Mass: 75,9 7,1 kg Time-motion analysis Amisco system GPSports Catapult MinimaxX Video analysis Urinary specific gravity Fluid balance Heart rate Blood lactate Muscle temperature Repeated Jump and repeated sprint performance Results Concordance among match analysis methods Total distance, high-intensity running, sprinting Absolute values Total distance, high-intensity running, sprinting Relative values Results Fatigue development Total distance Mean Amisco, video, GPS Distance (m) 2000 * P 0.05 less than any other 15-min period * Time (min) High intensity running Mean Amisco, video, GPS Distance (m) P 0.05 more than any other 15-min period * P 0.05 less than any other 15-min period * Time (min) Sprinting Mean Amisco, video, GPS Distance (m) P 0.05 more than any other 15-min period * P 0.05 less than any other 15-min period * Time (min) Fluid balance (n = 18) Body mass (kg) Pre-Match Net fluid loss 1,5 l (2%BM) * P 0.05 lower than pre-match * Post-Match Heart Rate (n = 11) HR (b/min) 22.3 min 95%HR peak 14.6 min 95%HR peak Match Time (5-min Intervals) Mean 172 (89%HR peak ) Blood lactate (n = 18) Blood Lactate (mm) * * P 0.05 higher than pre-match * Pre-Match Post 1st Half Post 2nd Half Muscle temperature (n = 6) Temperature (ºC) P 0.05 higher than pre- and post-match * P 0.05 higher than rest * * Rest Pre-Match Post 1st Half Post 2nd Half Repeated jump performance (n = 11) Average Jump Height (cm) 41 * P 0.05 lower than pre-match * Pre-Match Post-Match Repeated sprint performance (n = 8) Mean Running Speed (m/s) 7.15 * P 0.05 lower than pre-match * Pre-Match Post-Match Yo-Yo IRT and fatigue resistance in high level football Mohr et al., Scand. J. Med. Sci. Sports 20 (Suppl. 3): , 2010 Conclusions Conclusions All four systems were able to detect performance decrements during a football game and can be applied to study development of fatigue in elite football Rather large bewteen-system differences were revealed in the determination of the absolute distance covered, implying that comparisons between systems should be done with caution Pronounced game-induced fatigue occurs in the final stage of a highlevel male soccer game played in a hot environment The ability to repeat intense exercise was highly compromised, and soccer-specific training status and the degree of dehydration play a role in this type of fatigue Randers et al., J. Sports Sci. 28: , 2010 Mohr et al., Scand. J. Med. Sci. Sports 20 (Suppl. 3): , 2010 The pioneers Tom Reilly Bob Withers Douglas Tumilty Georges Cazorla ESKERRIK ASKO! ( Merci Beaucoup! en Basque)
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