Players in the present study were able to repeat
an equivalent amount of high intensity running
in both the first and second halves. This provided
a contrast to previous elite European leagues
where high-intensity sprinting declined in the second
half.16 The elite Italian international players
examined by Mohr and colleagues16 commenced the
game working at much higher speeds than they finished,
as indicated by high intensity running in the
first 15 min when compared to the last 15 min. In our
study, the game intensity may not have been high
enough to deplete muscle glycogen stores significantly
and elicit a significant fatigue response, and
therefore high intensity running was maintained
throughout the match. Second half compromises
in our study were observed only in lower speed
movement perhaps suggesting players may selectively
spare energy for more crucial high intensity
efforts and reduce the incidence of less important
low intensity running.5 In effect, energy efficiency
or conservation of muscle glycogen may be a more
important characteristic than fatigue per se during
the second half game performances of elite players
in Australia. However, greater resting intervals
between the high-intensity efforts in the second
half would also facilitate the ability to repeat these
efforts later in the game, even in the face of physiological
fatigue. Given the possible advantage of
greater movement ability equating to greater game
involvement,17 this suggests the ability to prolong
fatigue as probably an important variable in elite
Australian performance. The interactive effects of
game tactics and fatigue, particularly in the second
half, remain unclear.
Players in the present study were able to repeatan equivalent amount of high intensity runningin both the first and second halves. This provideda contrast to previous elite European leagueswhere high-intensity sprinting declined in the secondhalf.16 The elite Italian international playersexamined by Mohr and colleagues16 commenced thegame working at much higher speeds than they finished,as indicated by high intensity running in thefirst 15 min when compared to the last 15 min. In ourstudy, the game intensity may not have been highenough to deplete muscle glycogen stores significantlyand elicit a significant fatigue response, andtherefore high intensity running was maintainedthroughout the match. Second half compromisesin our study were observed only in lower speedmovement perhaps suggesting players may selectivelyspare energy for more crucial high intensityefforts and reduce the incidence of less importantlow intensity running.5 In effect, energy efficiencyor conservation of muscle glycogen may be a moreimportant characteristic than fatigue per se duringthe second half game performances of elite playersin Australia. However, greater resting intervalsbetween the high-intensity efforts in the secondhalf would also facilitate the ability to repeat theseefforts later in the game, even in the face of physiologicalfatigue. Given the possible advantage ofgreater movement ability equating to greater gameinvolvement,17 this suggests the ability to prolong
fatigue as probably an important variable in elite
Australian performance. The interactive effects of
game tactics and fatigue, particularly in the second
half, remain unclear.
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