Routledge Harry E, Leckey Jill J, Lee Matt J, Garnham Andrew, Graham Stuart, Burgess Darren, Burke Louise M, Erskine Robert M, Close Graeme L, Morton James P
Int J Sports Physiol Perform. 2019 Jan 1;14(1):122-124. doi: 10.1123/ijspp.2018-0106.
To better understand the carbohydrate (CHO) requirement of Australian Football (AF) match play by quantifying muscle glycogen utilization during an in-season AF match.
After a 24-h CHO-loading protocol of 8 and 2 g/kg in the prematch meal, 2 elite male forward players had biopsies sampled from m. vastus lateralis before and after participation in a South Australian Football League game. Player A (87.2 kg) consumed water only during match play, whereas player B (87.6 kg) consumed 88 g CHO via CHO gels. External load was quantified using global positioning system technology.
Player A completed more minutes on the ground (115 vs 98 min) and covered greater total distance (12.2 vs 11.2 km) than player B, although with similar high-speed running (837 vs 1070 m) and sprinting (135 vs 138 m). Muscle glycogen decreased by 66% in player A (pre: 656 mmol/kg dry weight [dw], post: 223 mmol/kg dw) and 24% in player B (pre: 544 mmol/kg dw, post: 416 mmol/kg dw).
Prematch CHO loading elevated muscle glycogen concentrations (ie, >500 mmol/kg dw), the magnitude of which appears sufficient to meet the metabolic demands of elite AF match play. The glycogen cost of AF match play may be greater than in soccer and rugby, and CHO feeding may also spare muscle glycogen use. Further studies using larger sample sizes are now required to quantify the interindividual variability of glycogen cost of match play (including muscle and fiber-type-specific responses), as well examining potential metabolic and ergogenic effects of CHO feeding.
通过量化赛季中澳大利亚式足球（AF）比赛期间肌肉糖原的利用情况，更好地了解AF比赛对碳水化合物（CHO）的需求。
在赛前餐中采用8克/千克和2克/千克的24小时CHO负荷方案后，2名精英男性前锋球员在参加南澳大利亚足球联赛比赛前后，从股外侧肌进行活检取样。球员A（87.2千克）在比赛期间只饮水，而球员B（87.6千克）通过CHO凝胶摄入88克CHO。使用全球定位系统技术对外部负荷进行量化。
球员A在场上的时间更长（115分钟对98分钟），总跑动距离更远（12.2千米对11.2千米），尽管高速奔跑距离（837米对1070米）和冲刺距离（135米对138米）相似。球员A的肌肉糖原下降了66%（赛前：656毫摩尔/千克干重[dw]，赛后：223毫摩尔/千克dw），球员B下降了24%（赛前：544毫摩尔/千克dw，赛后：416毫摩尔/千克dw）。
赛前CHO负荷提高了肌肉糖原浓度（即>500毫摩尔/千克dw），其幅度似乎足以满足精英AF比赛的代谢需求。AF比赛的糖原消耗可能比足球和橄榄球更大，CHO摄入也可能节省肌肉糖原的使用。现在需要进一步开展更大样本量的研究，以量化比赛中糖原消耗的个体间差异（包括肌肉和纤维类型特异性反应），并研究CHO摄入的潜在代谢和促力效应。
