Abstract：
UNASSIGNED: The influence of external workload variables on the development of calf muscle strainsin football players has not been previously explored.
UNASSIGNED: Overloaded players would have an increased risk of calf muscle strain injury.
UNASSIGNED: Prospective observational study.
UNASSIGNED: Level 4.
UNASSIGNED: A total of 41 professional football players from 1 team were monitored for 2 consecutive seasons. Total distance covered (TD), and distances covered at high-intensity running, high sprint running, low (LACC) and high (HACC) acceleration, low (LDEC) and high (HDEC) deceleration, and at high metabolic load distance (HMLD) were monitored with GPS units. Accumulated players\' external workload in the week before injury was compared with the weekly mean value of the 6 weeks before injury occurred for each player.
UNASSIGNED: Ten players (24.3%) suffered 16 calf muscle strain injuries (3.1 injuries per 1000 hours of match play; 0.5 injuries per 1000 hours of training exposure). Players with a calf muscle injury were older (p = 0.03), with higher body weight (p = 0.01) and height (p = 0.03). Injured players displayed substantially higher total training volume (p < 0.01), TD (p < 0.01), LACC (p < 0.01), LDEC (p < 0.01), HACC (p < 0.01), HDEC (p < 0.01), and HMLD (p = 0.03) in the week before injury, in comparison with the mean values of these variables in the 6 weeks before injury.
UNASSIGNED: A week with a higher-than-habitual external workload might increase the risk of calf muscle strain injury in professional football players. Calf muscle injuries were preceded by a week with unusually high workloads associated with accelerating and decelerating distances and higher training volumes.
UNASSIGNED: Monitoring external workload indicators may be helpful in determine players with a higher risk of calf muscle strain injury due to excessive workload during training/competition.
UNASSIGNED: Overloaded players would have an increased risk of calf muscle strain injury.
UNASSIGNED: Prospective observational study.
UNASSIGNED: Level 4.
UNASSIGNED: A total of 41 professional football players from 1 team were monitored for 2 consecutive seasons. Total distance covered (TD), and distances covered at high-intensity running, high sprint running, low (LACC) and high (HACC) acceleration, low (LDEC) and high (HDEC) deceleration, and at high metabolic load distance (HMLD) were monitored with GPS units. Accumulated players\' external workload in the week before injury was compared with the weekly mean value of the 6 weeks before injury occurred for each player.
UNASSIGNED: Ten players (24.3%) suffered 16 calf muscle strain injuries (3.1 injuries per 1000 hours of match play; 0.5 injuries per 1000 hours of training exposure). Players with a calf muscle injury were older (p = 0.03), with higher body weight (p = 0.01) and height (p = 0.03). Injured players displayed substantially higher total training volume (p < 0.01), TD (p < 0.01), LACC (p < 0.01), LDEC (p < 0.01), HACC (p < 0.01), HDEC (p < 0.01), and HMLD (p = 0.03) in the week before injury, in comparison with the mean values of these variables in the 6 weeks before injury.
UNASSIGNED: A week with a higher-than-habitual external workload might increase the risk of calf muscle strain injury in professional football players. Calf muscle injuries were preceded by a week with unusually high workloads associated with accelerating and decelerating distances and higher training volumes.
UNASSIGNED: Monitoring external workload indicators may be helpful in determine players with a higher risk of calf muscle strain injury due to excessive workload during training/competition.
摘要：
■以前尚未探索过外部工作量变量对足球运动员小腿肌肉紧张发展的影响。
■过载的球员会增加小腿肌肉拉伤的风险。
■前瞻性观察性研究。
■4级。
■连续两个赛季对1支球队的41名职业足球运动员进行了监测。总覆盖距离(TD),以及高强度跑步所覆盖的距离，高冲刺跑，低（LACC）和高（HACC）加速度，低（LDEC）和高（HDEC）减速，并在高代谢负荷距离（HMLD）用GPS单位监测。将受伤前一周累积的球员外部工作量与每个球员受伤前6周的每周平均值进行比较。
■10名球员（24.3％）遭受了16次小腿肌肉拉伤（每1000小时的比赛中有3.1次受伤；每1000小时的训练暴露中有0.5次受伤）。小腿肌肉损伤的球员年龄较大（p=0.03），具有较高的体重（p=0.01）和身高（p=0.03）。受伤的球员表现出更高的总训练量（p<0.01），TD（p<0.01），LACC（p<0.01），LDEC（p<0.01），HACC（p<0.01），HDEC（p<0.01），受伤前一周的HMLD（p=0.03），与受伤前6周这些变量的平均值进行比较。
■外部工作量高于习惯性的一周可能会增加职业足球运动员小腿肌肉拉伤的风险。小腿肌肉受伤之前一周，工作量异常高，与加速和减速距离以及更高的训练量相关。
■监视外部工作量指标可能有助于确定由于训练/比赛中过多的工作量而导致小腿肌肉拉伤风险较高的球员。
■过载的球员会增加小腿肌肉拉伤的风险。
■前瞻性观察性研究。
■4级。
■连续两个赛季对1支球队的41名职业足球运动员进行了监测。总覆盖距离(TD),以及高强度跑步所覆盖的距离，高冲刺跑，低（LACC）和高（HACC）加速度，低（LDEC）和高（HDEC）减速，并在高代谢负荷距离（HMLD）用GPS单位监测。将受伤前一周累积的球员外部工作量与每个球员受伤前6周的每周平均值进行比较。
■10名球员（24.3％）遭受了16次小腿肌肉拉伤（每1000小时的比赛中有3.1次受伤；每1000小时的训练暴露中有0.5次受伤）。小腿肌肉损伤的球员年龄较大（p=0.03），具有较高的体重（p=0.01）和身高（p=0.03）。受伤的球员表现出更高的总训练量（p<0.01），TD（p<0.01），LACC（p<0.01），LDEC（p<0.01），HACC（p<0.01），HDEC（p<0.01），受伤前一周的HMLD（p=0.03），与受伤前6周这些变量的平均值进行比较。
■外部工作量高于习惯性的一周可能会增加职业足球运动员小腿肌肉拉伤的风险。小腿肌肉受伤之前一周，工作量异常高，与加速和减速距离以及更高的训练量相关。
■监视外部工作量指标可能有助于确定由于训练/比赛中过多的工作量而导致小腿肌肉拉伤风险较高的球员。
