Constable P D, Hinchcliff K W, Farris J, Schmidt K E
Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana 61801, USA.
J Am Vet Med Assoc. 1996 Mar 15;208(6):879-82.
To determine whether selected factors were associated with finishing status in a long-distance sled dog race.
Prospective, observational study.
248 dogs participating in the 1994 Iditarod trail sled race that were members of 13 teams that finished the race. Dogs were not selected randomly, but were members of teams that were easily accessible for examination before the race. The proportion of teams that were examined that finished the race (14/17) was similar to the proportion of teams that were not examined that finished the race (36/41).
Age, sex, body conformation (weight, length, and thoracic width and circumference), cardiac variables (heart rate, natural logarithm of heart period variance, PR interval, QRS duration, QT index, R wave amplitude in leads II and V3, mean electrical axis, presence of cardiac arrhythmias suggestive of myocardial disease), and athletic ranking as assessed by the musher were compared between dogs that finished the race (n = 128) and dogs that did not finish (n = 120).
The only factor found to differ significantly (P < 0.05) between finishers and nonfinishers was athletic ranking as assessed by the musher. Athletic rank and QRS duration or QRS duration normalized for body weight were identified by means of logistic regression as variables associated (P < 0.15) with finishing status. There was a significant (P < 0.0001), but weak (R2 = 0.18), linear relationship between race time and mean QRS duration for each team.
Athletic ranking as assessed by the musher was the most important of the studied variables in determining finishing status, whereas age, sex, body conformation, and body weight were unimportant. Duration of the QRS was of minor importance in determining finishing status.
确定在一场长途雪橇犬比赛中，所选因素是否与完赛状态相关。
前瞻性观察研究。
248只参加1994年艾迪塔罗德小道雪橇犬比赛的犬，它们是完成比赛的13支队伍的成员。犬并非随机选取，而是来自比赛前易于进行检查的队伍。接受检查且完成比赛的队伍比例（14/17）与未接受检查且完成比赛的队伍比例（36/41）相似。
比较完成比赛的犬（n = 128）和未完成比赛的犬（n = 120）在年龄、性别、身体形态（体重、体长、胸廓宽度和周长）、心脏变量（心率、心动周期方差的自然对数、PR间期、QRS时限、QT指数、II导联和V3导联R波振幅、平均电轴、提示心肌疾病的心律失常）以及由赶狗人评估的运动排名方面的差异。
在完赛犬和未完赛犬之间唯一发现有显著差异（P < 0.05）的因素是由赶狗人评估的运动排名。通过逻辑回归确定运动排名以及经体重标准化的QRS时限或QRS时限为与完赛状态相关的变量（P < 0.15）。每个队伍的比赛时间与平均QRS时限之间存在显著（P < 0.0001）但较弱（R2 = 0.18）的线性关系。
在确定完赛状态方面，由赶狗人评估的运动排名是所研究变量中最重要的，而年龄、性别、身体形态和体重并不重要。QRS时限在确定完赛状态方面重要性较低。
