Hill Richard C, Lewis Daniel D, Randell Susan C, Scott Karen C, Omori Mayuko, Sundstrom Deborah A, Jones Galin L, Speakman John R, Butterwick Richard F
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126, USA.
Am J Vet Res. 2005 Jun;66(6):1065-70. doi: 10.2460/ajvr.2005.66.1065.
To determine whether mild restriction of food intake affects clinicopathologic variables, body composition, and performance of dogs undertaking intense sprint exercise.
9 trained healthy adult Greyhounds.
Dogs were offered food free choice once daily for 9 weeks until body weight and food intake stabilized. Dogs were then randomly assigned to be fed either 85% or 100% of this quantity of food in a crossover study (duration of each diet treatment period, 9 weeks). Dogs raced a distance of 500 m twice weekly. Clinicopathologic variables were assessed before and 5 minutes after racing; food intake, weight, body composition, body condition score, and race times were compared at the end of each diet period.
Compared with values associated with unrestricted access to food, there were significant decreases in mean body weight (by 6%) and median body condition score (from 3.75 to 3.5 on a 9-point scale) and the mean speed of the dogs was significantly faster (by 0.7 km/h) when food intake was restricted. Body composition and most clinicopathologic variables were unaffected by diet treatment, but dogs given restricted access to food had slightly fewer neutrophils, compared with values determined when food intake was unrestricted.
Results indicate that the common practice among Greyhound trainers of mildly restricting food intake of racing dogs to reduce body weight does improve sprint performance. A body condition score of approximately 3.5 on a 9-point scale is normal for a trained Greyhound in racing condition.
确定轻度限制食物摄入量是否会影响进行高强度短跑训练的犬的临床病理变量、身体组成和运动表现。
9只训练有素的健康成年灵缇犬。
犬只每天自由选择进食9周，直至体重和食物摄入量稳定。然后在一项交叉研究中，将犬只随机分为两组，分别给予该进食量的85%或100%的食物（每个饮食处理期持续9周）。犬只每周进行两次500米的赛跑。在赛跑前和赛跑后5分钟评估临床病理变量；在每个饮食期结束时比较食物摄入量、体重、身体组成、身体状况评分和赛跑时间。
与自由进食时的值相比，当食物摄入量受到限制时，犬只的平均体重显著下降（6%），身体状况评分中位数显著降低（从9分制的3.75降至3.5），且犬只的平均速度显著加快（0.7千米/小时）。饮食处理对身体组成和大多数临床病理变量没有影响，但与食物摄入量不受限制时测定的值相比，食物摄入量受限的犬只中性粒细胞略少。
结果表明，灵缇犬训练师普遍采用的轻度限制赛跑犬食物摄入量以减轻体重的做法确实能提高短跑成绩。对于处于比赛状态的训练有素的灵缇犬，9分制下身体状况评分为约3.5是正常的。
