PDF(Pubmed)
Abstract：
Detection canines serve critical roles to support the military, homeland security and border protection. Some explosive detection tasks are physically demanding for dogs, and prior research suggests this can lead to a reduction in olfactory detection sensitivity. To further evaluate the effect of exercise intensity on olfactory sensitivity, we developed a novel olfactory paradigm that allowed us to measure olfactory detection thresholds while dogs exercised on a treadmill at two different exercise intensities. Dogs (n = 3) showed a decrement in olfactory detection for 1-bromooctane at 10-3 (v/v) dilutions and lower under greater exercise intensity. Dogs\' hit rate for the lowest concentration dropped from 0.87 ± 0.04 when walking at low intensity to below 0.45 ± 0.06 when trotting at moderate intensity. This decline had an interaction with the duration of the session in moderate intensity exercise, whereby dogs performed near 100% detection in the first 10 min of the 8 km/h session, but showed 0% detection after 20 min. Hit rates for high odor concentrations (10-2) were relatively stable at both low (1 ± 0.00) and moderate (0.91 ± 0.04) exercise intensities. The paradigm and apparatus developed here may be useful to help further understand causes of operationally relevant olfactory detection threshold decline in dogs.
摘要：
侦查犬在支持军队方面发挥着关键作用，国土安全和边境保护。一些爆炸物探测任务对狗的身体要求很高，先前的研究表明，这可能导致嗅觉检测灵敏度降低。为了进一步评估运动强度对嗅觉敏感性的影响，我们开发了一种新的嗅觉模式，使我们能够测量嗅觉检测阈值，而狗在跑步机上以两种不同的运动强度运动。狗（n=3）在10-3（v/v）稀释度下对1-溴辛烷的嗅觉检测降低，在更大的运动强度下降低。最低浓度的狗的命中率从低强度行走时的0.87±0.04下降到中等强度小跑时的0.45±0.06以下。这种下降与中等强度运动的持续时间有相互作用，因此，狗在8km/h会话的前10分钟内进行了接近100％的检测，但在20分钟后显示0%的检测。高气味浓度（10-2）的命中率在低（1±0.00）和中等（0.91±0.04）运动强度下都相对稳定。此处开发的范例和设备可能有助于进一步了解狗与操作相关的嗅觉检测阈值下降的原因。
