Problems in quantifying bone response to exercise in horses: a review

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Abstract
Detecting changes in bone during growth, training, rest from competition (spelling), and disease in horses requires imaging techniques that have a high level of accuracy and precision. Currently, most imaging techniques used in horses do not possess such characteristics and are more suitable for detecting endstage disease than subtle changes. Some are incapable of detecting changes in bone size. Non-planar techniques should be used for estimating or determining bone strength. This review outlines available imaging techniques and shows why cross-sectional procedures are required to accurately estimate bone strength. If these can be validated and improved for use in the standing horse, serial examination can be used to show the magnitude of changes in bone strength that occur during training or varying management regimens. Such knowledge can then be used to improve training and spelling regimens for equine athletes, hopefully resulting in a reduction in racing or athletic injury.