Suprathreshold heat pain response predicts activity-related pain, but not rest-related pain, in an exercise-induced injury model

Exercise-induced injury models are useful for studying pain since the onset of pain is controlled and both pre-injury and post-injury factors can be utilized as explanatory variables or predictors. In these studies, rest-related pain is frequently considered the primary dependent variable or outcome, as opposed to a measure of activity-related pain. In addition, few studies include pain sensitivity measures as predictors. This study examined the influence of pre-injury and post-injury factors, including pain sensitivity, for induced rest and activity-related pain after exercise induced muscle injury. The overall goal of this investigation was to determine if there were convergent or divergent predictors of rest and activity-related pain. One hundred forty-three participants provided demographic, psychological, and pain sensitivity information and underwent a standard fatigue trial of resistance exercise to induce injury of the dominant shoulder. Pain at rest and during active and resisted shoulder motion were measured at 48- and 96-hours post-injury. Separate hierarchical models were generated for assessing the influence of pre-injury and post-injury factors on 48- and 96-hour rest-related and activity-related pain. Overall, no universal predictor of pain across all models was found. However, pre-injury and post-injury suprathreshold heat pain response (SHPR), a pain sensitivity measure, was a consistent predictor of activity-related pain, even after controlling for known psychological factors.

These results imply there is differential prediction of pain. A measure of pain sensitivity such as SHPR appears more influential for activity-related pain, but not rest-related pain, and may reflect different underlying processes involved during pain appraisal.

Principles of Exercise Rehabilitation

Join Lee Herrington to explore the fundamentals of physical stress theory, the effects of loading, mobility and rigidity and the influence of pain, to improve the foundations of all your…

Speak your mind

Your email will not be published.