The influence of physical activity on the nociceptive flexion reflex in healthy people

ABSTRACT

Background

The nociceptive flexion reflex (NFR) is a spinal reflex induced by painful stimuli resulting in an appropriate withdrawal response. The NFR is considered to be an objective physiological correlate of spinal nociception. Previous research has already demonstrated that physical activity (PA) can influence pain assessments. To date, no studies have directly examined the relationship between PA and spinal nociception. Hence, this study aimed to investigate whether the NFR threshold can be predicted by report‐based and monitor‐based measures of PA in healthy adults.

Methods

PA and the NFR threshold of 58 healthy adults were assessed. PA was evaluated by self‐report using the International Physical Activity Questionnaire and by monitor‐based accelerometry data. The NFR threshold was elicited through transcutaneous electrical stimulation of the sural nerve and quantified by the biceps femoris muscle electromyogram. Hierarchical linear regression analyses were performed to determine the relationship between PA and the NFR, while controlling for confounders.

Results

Monitor‐based measured step count and activities of moderate‐vigorous intensity predicted the NFR threshold accounting for 23.0% (p=0.047) to 37.1% (p=0.002) of the variance. Larger amounts of step counts and higher participation in moderate‐vigorous intensity activities predicted higher NFR thresholds. Monitor‐based activities of sedentary intensity predicted the NFR threshold accounting for 35.8% (p=0.014) to 35.9% (p=0.014) of the variance. Spending more time per day on activities of sedentary intensity predicted lower NFR thresholds.

Conclusions

The study provides preliminary evidence indicating that a physically active lifestyle may reduce spinal nociception in healthy adults, while a sedentary lifestyle enhances spinal nociception.

from Wiley: European Journal of Pain: Table of Contents https://ift.tt/2ICqUOX
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