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Pain thresholds following maximal endurance exercise

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Abstract

Purpose

Physical exercise causes alterations in pain sensitivity. Many studies verified so-called exercise-induced analgesia caused by submaximal aerobic intensity. This study aimed to determine the effect of an endurance exercise to exhaustion on pain sensitivity of healthy young men.

Method

Pressure pain thresholds (PPTs) [in Newton, (N)] of 50 healthy males (mean age 26 ± 4 years) were applied to knee, ankle and elbow joints as well as to the sternum and forehead. This was followed by a bout of cycling ergometer exercise to exhaustion. The whole process was repeated after 20 and 60 min respectively.

Results

Endurance exercise to exhaustion decreased PPTs at sternum and forehead significantly, while thresholds at the joints were not affected. Pain thresholds at forehead and sternum declined 20 min after exercise with the forehead’s threshold being more reduced. PPTs remain decreased until 60 min after exercise (forehead: from 43.6 ± 15.2 N to 36.6 ± 19.8 N to 37.2 ± 13.4 N; sternum: from 46.8 ± 21.0 N to 42.5 ± 17.1 N to 44.8 ± 18.2 N). Modulation of pain sensitivity showed large effect sizes over time for both landmarks (forehead w = 0.65; sternum w = 0.50).

Conclusion

Exhaustive endurance exercise is followed by a hyperalgetic condition at forehead and sternum. This may be due to either a reduction in pain inhibiting or an activation in pain stimulating pathways.

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Abbreviations

EIH:

Exercise-induced hypoalgesia

PA:

Physical activity

PAG:

Periaqueductal gray

PPT:

Pressure pain threshold

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Acknowledgments

The authors thank PD Dr. U. F. Wehmeier for his scientific and E. Philips for her linguistic input on the manuscript.

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Correspondence to Steffen Krüger.

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Conflict of interest

The authors state that they have no interests, which might be perceived as posing a conflict or bias.

Additional information

Communicated by Fausto Baldissera.

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Krüger, S., Khayat, D., Hoffmeister, M. et al. Pain thresholds following maximal endurance exercise. Eur J Appl Physiol 116, 535–540 (2016). https://doi.org/10.1007/s00421-015-3307-5

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  • DOI: https://doi.org/10.1007/s00421-015-3307-5

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