Abstract
Background
The phenomenon of exercise‐induced hypoalgesia and concomitant mood changes is well established. How exercise‐induced hypoalgesia and affective responses are shaped by the intensity of an acute exercise bout and individual fitness levels is as yet not well understood. This study investigates whether heat pain threshold (PTh), pain tolerance (PTol), and affective parameters are modulated by the intensity of an acute exercise bout and/or individuals' fitness level. Stronger analgesic responses are hypothesized after high‐intensity exercise in physically fitter subjects, possibly in sync with concomitant mood changes.
Methods
Thirty‐three healthy men were recruited (sedentary: N=17 or recreational: N=14; mean age: 25.3±4.4 years). After a fitness assessment on a cycle ergometer, subjects underwent three experimental conditions on separate days: high (20 minutes exercise 20% above lactate threshold), low (20 minutes exercise 20% below lactate threshold) and control (seated rest). Before and after each intervention Positive and Negative Affect Schedule, PTh and PTol (cold water emersion test) were assessed.
Results
Results indicate an increase of the Positive Affect Scale (high: 26.7±9.0 vs. 32.9±7.1, p<0.001; low: 26.3±7.2 vs. 32.0±7.0, p<0.001) and PTh (high: 45.1±3.1 °C vs. 46.0±2.6 °C, p=0.003; low: 45.4±2.7 °C vs. 45.9±2.6 °C, p=0.012) after both exercise conditions. In an exploratory analysis, PTol significantly increased only after the high exercise condition (51.2±33.7 sec. vs. 72.4±64.0 sec., p=0.045). Fitness level was positively correlated with the increase in PTol from pre to post high‐intensity exercise (r=0.59, p(one‐tailed)=0.002).
Conclusion
Exercise‐induced hypoalgesia depends on exercise intensity and appears to be influenced by individual fitness status, independent of mood responses.
from Wiley: European Journal of Pain: Table of Contents https://ift.tt/37hsqxu
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