Figure 3 depicts this marginally significant “inverted U” pattern, whereby the greatest improvement in depression/anxiety symptoms was associated with very low- or very high levels of relative exertion.
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Perceived exertion as a moderator of psychological changes during nature-based exercise among U.S. service members.
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The sentences
First, the moderating effects of perceived exertion on depression-related outcomes are modest, with relatively small beta coefficients and marginal significance for some quadtratic terms.