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The run itself should feel hard and uncomfortable, and your heart rate will likely be 75 to 90% (or possibly more) of your maximum, Campbell says.—Jenny McCoy, SELF, 20 Mar. 2026 Researchers identified periods when participants had an elevated heart rate for 15 minutes or more to track physical activity.—Tom Gavin, EverydayHealth.com, 20 Mar. 2026 The researchers also measured heart rate, breathing and sleep.—Angelica Stabile, FOXNews.com, 19 Mar. 2026 There’s a growing body of research on animals which points to measurable impacts, including neural damage and changes in heart rate, the study notes.—Laura Paddison, CNN Money, 19 Mar. 2026 See All Example Sentences for heart rate