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Therefore, 234 heart rate (HR) data sets obtained from extensive interval protocols of four participants during a twelve-week training intervention on a bike ergometer were analyzed. First, HR for each interval was approximated using a monoexponential formula. HR at onset of exercise (HR<jats:sub>start<\/jats:sub>), HR induced by load (HR<jats:sub>steady<\/jats:sub>) and the slope of HR (c) were analyzed. Furthermore, a calculation routine incrementally predicted HR<jats:sub>steady<\/jats:sub> using measured HR data after onset of exercise. Validity of original and approximated data sets were very high (r\u00b2 =0.962, SD =0.025; Max =0.991, Min =0.702). HR<jats:sub>start<\/jats:sub> was significantly different between all participants (one exception). HR<jats:sub>steady<\/jats:sub> was similar in all participants. Parameter c was independent of the duration of intervention and intervals regarding one training session but was significantly different in all participants (one exception). Final HR was correctly predicted on average after 58.8 s (SD = 34.77, Max =150 s, Min =30 s) based on a difference criteria of less than 5 bpm. In 3 participants, HR<jats:sub>steady<\/jats:sub> was predicted correctly in 142 out of 175 courses (81.1%).<\/jats:p>","DOI":"10.1515\/ijcss-2017-0011","type":"journal-article","created":{"date-parts":[[2017,12,6]],"date-time":"2017-12-06T22:16:34Z","timestamp":1512598594000},"page":"130-148","source":"Crossref","is-referenced-by-count":5,"title":["Predicting Short-Term HR Response to Varying Training Loads Using Exponential Equations"],"prefix":"10.1515","volume":"16","author":[{"given":"K.","family":"Hoffmann","sequence":"first","affiliation":[{"name":"Technische Universit\u00e4t Darmstadt, Institut f\u00fcr Sportwissenschaft, Darmstadt , Germany"}]},{"given":"J.","family":"Wiemeyer","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Darmstadt, Institut f\u00fcr Sportwissenschaft, Darmstadt , Germany"}]}],"member":"374","published-online":{"date-parts":[[2017,11,30]]},"reference":[{"key":"2021040703100755028_j_ijcss-2017-0011_ref_001_w2aab3b7b5b1b6b1ab1ab1Aa","unstructured":"\u01fastrand, P.O., & Rodahl, K. 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