A Field Test for the Estimation of Heart Rate at Lactate Threshold : The 30-minute Cycling Time Trial Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tq57nv227

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  • The purpose of this study was to examine the validity and reliability of the 30-minute cycling time trial to estimate the heart rate at lactate threshold. Recreationally trained cyclists and triathletes (n = 47) performed 3 tests in random order: 1) One graded exercise test to directly determine lactate threshold (Dmax and 1.5mmol increase methods) 2) Two 30-minute stationary cycling time trials on a bicycle ergometer. The average heart rate and power over the last 20 minutes of the time trial was used to estimate lactate threshold. A subset of participants had respiratory gases measured during the graded test to determine ventilatory threshold and VO₂max (n=31). The heart rate and power during the two time trials were not different. The 30-minute cycling time trial over estimated the heart rate at lactate threshold (1.5mmol mean difference = 6.8 bpm, p < 0.0001; Dmax mean difference = 6.0 bpm, p < 0.001). Power during the last 20 minutes of the time trial did not differ from lactate threshold. In the subset of participants, ventilatory threshold heart rate and power were not significantly different than lactate threshold heart rate or power. These findings suggest the 30-minute stationary cycling time trial is reliable but should not be used for estimating the heart rate at lactate threshold.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2015-07-07T23:16:18Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) PartridgeStaciM2015.pdf: 1675229 bytes, checksum: 33bbfdb935eafc64bc26cce180b25a4e (MD5)
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  • description.provenance : Made available in DSpace on 2015-07-07T23:16:18Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) PartridgeStaciM2015.pdf: 1675229 bytes, checksum: 33bbfdb935eafc64bc26cce180b25a4e (MD5) Previous issue date: 2015-04-15
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