title: Wearable Lactate Threshold Predicting Device is Valid and Reliable in Runners.
abstract: Borges, NR and Driller, MW. Wearable lactate threshold predicting device is valid and reliable in runners. J Strength Cond Res 30(8): 2212-2218, 2016-A commercially available device claiming to be the world's first wearable lactate threshold predicting device (WLT), using near-infrared LED technology, has entered the market. The aim of this study was to determine the levels of agreement between the WLT-derived lactate threshold workload and traditional methods of lactate threshold (LT) calculation and the interdevice and intradevice reliability of the WLT. Fourteen (7 male, 7 female; mean ± SD; age: 18-45 years, height: 169 ± 9 cm, mass: 67 ± 13 kg, V[Combining Dot Above]O2max: 53 ± 9 ml·kg·min) subjects ranging from recreationally active to highly trained athletes completed an incremental exercise test to exhaustion on a treadmill. Blood lactate samples were taken at the end of each 3-minute stage during the test to determine lactate threshold using 5 traditional methods from blood lactate analysis which were then compared against the WLT predicted value. In a subset of the population (n = 12), repeat trials were performed to determine both inter-reliability and intrareliability of the WLT device. Intraclass correlation coefficient (ICC) found high to very high agreement between the WLT and traditional methods (ICC > 0.80), with TEMs and mean differences ranging between 3.9-10.2% and 1.3-9.4%. Both interdevice and intradevice reliability resulted in highly reproducible and comparable results (CV < 1.2%, TEM <0.2 km·h, ICC > 0.97). This study suggests that the WLT is a practical, reliable, and noninvasive tool for use in predicting LT in runners.
authors.affiliation: 1School of Medical and Applied Sciences, Central Queensland University, Rockhampton, Australia; and2University of Waikato, Hamilton, New Zealand.
authors.forename: Nattai R
authors.initials: NR
authors.lastname: Borges
authors.forename: Matthew W
authors.initials: MW
authors.lastname: Driller
mesh_terms: D000293:Adolescent; D000328:Adult; D015308:Anaerobic Threshold; D015415:Biomarkers / Q000097:blood; D005080:Exercise Test; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D019344:Lactic Acid