Oliver J Quittmann1, Daniel Appelhans2, Thomas Abel3, Heiko K Strüder2. 1. Institute of Movement and Neurosciences, German Sport University Cologne, Germany. Electronic address: o.quittmann@dshs-koeln.de. 2. Institute of Movement and Neurosciences, German Sport University Cologne, Germany. 3. Institute of Movement and Neurosciences, German Sport University Cologne, Germany; European Research Group in Disability Sport (ERGiDS), Germany.
Abstract
OBJECTIVES: The aim of this study was to examine the reliability of maximal lactate accumulation rate (V˙Lamax) and sprint performance parameters in running and assess different approaches to determine alactic time interval (talac). DESIGN: Sixteen competitive runners (female=5; male=11) performed three trials (T1, T2 and T3) of an all-out 100-m sprint test separated by 48h. METHODS: Time to cover the 100m was determined by using a photoelectric light-barrier (t100,LB) and a stop-watch (t100,SW). Throughout the sprints, velocity was measured using a laser velocity guard (LAVEG) to estimate maximal velocity (vmax) and power (Pmax). The talac was calculated as the time when power decreased by 3.5% (tpmax-3.5%) and interpolated based on the sprint time (tinter,LB and tinter,SW). Reliability was assessed using intraclass correlation coefficient (ICC), typical error (TE) and smallest worthwhile change (SWC). RESULTS: After initial familiarisation, t100, tinter, vmax, Pmax and V˙Lamax attained excellent reliability (ICC≥0.90), whereas tpmax-3.5% attained moderate reliability (ICC=0.518). The reliability of V˙Lamax was higher when tinter,LB or tinter,SW were used (ICC=0.960) compared to using tpmax-3.5% (ICC=0.928). At T1, V˙Lamax was significantly higher when stop-watch measurements were used. There was no difference between tpmax-3.5% and the interpolated time intervals and the associated V˙Lamax-estimates. CONCLUSIONS: In running, V˙Lamax and sprint performance parameters can easily and high-reliably be measured using this sport-specific field test. Interpolating talac results in similar and more reliable values of V˙Lamax. To improve the reliability and accuracy of the stop-watch estimate, a familiarisation should be performed.
OBJECTIVES: The aim of this study was to examine the reliability of maximal lactate accumulation rate (V˙Lamax) and sprint performance parameters in running and assess different approaches to determine alactic time interval (talac). DESIGN: Sixteen competitive runners (female=5; male=11) performed three trials (T1, T2 and T3) of an all-out 100-m sprint test separated by 48h. METHODS: Time to cover the 100m was determined by using a photoelectric light-barrier (t100,LB) and a stop-watch (t100,SW). Throughout the sprints, velocity was measured using a laser velocity guard (LAVEG) to estimate maximal velocity (vmax) and power (Pmax). The talac was calculated as the time when power decreased by 3.5% (tpmax-3.5%) and interpolated based on the sprint time (tinter,LB and tinter,SW). Reliability was assessed using intraclass correlation coefficient (ICC), typical error (TE) and smallest worthwhile change (SWC). RESULTS: After initial familiarisation, t100, tinter, vmax, Pmax and V˙Lamax attained excellent reliability (ICC≥0.90), whereas tpmax-3.5% attained moderate reliability (ICC=0.518). The reliability of V˙Lamax was higher when tinter,LB or tinter,SW were used (ICC=0.960) compared to using tpmax-3.5% (ICC=0.928). At T1, V˙Lamax was significantly higher when stop-watch measurements were used. There was no difference between tpmax-3.5% and the interpolated time intervals and the associated V˙Lamax-estimates. CONCLUSIONS: In running, V˙Lamax and sprint performance parameters can easily and high-reliably be measured using this sport-specific field test. Interpolating talac results in similar and more reliable values of V˙Lamax. To improve the reliability and accuracy of the stop-watch estimate, a familiarisation should be performed.
Authors: Agnieszka Szurko; Teresa Kasprzyk-Kucewicz; Armand Cholewka; Maksymilian Kazior; Karolina Sieroń; Agata Stanek; Tadeusz Morawiec Journal: Int J Environ Res Public Health Date: 2022-07-12 Impact factor: 4.614