TY - JOUR
T1 - Laboratory 20-km cycle time trial reproducibility
AU - Zavorsky, Gerald Stanley
AU - Murias, J. M.
AU - Gow, J.
AU - Kim, D. J.
AU - Poulin-Harnois, C.
AU - Kubow, S.
AU - Lands, L. C.
PY - 2007/9
Y1 - 2007/9
N2 - This study evaluated the reproducibility of laboratory based 20-km time trials in well trained versus recreational cyclists. Eighteen cyclists (age = 34 ± 8 yrs; body mass index = 23.1 ± 2.2 kg/m2; V̇O2max = 4.19 ± 0.65 L/min) completed three 20-km time trials over a month on a Velotron cycle ergometer. Average power output (PO) (W), speed, and heart rate (HR) were significantly lower in the first time trial compared to the second and third time trial. The coefficients of variation (CV) between the second and third trial of the top eight performers for average PO, time to completion, and speed were 1.2%, 0.6%, 0.5%, respectively, compared to 4.8%, 2.0%, and 2.3% for the bottom ten. In addition, the average HR, V̇O2, and percentage of V̇O2max were similar between trials. This study demonstrated that (1) a familiarization session improves the reliability of the measurements (i.e., average PO, time to completion and speed), and (2) the CV was much smaller for the best performers.
AB - This study evaluated the reproducibility of laboratory based 20-km time trials in well trained versus recreational cyclists. Eighteen cyclists (age = 34 ± 8 yrs; body mass index = 23.1 ± 2.2 kg/m2; V̇O2max = 4.19 ± 0.65 L/min) completed three 20-km time trials over a month on a Velotron cycle ergometer. Average power output (PO) (W), speed, and heart rate (HR) were significantly lower in the first time trial compared to the second and third time trial. The coefficients of variation (CV) between the second and third trial of the top eight performers for average PO, time to completion, and speed were 1.2%, 0.6%, 0.5%, respectively, compared to 4.8%, 2.0%, and 2.3% for the bottom ten. In addition, the average HR, V̇O2, and percentage of V̇O2max were similar between trials. This study demonstrated that (1) a familiarization session improves the reliability of the measurements (i.e., average PO, time to completion and speed), and (2) the CV was much smaller for the best performers.
KW - Cyclists
KW - Power output
KW - Repeatability
UR - http://www.scopus.com/inward/record.url?scp=34548675582&partnerID=8YFLogxK
U2 - 10.1055/s-2007-964969
DO - 10.1055/s-2007-964969
M3 - Article
C2 - 17455116
AN - SCOPUS:34548675582
SN - 0172-4622
VL - 28
SP - 743
EP - 748
JO - International Journal of Sports Medicine
JF - International Journal of Sports Medicine
IS - 9
ER -