@article {Lamberts36, author = {Robert P Lamberts and Michael I Lambert and Jeroen Swart and Timothy D Noakes}, title = {Allometric scaling of peak power output accurately predicts time trial performance and maximal oxygen consumption in trained cyclists}, volume = {46}, number = {1}, pages = {36--41}, year = {2012}, doi = {10.1136/bjsm.2010.083071}, publisher = {British Association of Sport and Excercise Medicine}, abstract = {Objective The purpose of this study was to determine if peak power output (PPO) adjusted for body mass0.32 is able to accurately predict 40-km time trial (40-km TT) performance. Methods 45 trained male cyclists completed after familiarisation, a PPO test including respiratory gas analysis, and a 40-km TT. PPO, maximal oxygen consumption (VO2max) and 40-km TT time were measured. Relationships between 40-km TT performance and (I) absolute PPO (W) and VO2max (l/min), (II) relative PPO (W/kg) and VO2max (ml/min/kg) and (III) PPO and VO2max adjusted for body mass (W/kg0.32 and ml/min/kg0.32, respectively) were studied. Results The continuous ramp protocol resulted in a similar relationship between PPO and VO2max (r=0.96, p\<0.0001) compared with a stepwise testing protocol but was associated with a lower standard error of the estimated when predicting VO2max. PPO adjusted for body mass (W/kg0.32) had the strongest relationship with 40-km TT performance (s) (r=-0.96, p\<0.0001). Although significant relationships were also found between absolute (W) and/or relative PPO (W/kg) and 40-km TT performance (s), these relationships were significantly weaker than the relationship between 40-km TT performance and PPO adjusted for body mass (W/kg0.32) (p\<0.0001). Conclusions VO2max can be accurately predicted from PPO when using a continuous ramp protocol, possibly even more accurately than when using a stepwise testing protocol. 40-km TT performance (s) in trained cyclists can be predicted most accurately by PPO adjusted for body mass (W/kg0.32). As both VO2max and 40-km TT performance can be accurately predicted from a PPO test, this suggests that (well)-trained cyclists can possibly be monitored more frequently and with fewer tests.}, issn = {0306-3674}, URL = {https://bjsm.bmj.com/content/46/1/36}, eprint = {https://bjsm.bmj.com/content/46/1/36.full.pdf}, journal = {British Journal of Sports Medicine} }