Exercise tolerance during flat over-ground intermittent running: modelling the expenditure and reconstitution kinetics of work done above critical power.

ABSTRACT: PURPOSE:We compared a new locomotor-specific model to track the expenditure and reconstitution of work done above critical power (W´) and balance of W´ (W´BAL) by modelling flat over-ground power during exhaustive intermittent running. METHOD:Nine male participants completed a ramp test, 3-min all-out test and the 30-15 intermittent fitness test (30-15 IFT), and performed a severe-intensity constant work-rate trial (SCWR) at the maximum oxygen uptake velocity (vV?O2max). Four intermittent trials followed: 60-s at vV?O2max?+?50% ?1 (?1?=?vV?O2max - critical velocity [VCrit]) interspersed by 30-s in light (SL; 40% vV?O2max), moderate (SM; 90% gas-exchange threshold velocity [VGET]), heavy (SH; VGET?+?50% ?2 [?2?=?VCrit - VGET]), or severe (SS; vV?O2max -?50% ?1) domains. Data from Global Positioning Systems were derived to model over-ground power. The difference between critical and recovery power (DCP), time constant for reconstitution of W´ ([Formula: see text]), time to limit of tolerance (TLIM), and W´BAL from the integral (W´BALint), differential (W´BALdiff), and locomotor-specific (OG-W´BAL) methods were compared. RESULTS:The relationship between [Formula: see text] and DCP was exponential (r2?=?0.52). The [Formula: see text] for SL, SM, and SH trials were 119?±?32-s, 190?±?45-s, and 336?±?77-s, respectively. Actual TLIM in the 30-15 IFT (968?±?117-s) compared closely to TLIM predicted by OG-W´BAL (929?±?94-s, P?>?0.100) and W´BALdiff (938?±?84-s, P?>?0.100) but not to W´BALint (848?±?91-s, P?=?0.001). CONCLUSION:The OG-W´BAL accurately tracked W´ kinetics during intermittent running to exhaustion on flat surfaces.

SUBMITTER: Vassallo C 

PROVIDER: S-EPMC6969867 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature