Abstract
How parameters derived from oxygen uptake kinetics relate to critical speed is not fully understood, and how such parameters relate to more sport-specific performances, such as shuttle running, has not been investigated. Therefore, the primary aims of the present student were to examine the kinetics during all-out linear and shuttle running and compare physiological variables of all-out running to variables measured during a graded exercise test (GXT). Fifteen male soccer players performed a graded exercise test (GXT) and the kinetics from a series of three different 3-min all-out tests (3MT’s) were evaluated. achieved during the GXT did not differ from maximal achieved during the all-out tests (F = 1.85, p = 0.13) (overall ICC = 0.65; typical error = 2.48 ml∙kg-1∙min-1; coefficient of variation = 4.8%). A moderate, inverse correlation (r = -0.62, p = 0.02) was observed between τ (14.7 ± 1.92 s) and CS (3.96 ± 0.52 m∙s-1) despite the narrow SD for τ. No differences (p > 0.05) were observed for any of the kinetics between continuous and shuttle running bouts. The linear running 3MT (r3MT) represents a viable surrogate to the GXT and data beyond CS and D’ may be gleaned by using the bi-exponential speed-time model.
Citation: Kramer M, Du Randt R, Watson M, Pettitt RW (2018) Oxygen uptake kinetics and speed-time correlates of modified 3-minute all-out shuttle running in soccer players. PLoS ONE 13(8):
e0201389.
https://doi.org/10.1371/journal.pone.0201389
Editor: Alessandro Moura Zagatto, Sao Paulo State University - UNESP, BRAZIL
Received: February 20, 2018; Accepted: June 13, 2018; Published: August 21, 2018
Copyright: © 2018 Kramer et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: To enhance the reproducibility of the results we have gladly deposited our data in an online repository (https://doi.org/10.7910/DVN/3JVSOH).
Funding: The authors received no specific funding for this work.
Competing interests: The authors have declared that no competing interests exist.
Abbreviations:
,
rate of pulmonary oxygen uptake; ,
rate of pulmonary carbon dioxide expulsion; HRmax,
maximum heart rate; BF,
breathing frequency; ,
minute ventilation; CP,
critical power; RER,
respiratory exchange ratio; CS,
critical speed; GET,
gas exchange threshold; Δ50%,
midpoint between GET and ; D’,
curvature constant of the speed-time relationship for high-intensity exercise (maximum distance covered at speeds above CS); r3MT,
3-minute maximal run test; TE,
typical error; ICC,
intra-rater correlation coefficient; CV,
coefficient of variation; O2,
oxygen; CO2,
carbon dioxide
Description
The study investigates oxygen uptake kinetics in soccer players during modified shuttle running tests.