Premium
Effects of short‐term training and detraining on VO 2 kinetics: Faster VO 2 kinetics response after one training session
Author(s) -
Murias J. M.,
Edwards J. A.,
Paterson D. H.
Publication year - 2016
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12487
Subject(s) - kinetics , zoology , chemistry , medicine , physics , biology , quantum mechanics
This study examined the time course of short‐term training and detraining‐induced changes in oxygen uptake ( V ˙ O 2 ) kinetics. Twelve men (24 ± 3 years) were assigned to either a 50% or a 70% ofV ˙ O 2 m a xtraining intensity ( n = 6 per group).V ˙ O 2was measured breath‐by‐breath. Changes in deoxygenated‐hemoglobin concentration (Δ[ HHb ]) were measured by near‐infrared spectroscopy. Moderate‐intensity exercise on‐transientV ˙ O 2and Δ[ HHb ] were modeled with a mono‐exponential and normalized (0–100% of response) and the[ H H b ] / V ˙ O 2ratio was calculated. Similar changes in time constant ofV ˙ O 2( t V ˙ O 2 ) were observed in both groups. The combined group mean for t V ˙ O 2decreased ∼14% (32.3 to 27.9 s, P < 0.05) after one training session with a further ∼11% decrease (27.9 to 24.8 s, P < 0.05) following two training sessions. The t V ˙ O 2 premained unchanged throughout the remaining of training and detraining. A significant “overshoot” in the[ H H b ] / V ˙ O 2ratio was decreased (albeit not significant) after one training session, and abolished ( P < 0.05) after the second one, with no overshoot observed thereafter. Speeding ofV ˙ O 2kinetics was remarkably quick with no further changes being observed with continuous training or during detraining. Improve matching of local O 2 delivery to O 2 utilization is a mechanism proposed to influence this response.