Effects of short‐term training and detraining on VO₂ kinetics: Faster VO₂ kinetics response after one training session

Abstract

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% of V ˙ O 2 m a x training intensity (n = 6 per group). V ˙ O 2 was measured breath-by-breath. Changes in deoxygenated-hemoglobin concentration (Δ[HHb]) were measured by near-infrared spectroscopy. Moderate-intensity exercise on-transient V ˙ O 2 and Δ[HHb] were modeled with a mono-exponential and normalized (0-100% of response) and the [ H H b ] / V ˙ O 2 ratio was calculated. Similar changes in time constant of V ˙ O 2 ( t V ˙ O 2 ) were observed in both groups. The combined group mean for t V ˙ O 2 decreased ∼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 p remained unchanged throughout the remaining of training and detraining. A significant "overshoot" in the [ H H b ] / V ˙ O 2 ratio was decreased (albeit not significant) after one training session, and abolished (P < 0.05) after the second one, with no overshoot observed thereafter. Speeding of V ˙ O 2 kinetics was remarkably quick with no further changes being observed with continuous training or during detraining. Improve matching of local O2 delivery to O2 utilization is a mechanism proposed to influence this response.

Effect of Exergame Training and Detraining on Lower-Body Strength, Agility, and Cardiorespiratory Fitness in Women with Fibromyalgia: Single-Blinded Randomized Controlled Trial

“…However, improvements made during the intervention may be lost when the training regimen is interrupted. For example, after 14 days of detraining following an aerobic intervention in a healthy population, peak VO2 significantly decreased [21,22]. In patients with FM, previous studies have shown that most improvements derived from exercise interventions disappeared after the detraining period [23,24].…”

Trunk Muscle Aerobic Metabolism Responses in Endurance Athletes, Combat Athletes and Untrained Men

“…It is well known that physical training may alter aerobic metabolism during exercise across systemic improvement in O 2 supply, by changes in cardiovascular and respiratory systems, and/or local improvement in muscle capacity to utilize O 2 during exercise [27]. These types of physiological adaptations differ according to the training modalities [14].…”

Fitness Level and Not Aging per se, Determines the Oxygen Uptake Kinetics Response

“…Further support is thus provided for these studies that have proposed increased O 2 distribution to the sites of increased metabolic demand playing an important role in the regulation of O 2 during exercise (Murias et al, 2010 , 2011a , 2014 ; McLay et al, 2016a ). For example, improved matching of O 2 delivery to O 2 utilization, which was associated to a faster O 2 kinetics response, has been demonstrated following brief (≤3 sessions) (Murias et al, 2016 ; McLay et al, 2017 ), short-term (~12 weeks) (Murias et al, 2010 , 2011a ) and long-term (Grey et al, 2015 ) training in both young and older participants. Although not investigated in this study, improved matching of O 2 delivery to O 2 utilization within the active tissues can be explained by different structural enhancements related to exercise training.…”

“…Previous research has typically shown a slower rate of adjustment of oxidative phosphorylation ( O 2 kinetics) in older compared to young individuals (Bell et al, 2001 ; Grassi, 2001 ; Hughson et al, 2001 ; duManoir et al, 2010 ; Murias et al, 2014 ; McLay et al, 2017 ). Despite this observation, a faster O 2 kinetics response can be observed in older individuals subsequent to endurance exercise training interventions (Babcock et al, 1994 ; Bell et al, 2001 ; Murias et al, 2010 , 2016 ; Keir et al, 2016 ; McLay et al, 2017 ). This observation demonstrates that this population is still malleable to produce adaptations within the cardiovascular system and within the skeletal muscle (Belman and Gaesser, 1991 ) that would result in a faster adjustment of O 2 at the onset of exercise.…”