Non-invasive haemodynamic assessments using Innocor™ during standard graded exercise tests

Fontana, Piero; Boutellier, Urs; Toigo, Marco

doi:10.1007/s00421-009-1252-x

Cited by 22 publications

(14 citation statements)

References 26 publications

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“…During each trial, participants wore a facemask connected to an online metabolic system (Innocor, Innovision A/S, Odense, Denmark) to enable measurement of

\overset{Q}{true}

via an inert gas re‐breathing technique as previously described (Jakovljevic et al., ; Fontana et al., ). HR was recorded continuously via a standard chest strap and watch (FT1, Polar Electro, Kempele, Finland).…”

Section: Methodsmentioning

confidence: 99%

Unilateral bicep curl hemodynamics: Low‐pressure continuous vs high‐pressure intermittent blood flow restriction

Brandner

Kidgell

Warmington

2014

Scandinavian Med Sci Sports

104

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Light-load exercise training with blood flow restriction (BFR) increases muscle strength and size. However, the hemodynamics of BFR exercise appear elevated compared with non-BFR exercise. This questions the suitability of BFR in special/clinical populations. Nevertheless, hemodynamics of standard prescription protocols for BFR and traditional heavy-load exercise have not been compared. We investigated the hemodynamics of two common BFR exercise methods and two traditional resistance exercises. Twelve young males completed four unilateral elbow flexion exercise trials in a balanced, randomized crossover design: (a) heavy load [HL; 80% one-repetition maximum (1-RM)]; (b) light load (LL; 20% 1-RM); and two other light-load trials with BFR applied (c) continuously at 80% resting systolic blood pressure (BFR-C) or (d) intermittently at 130% resting systolic blood pressure (BFR-I). Hemodynamics were measured at baseline, during exercise, and for 60-min post-exercise. Exercising heart rate, blood pressure, cardiac output, and rate-pressure product were significantly greater for HL and BFR-I compared with LL. The magnitude of hemodynamic stress for BFR-C was between that of HL and LL. These data show reduced hemodynamics for continuous low-pressure BFR exercise compared with intermittent high-pressure BFR in young healthy populations. BFR remains a potentially viable method to improve muscle mass and strength in special/clinical populations.

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“…During each trial, participants wore a facemask connected to an online metabolic system (Innocor, Innovision A/S, Odense, Denmark) to enable measurement of

\overset{Q}{true}

Section: Methodsmentioning

confidence: 99%

Unilateral bicep curl hemodynamics: Low‐pressure continuous vs high‐pressure intermittent blood flow restriction

Brandner

Kidgell

Warmington

2014

Scandinavian Med Sci Sports

104

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“…1). To measure Q , participants completed a standard inert gas rebreathing technique, as described previously (Fontana et al 2010;Brandner et al 2015) (Innocor DK-5260, Innovision, Odense, Denmark). For LP, all rebreathing manoeuvres were undertaken at a breathing rate synchronised with the contraction cycle to minimise transmural pressures, provide some haemodynamic protection and a more consistent approach to haemodynamic measurements.…”

Section: Haemodynamic Parametersmentioning

confidence: 99%

Haemodynamics of aerobic and resistance blood flow restriction exercise in young and older adults

et al. 2015

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“…We previously used the same incremental protocol to show that test-retest reliability of cardiac output and stroke volume during a GXT is high (Fontana et al 2009). Furthermore, we demonstrated that at 46 and 103 s after a power stage transition (54-69, 69-77 and 77-85% peak power) both cardiac output and stroke volume are similar (Fontana et al 2010), indicating that less than 46 s are needed to reach a steady state for cardiac output and stroke volume. For WT, participants started unloaded pedalling as fast as possible.…”

Section: Study Design and Experimental Setupmentioning

confidence: 68%

“…Finally, we want to address the issue that maximal stroke volume might have been underestimated during the GXT. It appears that during a GXT with constant power increments, stroke volume reaches maximal values already at 64% peak power and remains at this level until exhaustion (Calbet et al 2007;Fontana et al 2010). In contrast, for GXT protocols with varying power increments it has been shown that stroke volume is maximal at 80% and subsequently decreases to reach a significantly lower value at exhaustion (Mortensen et al 2005).…”

Section: Discussionmentioning

confidence: 89%

Cardiac output but not stroke volume is similar in a Wingate and $$ \dot{V}{\text{O}}_{{ 2 {\text{peak}}}} $$ test in young men

et al. 2010

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Wingate test (WT) training programmes lasting 2-3 weeks lead to improved peak oxygen consumption. If a single 30 s WT was capable of significantly increasing stroke volume and cardiac output, the increase in peak oxygen consumption could possibly be explained by improved oxygen delivery. Thus, we investigated whether a single WT increases stroke volume and cardiac output to similar levels than those obtained at peak exercise during a graded cycling exercise test (GXT) to exhaustion. Fifteen healthy young men (peak oxygen consumption 45.0 ± 5.3 ml kg(-1) min(-1)) performed one WT and one GXT on separate days in randomised order. During the tests, we estimated cardiac output using inert gas rebreathing (nitrous oxide and sulphur hexafluoride) and subsequently calculated stroke volume. We found that cardiac output was similar (18.2 ± 3.3 vs. 17.9 ± 2.6 l min(-1); P = 0.744), stroke volume was higher (127 ± 37 vs. 94 ± 15 ml; P < 0.001), and heart rate was lower (149 ± 26 vs. 190 ± 12 beats min(-1); P < 0.001) at the end (27 ± 2 s) of a WT as compared to peak exercise during a GXT. Our results suggest that a single WT produces a haemodynamic response which is characterised by similar cardiac output, higher stroke volume and lower heart rate as compared to peak exercise during a GXT.

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Non-invasive haemodynamic assessments using Innocor™ during standard graded exercise tests

Cited by 22 publications

References 26 publications

Unilateral bicep curl hemodynamics: Low‐pressure continuous vs high‐pressure intermittent blood flow restriction

Unilateral bicep curl hemodynamics: Low‐pressure continuous vs high‐pressure intermittent blood flow restriction

Haemodynamics of aerobic and resistance blood flow restriction exercise in young and older adults

Cardiac output but not stroke volume is similar in a Wingate and $$ \dot{V}{\text{O}}_{{ 2 {\text{peak}}}} $$ test in young men

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