muscle oxygenation Dotaz Zobrazit nápovědu
Inactive forearm muscle oxygenation has been reported to begin decreasing from the respiratory compensation point (RCP) during ramp leg cycling. From the RCP, hyperventilation occurs with a decrease in arterial CO2 pressure (PaCO2). The aim of this study was to determine which of these two factors, hyperventilation or decrease in PaCO2, is related to a decrease in inactive biceps brachii muscle oxygenation during leg cycling. Each subject (n = 7) performed a 6-min two-step leg cycling. The exercise intensity in the first step (3 min) was halfway between the ventilatory threshold and RCP (170±21 watts), while that in the second step (3 min) was halfway between the RCP and peak oxygen uptake (240±28 watts). The amount of hyperventilation and PaCO2 were calculated from gas parameters. The average cross correlation function in seven subjects between inactive muscle oxygenation and amount of hyperventilation showed a negative peak at the time shift of zero (r = -0.72, p<0.001), while that between inactive muscle oxygenation and calculated PaCO2 showed no peak near the time shift of zero. Thus, we concluded that decrease in oxygenation in inactive arm muscle is closely coupled with increase in the amount of hyperventilation.
- MeSH
- blízká infračervená spektroskopie metody využití MeSH
- ergometrie metody využití MeSH
- hyperventilace krev metabolismus MeSH
- kosterní svaly fyziologie metabolismus MeSH
- lidé MeSH
- oxid uhličitý krev škodlivé účinky MeSH
- paže fyziologie krevní zásobení MeSH
- spotřeba kyslíku fyziologie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- srovnávací studie MeSH
Autoři popisují případ novorozence s laparoschízou, u kterého došlo v pooperačním období k rozvoji těžké idiopatické pUcní hypertenze s nutností zahájení mimotělní membránové oxygenace k udržení oběhové stability a adekvátní oxemie. Po 75 hodinách veno-arteriálního mimotělního oběhu (pumpa Biomedicus BP 50, oxygenator Jostra M8) s maximální podporou 50 % srdečního výdeje bylo dítě převedeno na konvenční ventilaci s inhalací oxidu dusnatého a následně extubováno. V průběhu mimotělní membránové oxygenace, pri celkové heparinizaci, nebyly zaznamenány žádné krvácivé projevy v souvislosti s operačním výkonem.
The authors describe the case of newborn with laparoschisis in whom severe idiopathic pulmonary hypertenSión during postoperative period developed and initiation of extracorporeal membrane oxygenation (ECMO) to maintain circulatory stability and adequate oxygenation was necessary. ECMO was performed for 75 hours with maximum extracorporeal support up to 50% of cardiac output (Biomedicus pump BP 50, Jostra oxygenator M8). Patient was successfully weaned and switched to conventional ventilation and nitric oxide inhalation with consequent extubation. No bleeding complications were observed during ECMO in connection with surgical repair of laparoschisis.
- MeSH
- břišní svaly chirurgie patologie MeSH
- dítě MeSH
- finanční podpora výzkumu jako téma MeSH
- lidé MeSH
- mimotělní membránová oxygenace metody MeSH
- novorozenec MeSH
- plicní hypertenze MeSH
- pooperační komplikace MeSH
- prolaps MeSH
- střeva chirurgie MeSH
- Check Tag
- dítě MeSH
- lidé MeSH
- novorozenec MeSH
- Geografické názvy
- Česká republika MeSH
The aim of the present study was to compare the oscillations of oxygenation in skeletal muscle between early and late phases in prolonged exercise. During prolonged exercise at 60 % of peak oxygen uptake (V(.)o(2)) for 60 min and at rest, oxygenated hemoglobin/myoglobin (Hb/MbO(2)) and total Hb/Mb (THb/Mb) were determined by near-infrared spectroscopy in the vastus lateralis. Power spectra density (PSD) for the difference between Hb/MbO(2) and THb/Mb (-HHb/MbO(2): deoxygenation) was obtained by fast Fourier transform at rest, in the early phase (1-6 min) and in the late phase (55-60 min) in exercise. Peak PSD in the early phase was significantly higher than that at rest. There were at least three peaks of PSD in exercise. The highest peak was a band around 0.01 Hz, the next peak was a band around 0.04 Hz, and the lowest peak was a band around 0.06 Hz. PSD in the early phase was not significantly different from that in the late phase in exercise. Heart rate (HR) showed a continuous significant increase from 3 min in exercise until the end of exercise. Skin blood flow (SBF) around the early phase was significantly lower than that around the late phase. It was concluded that oscillation of oxygenation in the muscle oxygen system in the early phase is not different from that in the late phase in prolonged exercise despite cardiovascular drift.
- MeSH
- biologické hodiny fyziologie MeSH
- cvičení fyziologie MeSH
- dospělí MeSH
- fyzická vytrvalost fyziologie MeSH
- fyziologická adaptace fyziologie MeSH
- kosterní svaly fyziologie MeSH
- kyslík metabolismus MeSH
- lidé MeSH
- spotřeba kyslíku fyziologie MeSH
- svalová kontrakce fyziologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
Background. Bouldering and lead climbing are divergent disciplines of the sport of rock climbing. Bouldering moves are short and powerful, whilst sport climbing is longer and require a greater degree of endurance. Aim. The aim of this study was to compare forearm muscle oxygenation during sustained isometric contraction between lead climbers (LC) and boulderers (BO). Methods. Eight BO and twelve LC completed maximal finger flexor strength test and sustained contractions to exhaustion at 60% of maximum voluntary contraction (MVC). Differences between BO and LC in maximal strength, time to exhaustion, force time integral (FTI), and tissue oxygenation (SmO2) were assessed by t-test for independent samples. Results. LC showed significantly lower level of average tissue oxygenation (BO 38.9% SmO2, s = 7.4; LC 28.7% SmO2, s = 7.1) and maximal tissue deoxygenation (BO 25.6% SmO2, s = 8.2; LC 13.5% SmO2, s = 8.5). LC demonstrated significantly lower finger flexor strength (519 N, s = 72) than BO (621 N, s = 142). LC sustained a longer time of contraction (not significantly) (BO 52.2 s, s = 11.5; LC 60.6 s, s = 13) and achieved a similar value of FTI (BO 17421 Ns, s = 4291; LO 17476 Ns, s = 5036) in the endurance test. Conclusions. The results showed lower deoxygenation during sustained contraction in BO than LC despite similar FTI, indicating different local metabolic pathways in both groups.
- Klíčová slova
- izometrické kontrakce, svalové okysličování, test odolnosti, bouldering, sportovní lezení,
- MeSH
- dospělí MeSH
- horolezectví * klasifikace statistika a číselné údaje trendy MeSH
- lidé MeSH
- předloktí * MeSH
- svaly * krevní zásobení MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
Anthocyanin-rich New Zealand blackcurrant (NZBC) may improve forearm muscle oxygenation and enhance performance in high-level rock climbers. As such, using a double-blind, randomised, cross-over design study, twelve participants performed an oxidative capacity assessment, and two successive exhaustive exercise trials (submaximal forearm muscle contractions at 60% of their maximal volitional contraction). Each visit was conducted following 7-days intake of 600 mg·day-1 NZBC extract or placebo. Oxidative capacity was estimated by calculating the oxygen half time recovery using near infrared spectroscopy. Time to exhaustion (s), impulse (kg·s), and minimum tissue saturation index (min-TSI %) were assessed during both the exercise trials. Muscle oxidative capacity was greater with NZBC (mean difference [MD] = 5.3 s, 95% confidence intervals [95% CI] = 0.4-10.2 s; p = 0.036; Cohen's d = 0.94). During the exercise trials, there was an interaction for min-TSI % (time x condition, p = 0.046; ηp2 = 0.372), which indicated a greater level of oxygen extraction during trial two with NZBC extract (MD = 9%, 95% CI = 2-15%) compared to the placebo (MD = 2%, 95% CI = 1-7%). There was a decrease in time to exhaustion (p <0.001, ηp2 = 0.693) and impulse (p = 0.001, ηp2 = 0.672) in exercise trial two, with no effect of NZBC extract. In high-level rock climbers 7-days NZBC extract improves forearm muscle oxygenation with no effect on isolated forearm muscle performance.
- MeSH
- blízká infračervená spektroskopie MeSH
- dospělí MeSH
- dvojitá slepá metoda MeSH
- horolezectví fyziologie MeSH
- klinické křížové studie MeSH
- kosterní svaly fyziologie MeSH
- lidé MeSH
- mladý dospělý MeSH
- předloktí fyziologie MeSH
- Ribes chemie MeSH
- rostlinné extrakty aplikace a dávkování MeSH
- sportovní výkon fyziologie MeSH
- spotřeba kyslíku MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- randomizované kontrolované studie MeSH
