TY  - JOUR
A1  - Wiesner, Stefan
A1  - Birkenfeld, Andreas L.
A1  - Engeli, Stefan
A1  - Haufe, Sven
A1  - Brechtel, Lars
A1  - Wein, J.
A1  - Hermsdorf, Mario
A1  - Karnahl, Brita
A1  - Berlan, Michel
A1  - Lafontan, Max
A1  - Sweep, Fred C. G. J.
A1  - Luft, Friedrich C.
A1  - Jordan, Jens
T1  - Neurohumoral and metabolic response to exercise in water
N2  - Atrial natriuretic peptide (ANP) stimulates lipid mobilization and lipid oxidation in humans. The mechanism appears to promote lipid mobilization during exercise. We tested the hypothesis that water immersion augments exercise- induced ANP release and that the change in ANP availability is associated with increased lipid mobilization and lipid oxidation. In an open randomized and cross-over fashion we studied 17 men (age 31 +/- 3.6 years; body mass index 24 +/- 1.7 kg/m(2); body fat 17 +/- 6.7%) on no medication. Subjects underwent two incremental exercise tests on a bicycle ergometer. One test was conducted on land and the other test during immersion in water up to the xiphoid process. In a subset (n = 7), we obtained electromyography recordings in the left leg. We monitored gas exchange, blood pressure, and heart rate. In addition, we obtained blood samples towards the end of each exercise step to determine ANP, norepinephrine, epinephrine, lactate, free fatty acids, insulin, and glucose concentrations. Heart rate, systolic blood pressure, and oxygen consumption at the anaerobic threshold and during peak exercise were similar on land and with exercise in water. The respiratory quotient was mildly reduced when subjects exercised in water. Glucose and lactate measurements were decreased whereas free fatty acid concentrations were increased with exercise in water. Water immersion attenuated epinephrine and norepinephrine and augmented ANP release during exercise. Even though water immersion blunts exercise-induced sympathoadrenal activation, lipid mobilization and lipid oxidation rate are maintained or even improved. The response may be explained by augmented ANP release.
Y1  - 2010
UR  - http://www.thieme-connect.com/ejournals/toc/hmr
U6  - https://doi.org/10.1055/s-0030-1248250
SN  - 0018-5043
ER  - 
TY  - JOUR
A1  - Wolff, Christian Michael
A1  - Frischmann, Peter D.
A1  - Schulze, Marcus
A1  - Bohn, Bernhard J.
A1  - Wein, Robin
A1  - Livadas, Panajotis
A1  - Carlson, Michael T.
A1  - Jäckel, Frank
A1  - Feldmann, Jochen
A1  - Würthner, Frank
A1  - Stolarczyk, Jacek K.
T1  - All-in-one visible-light-driven water splitting by combining nanoparticulate and molecular co-catalysts on CdS nanorods
JF  - Nature Energy
N2  - Full water splitting into hydrogen and oxygen on semiconductor nanocrystals is a challenging task; overpotentials must be overcome for both half-reactions and different catalytic sites are needed to facilitate them. Additionally, efficient charge separation and prevention of back reactions are necessary. Here, we report simultaneous H-2 and O-2 evolution by CdS nanorods decorated with nanoparticulate reduction and molecular oxidation co-catalysts. The process proceeds entirely without sacrificial agents and relies on the nanorod morphology of CdS to spatially separate the reduction and oxidation sites. Hydrogen is generated on Pt nanoparticles grown at the nanorod tips, while Ru(tpy)(bpy)Cl-2-based oxidation catalysts are anchored through dithiocarbamate bonds onto the sides of the nanorod. O-2 generation from water was verified by O-18 isotope labelling experiments, and time-resolved spectroscopic results confirmed efficient charge separation and ultrafast electron and hole transfer to the reaction sites. The system demonstrates that combining nanoparticulate and molecular catalysts on anisotropic nanocrystals provides an effective pathway for visible-light-driven photocatalytic water splitting.
Y1  - 2018
U6  - https://doi.org/10.1038/s41560-018-0229-6
SN  - 2058-7546
VL  - 3
IS  - 10
SP  - 862
EP  - 869
PB  - Nature Publ. Group
CY  - London
ER  -