Gunnar Treff

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PURPOSE To investigate the incidence of hyponatremia and its relationship to plasma copeptin, a surrogate marker for arginine vasopressin (AVP) during 28 days of high-volume rowing training. METHODS Thirty rowers from the German junior national team (21 male) were studied during a training camp. Serum sodium ([Na(+)]), osmolality, and copeptin were(More)
Resistance training induces differenciated adaptions. Depending on the applied method, neural or anabolic adaptions may dominate. Neural adaptions already reveal in the early stage of a training program, since force improvements can be seen even without muscle hypertrophy. During this phase, upcoming adaptions on myofibrilliar protein level are initiated on(More)
Elite rowers are highly endurance trained and present with a large lean body mass (LBM), which is closely related to total haemoglobin mass (tHbmass), a major determinant of blood O2-transport. This study aims to determine the magnitude of tHbmass in elite rowers and its relation to performance parameters that are common in rowing worldwide. 13 rowers (3(More)
We measured horizontal saccadic velocities for 20 degrees saccades in 25 normal humans. Percent differences for various muscle pairs were calculated for each subject. For example, percent differences of the antagonist muscles averaged +4.9 +/- 10% and percent differences of symmetrical muscles averaged -9.2 +/- 9%. This percent difference type of data,(More)
OBJECTIVES To elucidate cell free DNA (cfDNA) clearance kinetics following an acute bout of high intensity exercise by measuring circulating DNase activity reduction (AR). DESIGN AND METHODS Serum cfDNA concentration and DNase-AR were measured prior to and post (immediately post, 7 and 30 min post) an acute bout of rowing exercise until exhaustion. (More)
Introduction Over the past few years, training load and performance in competition has continuously increased and is fraught with risk to result in the accumulation of fatiguing conditions. The coach determines training success by controlling boat speed, performance, power and soft parameters like stability of rowing technique, capacity to teamwork, and(More)
This study examined sleep-wake habits and subjective jet-lag ratings of 55 German junior rowers (n = 30 male, 17.8 ± 0.5 years) before and during the World Rowing Junior Championships 2015 in Rio de Janeiro, Brazil. Athletes answered sleep logs every morning, and Liverpool John Moore's University Jet-Lag Questionnaires each evening and morning. Following an(More)
We developed a mathematical model to predict the probable success rate of the first surgery to correct acquired esotropia with normal accommodative convergence-accommodation ratio in children. A computer-averaged dose-response curve of the effect of 68 bilateral medial rectus recessions was combined with various assumptions regarding likely errors in(More)
Polarized (POL) training intensity distribution (TID) emphasizes high-volume low-intensity exercise in zone (Z)1 (< first lactate threshold) with a greater proportion of high-intensity Z3 (>second lactate threshold) compared to Z2 (between first and second lactate threshold). In highly trained rowers there is a lack of prospective controlled evidence(More)
Background Hypohydration is associated with impaired endurance performance and increased heat stress. Therefore, rehydration after exercise needs to be sufficient. However, several athletes tend to hypohydrate especially during training camps. To allow exact quantification of necessary rehydration volume in order to prevent hypohydration, this study aimed(More)