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300 results on '"Jensen-Urstad, M."'

4. Low incidence of major complications after the first six hours post-atrial fibrillation ablation – same-day discharge safe and feasible in most patients

Author

Paul Nordin, A, primary, Drca, N, additional, Insulander, P, additional, Bastani, H, additional, Bourke, T, additional, Braunschweig, F, additional, Kenneback, G, additional, Von Olshausen, G, additional, Sadigh, B, additional, Saluveer, O, additional, Tapanainen, J, additional, Schwieler, J, additional, Akerstrom, F, additional, and Jensen-Urstad, M, additional

Published
2021
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6. Why do arms extract less oxygen than legs during exercise?

Author

Calbet, J.A.L., Holmberg, H.-C., Rosdahl, H., van Hall, G., Jensen-Urstad, M., and Saltin, B.

Subjects
Blood flow -- Research, Fatigue -- Research, Biological sciences
Abstract

To determine whether conditions for [O.sub.2] utilization and [O.sub.2] off-loading from the hemoglobin are different in exercising arms and legs, six cross-country skiers participated in this study. Femoral and subclavian vein blood flow and gases were determined during skiing on a treadmill at ~76% maximal [O.sub.2] uptake (V[O.sub.2 max]) and at V[O.sub.2 max] with different techniques: diagonal stride (combined arm and leg exercise), double poling (predominantly arm exercise), and leg skiing (predominantly leg exercise). The percentage of [O.sub.2] extraction was always higher for the legs than for the arms. At maximal exercise (diagonal stride), the corresponding mean values were 93 and 85% (n = 3; P < 0.05). During exercise, mean arm [O.sub.2] extraction correlated with the P[O.sub.2] value that causes hemoglobin to be 50% saturated ([P.sub.50]: r = 0.93, P < 0.05), but for a given value of [P.sub.50], [O.sub.2] extraction was always higher in the legs than in the arms. Mean capillary muscle [O.sub.2] conductance of the arm during double poling was 14.5 (SD 2.6) ml x [min.sup.-1] x mm[Hg.sup.-1], and mean capillary P[o.sub.2] was 47.7 (SD 2.6) mmHg. Corresponding values for the legs during maximal exercise were 48.3 (SD 13.0) ml x [min.sup.-1]. mm[Hg.sup.-1] and 33.8 (SD 2.6) mmHg, respectively. Because conditions for [O.sub.2] off-loading from the hemoglobin are similar in leg and arm muscles, the observed differences in maximal arm and leg [O.sub.2] extraction should be attributed to other factors, such as a higher heterogeneity in blood flow distribution, shorter mean transit time, smaller diffusing area, and larger diffusing distance, in arms than in legs. diffusing capacity; fatigue; oxygen extraction; performance; training

Published
2005

7. Leg and arm lactate and substrate kinetics during exercise

Author

Van Hall, G., Jensen-Urstad, M., Rosdahl, H., Holmberg, H.-C., Saltin, B., and Calbet, J.A.L.

Subjects
Exercise -- Physiological aspects, Muscles -- Physiological aspects, Biological sciences
Abstract

To study the role of muscle mass and muscle activity on lactate and energy kinetics during exercise, whole body and limb lactate, glucose, and fatty acid fluxes were determined in six elite cross-country skiers during roller-skiing for 40 min with the diagonal stride (Continuous Arm + Leg) followed by 10 min of double poling and diagonal stride at 72-76% maximal [O.sub.2] uptake. A high lactate appearance rate ([R.sub.a] 184 [+ or -] 17 [micro]mol*[kg.sup.-1]*[min.sup.-1]) but a low arterial lactate concentration (~2.5 mmol/l) were observed during Continuous Arm + Leg despite a substantial net lactate release by the arm of ~2.1 mmol/min, which was balanced by a similar net lactate uptake by the leg. Whole body and limb lactate oxidation during Continuous Arm + Leg was ~45% at rest and ~95% of disappearance rate and limb lactate uptake, respectively. Limb lactate kinetics changed multiple times when exercise mode was changed. Whole body glucose and glycerol turnover was unchanged during the different skiing modes; however, limb net glucose uptake changed severalfold. In conclusion, the arterial lactate concentration can be maintained at a relatively low level despite high lactate [R.sub.a], during exercise with a large muscle mass because of the large capacity of active skeletal muscle to take up lactate, which is tightly correlated with lactate delivery. The limb lactate uptake during exercise is oxidized at rates far above resting oxygen consumption, implying that lactate uptake and subsequent oxidation are also dependent on an elevated metabolic rate. The relative contribution of whole body and limb lactate oxidation is between 20 and 30% of total carbohydrate oxidation at rest and during exercise under the various conditions. Skeletal muscle can change its limb net glucose uptake severalfold within minutes, causing a redistribution of the available glucose because whole body glucose turnover was unchanged. lactate dehydrogenase; cross-country skiing; tracers

Published
2003

10. Cryoablation as standard treatment of atrial flutter: a prospective, 2-center study (CASTAF)

Author

Bastani, H., primary, Bourke, T., additional, Braunschweig, F., additional, Drca, N., additional, Gudmundsson, K., additional, Insulander, P., additional, Jemtren, A., additional, Kennebäck, G., additional, Ljungström, E., additional, Sadigh, B., additional, Saluveer, O., additional, Scheel, S., additional, Schwieler, J., additional, Tapanainen, J., additional, and Jensen-Urstad, M., additional

Published
2020
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12. Superselective endovascular tissue access using trans-vessel wall technique : feasibility study for treatment applications in heart, pancreas and kidney in swine

Author

Grankvist, R., Jensen-Urstad, M., Clarke, J., Lehtinen, M., Little, P., Lundberg, J., Arnberg, F., Jonsson, Stefan, Chien, K. R., Holmin, S., Grankvist, R., Jensen-Urstad, M., Clarke, J., Lehtinen, M., Little, P., Lundberg, J., Arnberg, F., Jonsson, Stefan, Chien, K. R., and Holmin, S.

Abstract

Objectives. With the emergence of targeted cell transplantation and gene therapy, there is a need for minimally invasive tissue access to facilitate delivery of therapeutic substrate. The objective of this study was to demonstrate the suitability of an endovascular device which is able to directly access tissue and deliver therapeutic agent to the heart, kidney and pancreas without need to seal the penetration site. Methods. In vivo experiments were performed in 30 swine, including subgroups with follow-up to evaluate complications. The previously described trans-vessel wall (VW) device was modified to be sharper and not require tip detachment to seal the VW. Injections into targets in the heart (n = 13, 24-h follow-up n = 5, 72-h follow-up n = 3), kidney (n = 8, 14-day follow-up n = 3) and pancreas (n = 5) were performed. Some animals were used for multiple organ injections. Follow-up consisted of clinical monitoring, angiography and necropsy. Transvenous (in heart) and transarterial approaches (in heart, kidney and pancreas) were used. Injections were targeted towards the subepicardium, endomyocardium, pancreas head and tail, and kidney subcapsular space and cortex. Results. Injections were successful in target organs, visualized by intraparenchymal contrast on fluoroscopy and by necropsy. No serious complications (defined as heart failure or persistent arrhythmia, haemorrhage requiring treatment or acute kidney injury) were encountered over a total of 157 injections. Conclusions. The trans-VW device can achieve superselective injections to the heart, pancreas and kidney for delivery of therapeutic substances without tip detachment. All parts of these organs including the subepicardium, pancreas tail and renal subcapsular space can be efficiently reached., QC 20190426

Published
2019
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13. Muscle mass and inspired oxygen influence oxygen extraction at maximal exercise : role of mitochondrial oxygen affinity.

Author

Cardinale, Daniele A., Larsen, Filip J, Jensen-Urstad, M, Rullman, E, Søndergaard, H, Morales-Alamo, D, Ekblom, Björn, Calbet, J A L, Boushel, Robert, Cardinale, Daniele A., Larsen, Filip J, Jensen-Urstad, M, Rullman, E, Søndergaard, H, Morales-Alamo, D, Ekblom, Björn, Calbet, J A L, and Boushel, Robert

Abstract

AIM:We examined the Fick components together with mitochondrial O2 affinity (p50mito ) in defining O2 extraction and O2 uptake during exercise with large and small muscle mass during normoxia (NORM) and hyperoxia (HYPER). METHODS:Seven individuals performed two incremental exercise tests to exhaustion on a bicycle ergometer (BIKE) and two on a one-legged knee extension ergometer (KE) in NORM or HYPER. Leg blood flow and VO2 were determined by thermodilution and the Fick method. Maximal ADP-stimulated mitochondrial respiration (OXPHOS) and p50mito were measured ex vivo in isolated mitochondria. Mitochondrial excess capacity in the leg was determined from OXPHOS in permeabilized fibers and muscle mass measured with magnetic resonance imaging in relation to peak leg O2 delivery. RESULTS:The ex vivo p50mito increased from 0.06±0.02 to 0.17±0.04 kPa with varying substrate supply and O2 flux rates from 9.84±2.91 to 16.34±4.07 pmol O2 ·s-1 ·μg-1 respectively. O2 extraction decreased from 83% in BIKE to 67% in KE as a function of a higher O2 delivery, and lower mitochondrial excess capacity. There was a significant relationship between O2 extraction and mitochondrial excess capacity and p50mito that was unrelated to blood flow and mean transit time. CONCLUSION:O2 extraction varies with mitochondrial respiration rate, p50mito and O2 delivery. Mitochondrial excess capacity maintains a low p50mito which enhances O2 diffusion from microvessels to mitochondria during exercise. This article is protected by copyright. All rights reserved.

Published
2019
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36. P888Cryoablation as standard treatment of atrial flutter (CASTAF)

Author

Bastani, H., primary, Bourke, T., additional, Braunschweig, F., additional, Drca, N., additional, Gudmundsson, K., additional, Insulander, P., additional, Jemtren, A., additional, Kenneback, G., additional, Ljungstrom, E., additional, Sadigh, B., additional, Saluveer, O., additional, Scheel, S., additional, Schwieler, J., additional, Tapanainen, J., additional, and Jensen-Urstad, M., additional

Published
2017
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40. Why do the arms extract less oxygen than the legs during exercise?

Author

Calbet, J, Holmberg, Hans-Christer, Rosdahl, H, van Hall, G, Jensen-Urstad, M, Saltin, Bengt, Calbet, J, Holmberg, Hans-Christer, Rosdahl, H, van Hall, G, Jensen-Urstad, M, and Saltin, Bengt

Abstract

To determine whether conditions for O2 utilization and O2 off-loading from the hemoglobin are different in exercising arms and legs, six cross-country skiers participated in this study. Femoral and subclavian vein blood flow and gases were determined during skiing on a treadmill at 76% maximal O2 uptake (O2 max) and at O2 max with different techniques: diagonal stride (combined arm and leg exercise), double poling (predominantly arm exercise), and leg skiing (predominantly leg exercise). The percentage of O2 extraction was always higher for the legs than for the arms. At maximal exercise (diagonal stride), the corresponding mean values were 93 and 85% (n = 3; P < 0.05). During exercise, mean arm O2 extraction correlated with the PO2 value that causes hemoglobin to be 50% saturated (P50: r = 0.93, P < 0.05), but for a given value of P50, O2 extraction was always higher in the legs than in the arms. Mean capillary muscle O2 conductance of the arm during double poling was 14.5 (SD 2.6) ml·min–1·mmHg–1, and mean capillary PO2 was 47.7 (SD 2.6) mmHg. Corresponding values for the legs during maximal exercise were 48.3 (SD 13.0) ml·min–1·mmHg–1 and 33.8 (SD 2.6) mmHg, respectively. Because conditions for O2 off-loading from the hemoglobin are similar in leg and arm muscles, the observed differences in maximal arm and leg O2 extraction should be attributed to other factors, such as a higher heterogeneity in blood flow distribution, shorter mean transit time, smaller diffusing area, and larger diffusing distance, in arms than in legs. diffusing capacity; fatigue; oxygen extraction; performance; training

Published
2005
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41. Why do arms extract less oxygen than legs during exercise?

Author

Calbet, J A L, Holmberg, H-C, Rosdahl, H, Van Hall, Gerrit, Jensen-Urstad, M, Saltin, B, Calbet, J A L, Holmberg, H-C, Rosdahl, H, Van Hall, Gerrit, Jensen-Urstad, M, and Saltin, B

Abstract

Udgivelsesdato: 2005-Nov, To determine whether conditions for O2 utilization and O2 off-loading from the hemoglobin are different in exercising arms and legs, six cross-country skiers participated in this study. Femoral and subclavian vein blood flow and gases were determined during skiing on a treadmill at approximately 76% maximal O2 uptake (V(O2)max) and at V(O2)max with different techniques: diagonal stride (combined arm and leg exercise), double poling (predominantly arm exercise), and leg skiing (predominantly leg exercise). The percentage of O2 extraction was always higher for the legs than for the arms. At maximal exercise (diagonal stride), the corresponding mean values were 93 and 85% (n = 3; P < 0.05). During exercise, mean arm O2 extraction correlated with the P(O2) value that causes hemoglobin to be 50% saturated (P50: r = 0.93, P < 0.05), but for a given value of P50, O2 extraction was always higher in the legs than in the arms. Mean capillary muscle O2 conductance of the arm during double poling was 14.5 (SD 2.6) ml.min(-1).mmHg(-1), and mean capillary P(O2) was 47.7 (SD 2.6) mmHg. Corresponding values for the legs during maximal exercise were 48.3 (SD 13.0) ml.min(-1).mmHg(-1) and 33.8 (SD 2.6) mmHg, respectively. Because conditions for O2 off-loading from the hemoglobin are similar in leg and arm muscles, the observed differences in maximal arm and leg O2 extraction should be attributed to other factors, such as a higher heterogeneity in blood flow distribution, shorter mean transit time, smaller diffusing area, and larger diffusing distance, in arms than in legs.

Published
2005

43. Maximal vascular conductances during whole body upright exercise in humans

Author

Calbet, J, Jensen-Urstad, M, van Hall, G, Holmberg, Hans-Christer, Rosdahl, H, Saltin, Bengt, Calbet, J, Jensen-Urstad, M, van Hall, G, Holmberg, Hans-Christer, Rosdahl, H, and Saltin, Bengt

Abstract

That muscular blood flow may reach 2.5 l kg�1 min�1 in the quadriceps muscle has led to the suggestion that muscular vascular conductance must be restrained during whole body exercise to avoid hypotension. The main aim of this study was to determine the maximal arm and leg muscle vascular conductances (VC) during leg and arm exercise, to find out if the maximal muscular vasodilatory response is restrained during maximal combined arm and leg exercise. If during maximal exercise arms and legs had been vasodilated to the observed maximal levels then mean arterial pressure would have dropped at least to 75�77 mmHg in our experimental conditions. It is concluded that skeletal muscle vascular conductance is restrained during whole body exercise in the upright position to avoid hypotension. AVKORTAT ABSTRACT

Published
2004
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44. Maximal muscular vascular conductances during whole body upright exercise in humans

Author

Calbet, J A L, Jensen-Urstad, M, Van Hall, Gerrit, Holmberg, H-C, Rosdahl, H, Saltin, B, Calbet, J A L, Jensen-Urstad, M, Van Hall, Gerrit, Holmberg, H-C, Rosdahl, H, and Saltin, B

Abstract

Udgivelsesdato: 2004-Jul-1, That muscular blood flow may reach 2.5 l kg(-1) min(-1) in the quadriceps muscle has led to the suggestion that muscular vascular conductance must be restrained during whole body exercise to avoid hypotension. The main aim of this study was to determine the maximal arm and leg muscle vascular conductances (VC) during leg and arm exercise, to find out if the maximal muscular vasodilatory response is restrained during maximal combined arm and leg exercise. Six Swedish elite cross-country skiers, age (mean +/-s.e.m.) 24 +/- 2 years, height 180 +/- 2 cm, weight 74 +/- 2 kg, and maximal oxygen uptake (VO(2,max)) 5.1 +/- 0.1 l min(-1) participated in the study. Femoral and subclavian vein blood flows, intra-arterial blood pressure, cardiac output, as well as blood gases in the femoral and subclavian vein, right atrium and femoral artery were determined during skiing (roller skis) at approximately 76% of VO(2,max) and at VO(2,max) with different techniques: diagonal stride (combined arm and leg exercise), double poling (predominantly arm exercise) and leg skiing (predominantly leg exercise). During submaximal exercise cardiac output (26-27 l min(-1)), mean blood pressure (MAP) (approximately 87 mmHg), systemic VC, systemic oxygen delivery and pulmonary VO2(approximately 4 l min(-1)) attained similar values regardless of exercise mode. The distribution of cardiac output was modified depending on the musculature engaged in the exercise. There was a close relationship between VC and VO2 in arms (r= 0.99, P < 0.001) and legs (r= 0.98, P < 0.05). Peak arm VC (63.7 +/- 5.6 ml min(-1) mmHg(-1)) was attained during double poling, while peak leg VC was reached at maximal exercise with the diagonal technique (109.8 +/- 11.5 ml min(-1) mmHg(-1)) when arm VC was 38.8 +/- 5.7 ml min(-1) mmHg(-1). If during maximal exercise arms and legs had been vasodilated to the observed maximal levels then mean arterial pressure would have dropped at least to 75-77 mmHg in our experimental con

Published
2004

45. Poster Session 2

Author

Andersson, T., primary, Magnusson, A., additional, Bryngelsson, I.- L., additional, Frobert, O., additional, Henriksson, K. M., additional, Edvardsson, N., additional, Poci, D., additional, Polovina, M., additional, Potpara, T., additional, Licina, M., additional, Mujovic, N., additional, Kocijancic, A., additional, Simic, D., additional, Ostojic, M. C., additional, Providencia, R. A., additional, Botelho, A., additional, Trigo, J., additional, Nascimento, J., additional, Quintal, N., additional, Mota, P., additional, Leitao-Marques, A. M., additional, Bosch, R. F., additional, Kirch, W., additional, Rosin, L., additional, Willich, S. N., additional, Pittrow, D., additional, Bonnemeier, H., additional, Valenza, M. C., additional, Martin, L., additional, Munoz Casaubon, T., additional, Valenza, G., additional, Botella, M., additional, Serrano, M., additional, Valenza, B., additional, Cabrera, I., additional, Anderson, K., additional, Benzaquen, B. S., additional, Koziolova, N., additional, Nikonova, J., additional, Shilova, Y., additional, Scherr, D., additional, Narayan, S., additional, Wright, M., additional, Krummen, D., additional, Jadidi, A., additional, Jais, P., additional, Haissaguerre, M., additional, Hocini, M., additional, Hunter, R., additional, Liu, Y., additional, Lu, Y., additional, Wang, W., additional, Schilling, R. J., additional, Bernstein, S., additional, Wong, B., additional, Rooke, R., additional, Vasquez, C., additional, Shah, R., additional, Rosenberg, S., additional, Chinitz, L., additional, Morley, G., additional, Bashir Choudhary, M., additional, Holmqvist, F., additional, Carlson, J., additional, Nilsson, H.- J., additional, Platonov, P. G., additional, Jadidi, A. S., additional, Cochet, H., additional, Miyazaki, S., additional, Shah, A. J., additional, Marrouche, N., additional, Calvo, N., additional, Nadal, M., additional, Andreu, D., additional, Tamborero, D., additional, Diaz, F. E., additional, Berruezo, A., additional, Brugada, J., additional, Mont, L., additional, Fichtner, S., additional, Hessling, G., additional, Estner, H. L., additional, Jilek, C., additional, Reents, T., additional, Ammar, S., additional, Wu, J., additional, Deisenhofer, I., additional, Nakanishi, H., additional, Kashiwase, K., additional, Hirata, A., additional, Wada, M., additional, Ueda, Y., additional, Skoda, J., additional, Neuzil, P., additional, Popelova, J., additional, Petru, J., additional, Sediva, L., additional, Reddy, V. Y., additional, Uldry, L., additional, Forclaz, A., additional, Virag, N., additional, Vesin, J.- M., additional, Kappenberger, L., additional, Sehra, R., additional, Briggs, C., additional, Rappel, W.- J., additional, Janotka, M., additional, Chovanec, M., additional, Yamashiro, K., additional, Takami, K., additional, Sakamoto, Y., additional, Satoh, K., additional, Suzuki, T., additional, Nakagawa, H., additional, Romanov, A., additional, Pokushalov, E., additional, Artemenko, S., additional, Shabanov, V., additional, Stenin, I., additional, Elesin, D., additional, Turov, A., additional, Yakubov, A., additional, Hioki, M., additional, Matsuo, S., additional, Ito, K., additional, Narui, R., additional, Yamashita, S., additional, Sugimoto, K., additional, Yoshimura, M., additional, Yamane, T., additional, Di Biase, L., additional, Gallinghouse, J. D., additional, Rajappan, K., additional, Kautzner, J., additional, Dello Russo, A., additional, Tondo, C., additional, Lorgat, F., additional, Natale, A., additional, Balta, O., additional, Buenz, K., additional, Paessler, M., additional, Anders, H., additional, Horlitz, M., additional, Deneke, T., additional, Lickfett, L., additional, Liberman, I., additional, Linhart, M., additional, Andrie, R., additional, Mittmann-Braun, E., additional, Stockigt, F., additional, Nickenig, G., additional, Schrickel, J., additional, Tilz, R., additional, Rillig, A., additional, Feige, B., additional, Metzner, A., additional, Fuernkranz, A., additional, Burchard, A., additional, Wissner, E., additional, Ouyang, F., additional, Betts, T. R., additional, Jones, M. A., additional, Wong, K. C. K., additional, Qureshi, N., additional, Bashir, Y., additional, Corbucci, G., additional, Losik, D., additional, Selina, V., additional, Crandall, M. A., additional, Daniels, C., additional, Daoud, E., additional, Kalbfleisch, S., additional, Yamaji, H., additional, Murakami, T., additional, Kawamura, H., additional, Murakami, M., additional, Hina, K., additional, Kusachi, S., additional, Dakos, G., additional, Vassilikos, V., additional, Paraskevaidis, S., additional, Mantziari, A., additional, Theophylogiannakos, S., additional, Chouvarda, I., additional, Chatzizisis, I., additional, Styliadis, I., additional, Kimura, T., additional, Fukumoto, K., additional, Nishiyama, N., additional, Aizawa, Y., additional, Fukuda, Y., additional, Sato, T., additional, Miyoshi, S., additional, Takatsuki, S., additional, Navarrete Casas, A. J., additional, Ali, I., additional, Conte, F. C., additional, Moran, M., additional, Graham, B. G., additional, Kalejs, O., additional, Lacis, R., additional, Stradins, P., additional, Koris, A., additional, Putnins, I., additional, Vikmane, M., additional, Lejnieks, A., additional, Erglis, A., additional, Estrada, A., additional, Perez Silva, A., additional, Castrejon, S., additional, Doiny, D., additional, Merino, J. L., additional, Baranchuk, A., additional, Greiss, I., additional, Simpson, C. S., additional, Abdollah, H., additional, Redfearn, D. P., additional, Buys-Topart, M., additional, Nitzsche, R., additional, Thibault, B., additional, Kathan, S., additional, Kolb, C., additional, Reif, S., additional, Schade, S., additional, Taggeselle, J., additional, Frey, A., additional, Birkenhagen, A., additional, Kohler, S., additional, Schmidt, M., additional, Cano Perez, O., additional, Buendia, F., additional, Igual, B., additional, Osca, J. M., additional, Sanchez, J. M., additional, Sancho-Tello, M. J., additional, Olague, J. M., additional, Salvador, A., additional, Tolosana, J. M., additional, Fernandez-Armenta, J., additional, Matas, M., additional, Barbarin, M. C., additional, Habibovic, M., additional, Van Den Broek, K. C., additional, Theuns, D. A. M. J., additional, Jordaens, L., additional, Alings, M., additional, Van Der Voort, P. H., additional, Pedersen, S. S., additional, Pupita, G., additional, Molini, S., additional, Brambatti, M., additional, Capucci, A., additional, Molodykh, S., additional, Idov, E. M., additional, Belyaev, O. V., additional, Segreti, L., additional, Soldati, E., additional, Zucchelli, G., additional, Di Cori, A., additional, Viani, S., additional, Paperini, L., additional, De Lucia, R., additional, Bongiorni, M. G., additional, Binner, L., additional, Taborsky, M., additional, Bello, D., additional, Heuer, H., additional, Ramza, B., additional, Jenniskens, I., additional, Johnson, W. B., additional, Silvetti, M. S., additional, Rava', L., additional, Russo, M. S., additional, Di Mambro, C., additional, Ammirati, A., additional, Gimigliano, G., additional, Prosperi, M., additional, Drago, F., additional, Santos, A. R., additional, Picarra, B., additional, Semedo, P., additional, Dionisio, P., additional, Matos, R., additional, Leitao, M., additional, Jacinto, A., additional, Trinca, M., additional, Mazzone, P., additional, Ciconte, G., additional, Marzi, A., additional, Paglino, G., additional, Vergara, P., additional, Sora, N., additional, Gulletta, S., additional, Della Bella, P., additional, Koppitz, P., additional, Fach, A., additional, Hobbiesiefken, S., additional, Fiehn, E., additional, Hambrecht, R., additional, Sperzel, J., additional, Jung, M., additional, Schmitt, J., additional, Pajitnev, D., additional, Burger, H., additional, Goebel, G., additional, Ehrlich, W., additional, Walther, T., additional, Ziegelhoeffer, T., additional, Vancura, V., additional, Wichterle, D., additional, Melenovsky, V., additional, Glikson, M., additional, Goldenberg, G., additional, Segev, A., additional, Dvir, D., additional, Kuzniec, J., additional, Finkelstein, A., additional, Hay, I., additional, Guetta, V., additional, Choo, W. K., additional, Gupta, S., additional, Kirkfeldt, R., additional, Johansen, J., additional, Nohr, E., additional, Moller, M., additional, Arnsbo, P., additional, Nielsen, J., additional, Banha, M., additional, Stojanov, P., additional, Raspopovic, S., additional, Vasic, D., additional, Savic, D., additional, Nikcevic, G., additional, Jovanovic, V., additional, Defaye, P., additional, Mondesert, B., additional, Mbaye, A., additional, Cassagneau, R., additional, Gagniere, V., additional, Jacon, J., additional, Sanfins, V., additional, Reis, H. R., additional, Nobre, J. N., additional, Martins, V. M., additional, Duarte, L. D., additional, Morais, C. M., additional, Conceicao, J. C., additional, Hero, M., additional, Rey, J. L., additional, Ducharme, A., additional, Simpson, C., additional, Stuglin, C., additional, Blier, L., additional, Senaratne, M., additional, Khaykin, Y., additional, Pinter, A., additional, Mlynarska, A., additional, Mlynarski, R., additional, Sosnowski, M., additional, Wilczek, J., additional, Iorgulescu, C., additional, Bogdan, S., additional, Constantinescu, D., additional, Caldararu, C., additional, Dorobantu, M., additional, Radu, A., additional, Vatasescu, R.- G., additional, Yusu, S., additional, Ikeda, T., additional, Mera, H., additional, Miwa, Y., additional, Abe, A., additional, Miyakoshi, M., additional, Tsukada, T., additional, Yoshino, H., additional, Nayar, V., additional, Cantelon, P., additional, Rawling, A., additional, Belham, M. R. D., additional, Pugh, P. J., additional, Osca Asensi, J., additional, Cano, O., additional, Tejada, D., additional, Munoz, B., additional, Rodriguez, M., additional, Olague, J., additional, Wecke, L., additional, Van Hunnik, A., additional, Thompson, T., additional, Di Carlo, L., additional, Zdeblick, M., additional, Auricchio, A., additional, Prinzen, F., additional, Doltra Magarolas, A., additional, Bijnens, B., additional, Silva, E., additional, Penela, D., additional, Sitges, M., additional, Ofman, P., additional, Navaravong, L., additional, Leng, J., additional, Peralta, A., additional, Hoffmeister, P., additional, Levine, R., additional, Cook, J., additional, Stoenescu, M., additional, Tettamanti, M. E., additional, Revilla Orodea, A., additional, Lopez Diaz, J., additional, De La Fuente Galan, L., additional, Arnold, R., additional, Garcia Moran, E., additional, San Roman Calvar, J. 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Published
2011
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47. Leg and arm lactate and substrate kinetics during exercise

Author

Van Hall, G, Jensen-Urstad, M, Rosdahl, H, Holmberg, Hans-Christer, Saltin, Bengt, Calbet, JA, Van Hall, G, Jensen-Urstad, M, Rosdahl, H, Holmberg, Hans-Christer, Saltin, Bengt, and Calbet, JA

Abstract

To study the role of muscle mass and muscle activity on lactate and energy kinetics during exercise, whole body and limb lactate, glucose, and fatty acid fluxes were determined in six elite cross-country skiers during roller-skiing for 40 min with the diagonal stride (Continuous Arm + Leg) followed by 10 min of double poling and diagonal stride at 72-76% maximal O(2) uptake. A high lactate appearance rate (R(a), 184 +/- 17 micromol x kg(-1) x min(-1)) but a low arterial lactate concentration ( approximately 2.5 mmol/l) were observed during Continuous Arm + Leg despite a substantial net lactate release by the arm of approximately 2.1 mmol/min, which was balanced by a similar net lactate uptake by the leg. Whole body and limb lactate oxidation during Continuous Arm + Leg was approximately 45% at rest and approximately 95% of disappearance rate and limb lactate uptake, respectively. Limb lactate kinetics changed multiple times when exercise mode was changed. Whole body glucose and glycerol turnover was unchanged during the different skiing modes; however, limb net glucose uptake changed severalfold. In conclusion, the arterial lactate concentration can be maintained at a relatively low level despite high lactate R(a) during exercise with a large muscle mass because of the large capacity of active skeletal muscle to take up lactate, which is tightly correlated with lactate delivery. The limb lactate uptake during exercise is oxidized at rates far above resting oxygen consumption, implying that lactate uptake and subsequent oxidation are also dependent on an elevated metabolic rate. The relative contribution of whole body and limb lactate oxidation is between 20 and 30% of total carbohydrate oxidation at rest and during exercise under the various conditions. Skeletal muscle can change its limb net glucose uptake severalfold within minutes, causing a redistribution of the available glucose because whole body glucose turnover was unchanged.

Published
2003
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48. Leg and arm lactate and substrate kinetics during exercise

Author

Van Hall, Gerrit, Jensen-Urstad, M, Rosdahl, H, Holmberg, H-C, Saltin, B, Calbet, J A L, Van Hall, Gerrit, Jensen-Urstad, M, Rosdahl, H, Holmberg, H-C, Saltin, B, and Calbet, J A L

Abstract

Udgivelsesdato: 2003-Jan, To study the role of muscle mass and muscle activity on lactate and energy kinetics during exercise, whole body and limb lactate, glucose, and fatty acid fluxes were determined in six elite cross-country skiers during roller-skiing for 40 min with the diagonal stride (Continuous Arm + Leg) followed by 10 min of double poling and diagonal stride at 72-76% maximal O(2) uptake. A high lactate appearance rate (R(a), 184 +/- 17 micromol x kg(-1) x min(-1)) but a low arterial lactate concentration ( approximately 2.5 mmol/l) were observed during Continuous Arm + Leg despite a substantial net lactate release by the arm of approximately 2.1 mmol/min, which was balanced by a similar net lactate uptake by the leg. Whole body and limb lactate oxidation during Continuous Arm + Leg was approximately 45% at rest and approximately 95% of disappearance rate and limb lactate uptake, respectively. Limb lactate kinetics changed multiple times when exercise mode was changed. Whole body glucose and glycerol turnover was unchanged during the different skiing modes; however, limb net glucose uptake changed severalfold. In conclusion, the arterial lactate concentration can be maintained at a relatively low level despite high lactate R(a) during exercise with a large muscle mass because of the large capacity of active skeletal muscle to take up lactate, which is tightly correlated with lactate delivery. The limb lactate uptake during exercise is oxidized at rates far above resting oxygen consumption, implying that lactate uptake and subsequent oxidation are also dependent on an elevated metabolic rate. The relative contribution of whole body and limb lactate oxidation is between 20 and 30% of total carbohydrate oxidation at rest and during exercise under the various conditions. Skeletal muscle can change its limb net glucose uptake severalfold within minutes, causing a redistribution of the available glucose because whole body glucose turnover was unchanged.

Published
2003

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