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- Svensson, M, et al.
(author)
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Effect of Q10 supplementation on tissue Q10 levels and adenine nucleotide catabolism during high-intensity exercise.
- 1999
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In: International Journal of Sport Nutrition. - : Human Kinetics. - 1050-1606. ; 9, s. 166-180
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Journal article (peer-reviewed)abstract
- The aim of the present study was to investigate the concentration of ubiquinone-10 (Q10), at rest, in human skeletal muscle and blood plasma before and after a period of high-intensity training with or without Q10 supplementation. Another aim was to explore whether adenine nucleotide catabolism, lipid peroxidation, and mitochondrial function were affected by Q10 treatment. Seventeen young healthy men were assigned to either a control (placebo) or Q10-supplementation (120 mg/day) group. Q10 supplementation resulted in a significantly higher plasma Q10/total cholesterol level on Days 11 and 20 compared with Day 1. There was no significant change in the concentration of Q10 in skeletal muscle or in isolated skeletal muscle mitochondria in either group. Plasma hypoxanthine and uric acid concentrations increased markedly after each exercise test session in both groups. After the training period, the postexercise increase in plasma hypoxanthine was markedly reduced in both groups, but the response was partially reversed after the recovery period. It was concluded that Q10 supplementation increases the concentration of Q10 in plasma but not in skeletal muscle.
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| 4. |
- Emahazion, Tesfai, et al.
(author)
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Identification of 167 Polymorphisms in 88 Genes from Candidate Neurodegeneration Pathways
- 1999
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In: Gene. - 0378-1119 .- 1879-0038. ; 238:2, s. 315-324
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Journal article (peer-reviewed)abstract
- Catalogs of intra-gene polymorphisms are needed to facilitate wide-ranging candidate gene-based association studies in common complex diseases. With this in mind, we have scanned multiple alignments of expressed sequence tags and of genomic DNA sequences (PCR products from four to eight unrelated individuals) to find polymorphisms in 195 genes putatively involved in neurodegenerative illness (including components of oxidative stress, excitotoxicity, inflammation, apoptosis and aging). This led to the discovery of 167 polymorphisms in 88 genes. These comprised 163 single nucleotide polymorphisms, one insertion/deletion, and three other variations involving more than one base pair. The polymorphisms were distributed in the exons (87), introns (70), and gene flanking regions (10). Of the exonic polymorphisms, 17 would give rise to non-synonymous amino acid substitutions. These findings now provide a valuable resource for association studies in neurodegenerative disorders such as Alzheimer's disease and Parkinson's disease.
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| 5. |
- Larsen, Joacim, et al.
(author)
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Health-related quality of life in women with breast cancer undergoing autologous stem-cell transplantation
- 1996
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In: Cancer Nursing. - : Ovid Technologies (Wolters Kluwer Health). - 0162-220X .- 1538-9804. ; 19:5, s. 368-375
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Journal article (peer-reviewed)abstract
- The functional capacity and the health-related quality of life were investigated in nine women (ages 23-58 years) undergoing high-dose chemotherapy with autologous stem-cell transplantation (ASCT). Data were obtained by using two questionnaires: the Sickness Impact Profile (SIP) and the Swedish Health-Related Quality of Life Questionnaire (SWED-QUAL). The patients answered the questionnaires on three occasions: on admission to the transplant unit, at discharge from the unit, and 7-15 weeks after ASCT. It was found that the women were affected by the treatment in various dimensions of daily life. The transplantation primarily affected their self-rated physical health and functions. Their physical-health status was poorest at the time of discharge. The women's emotional status was found to be poor during the whole study period. The results of the present study indicate that professional nursing is essential for breast cancer patients undergoing ASCT.
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| 6. |
- Tonkonogi, Michail, et al.
(author)
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Mitochondrial function in human skeletal muscle is not impaired by high intensity exercise.
- 1999
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In: Pflügers Archiv. - : Springer Science and Business Media LLC. - 0031-6768 .- 1432-2013. ; 437:4, s. 562-8
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Journal article (peer-reviewed)abstract
- The hypothesis that high-intensity (HI) intermittent exercise impairs mitochondrial function was investigated with different microtechniques in human muscle samples. Ten male students performed three bouts of cycling at 130% of peak O2 consumption (V.O2,peak). Muscle biopsies were taken from the vastus lateralis muscle at rest, at fatigue and after 110 min recovery. Mitochondrial function was measured both in isolated mitochondria and in muscle fibre bundles made permeable with saponin (skinned fibres). In isolated mitochondria there was no change in maximal respiration, rate of adenosine 5'-triphosphate (ATP) production (measured with bioluminescence) and respiratory control index after exercise or after recovery. The ATP production per consumed oxygen (P/O ratio) also remained unchanged at fatigue but decreased by 4% (P<0.05) after recovery. In skinned fibres, maximal adenosine 5'-diphosphate (ADP)-stimulated respiration increased by 23% from rest to exhaustion (P<0.05) and remained elevated after recovery, whereas the respiratory rates in the absence of ADP and at 0.1 mM ADP (submaximal respiration) were unchanged. The ratio between respiration at 0.1 and 1 mM ADP (ADP sensitivity index) decreased at fatigue (P<0.05) but after the recovery period was not significantly different from that at rest. It is concluded that mitochondrial oxidative potential is maintained or improved during exhaustive HI exercise. The finding that the sensitivity of mitochondrial respiration to ADP is reversibly decreased after strenuous exercise may indicate that the control of mitochondrial respiration is altered.
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| 7. |
- Tonkonogi, Michail, et al.
(author)
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Mitochondrial oxidative function in human saponin-skinned muscle fibres : effects of prolonged exercise.
- 1998
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In: Journal of Physiology. - : Wiley. - 0022-3751 .- 1469-7793. ; 510 ( Pt 1), s. 279-86
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Journal article (peer-reviewed)abstract
- 1. The influence of prolonged exhaustive exercise on mitochondrial oxidative function was investigated in ten men. 2. Muscle biopsies were taken before and after exercise and mitochondrial respiration investigated in fibre bundles made permeable by pretreatment with saponin. 3. After exercise, respiration in the absence of ADP increased by 18 % (P < 0.01), but respiration at suboptimal ADP concentration (0.1 mM) and maximal ADP-stimulated respiration (1 mM ADP) remained unchanged. 4. In the presence of creatine (20 mM), mitochondrial affinity for ADP increased markedly and respiration at suboptimal ADP concentration (0.1 mM) was similar (pre-exercise) or higher (post-exercise; P < 0.05) than with 1 mM ADP alone. The increase in respiratory rate with creatine was correlated to the relative type I fibre area (r = 0.84). Creatine-stimulated respiration increased after prolonged exercise (P < 0.01). 5. The respiratory control index (6.8 +/- 0.4, mean +/- s.e.m.) and the ratio between respiration at 0.1 and 1 mM ADP (ADP sensitivity index, 0.63 +/- 0.03) were not changed after exercise. The sensitivity index was negatively correlated to the relative type I fibre area (r = -0.86). 6. The influence of exercise on muscle oxidative function has for the first time been investigated with the skinned-fibre technique. It is concluded that maximal mitochondrial oxidative power is intact or improved after prolonged exercise, while uncoupled respiration is increased. The latter finding may contribute to the elevated post-exercise oxygen consumption. The finding that the sensitivity of mitochondrial respiration for ADP and creatine are related to fibre-type composition indicates intrinsic differences in the control of mitochondrial respiration between fibres.
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