V. Respiratorischer Quotient und O<sub>2</sub>‐Aufnahme<sup>1</sup>

Christensen, E. Hohwü; Hansen, Ove

doi:10.1111/j.1748-1716.1939.tb01322.x

Cited by 62 publications

(24 citation statements)

References 2 publications

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“…Using R.Q. determinations to quantify the proportions of fats and carbohydrates in energy metabolism has possible sources of error (Christensen & Hansen, 1939;Wahren, Ahlborg, Felig & Jorfeldt, 1971). The finding of a significant net uptake of free fatty acids in the trained leg only, together with a higher release of lactate from the untrained leg, provides, however, evidence that the lower R.Q.…”

Section: Discussioncontrasting

confidence: 42%

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Henriksson¹

1977

The Journal of Physiology

263

161

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SUMMARY1. Six subjects were trained using a one-leg bicycle exercise for 2 months. The untrained leg served as control. After the training period, muscle oxidative capacity, determined as succinate dehydrogenase activity, was 27 % higher in the trained (as opposed to the control) leg (P < 0.05).2. When the subjects in this situation performed a 1 h two-legged submaximal bicycle exercise bout (150-225 W), determinations of VO, of the single leg (leg blood flow x (A-V)02 difference) revealed that they appeared to choose to work harder with their trained than with their untrained leg, so as to make the relative loads for the two legs the same.3. Determinations of 02 and CO2 on femoral arterial and venous blood demonstrated that the R.Q. was lower in the trained as compared to the untrained leg, 0-91 cf. 0-96 (10 min) and 0-91 cf. 0 94 (50 min) (P < 0.05).4. That metabolism of fat was more pronounced in the trained leg was further supported by the finding of a significant net uptake of free fatty acids in this leg only. Moreover, a lower release of lactate from the trained leg was demonstrated.5. It is suggested that the shift towards a more pronounced metabolism of fat in the trained leg is a function of an increased muscle oxidative capacity.

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Section: Discussioncontrasting

confidence: 42%

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Henriksson¹

1977

The Journal of Physiology

263

161

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“…We found no group diVerences for submaximal RER, a parameter which reXects substrate utilization and that generally increases with exercise intensity (Christensen and Hansen 1939;Friedlander et al 1997). These Wndings are relevant when considering that participants with DS walked at higher relative submaximal intensities than the controls.…”

Section: Discussionmentioning

confidence: 94%

Walking economy in male adults with Down syndrome

2008

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The purpose of this study was to investigate walking economy in response to steady-state locomotion in adult males with Down syndrome (DS) and in healthy controls. Twelve participants with DS (34.5 +/- 7.0 years) and 11 non-disabled controls (34.3 +/- 8.7 years) performed submaximal (0% grade, 2.5 km h(-1) for 8 min) and maximal treadmill tests with metabolic and heart-rate measurements. For submaximal walking, submaximal oxygen uptake (VO(2)) (9.1 vs. 9.5 mL kg(-1) min(-1)), net VO(2) (5.9 vs. 5.4 mL kg(-1) min(-1)) were not different between the groups (P > 0.05). However, oxygen-pulse (6.6 vs. 8.6 mL/beat) was lower and relative work intensity (44.6 vs. 19.9% of max) was higher in individuals with DS compared to controls (P < 0.05). Findings indicate similar walking economy between groups. Nevertheless, participants with DS exercised at lower submaximal oxygen-pulse and higher percentage of VO(2peak). Therefore, despite similar walking economy, participants with DS have lower cardiorespiratory function than controls for a given steady-state treadmill speed.

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“…During work at submaximal intensities the increased capillary density could be of importance by enabling a better distribution of blood flow to a local demand. This mechanism could, for example, enhance transport of free fatty acids by shortening the diffusion distance, and thus, together with an increased enzymatic oxidative capacity, contribute to the increased fat (relative to carbohydrate) metabolism observed in endurance trained subjects (Christensen & Hansen, 1939;Hermansen, Hultman & Saltin, 1967), and in the trained leg after onelegged endurance training .…”

Section: Metabolic Significance Of Increased Capillary Densitymentioning

confidence: 99%

Capillary supply of the quadriceps femoris muscle of man: adaptive response to exercise

Andersen¹,

Henriksson²

1977

The Journal of Physiology

660

377

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SUMMARY1. Five subjects trained for 8 weeks on a bicycle ergometer for an average of 40 min/day, four times a week at a work load requiring 80 % of the maximal oxygen uptake (02maX.)-1o2 max. determinations were performed, and muscle biopsies from the quadriceps femoris muscle (vastus lateralis) were taken before, as well as repeatedly during, the training period. The muscle biopsies were histochemically stained for fibre-types (myofibrillar ATPase) and capillaries (amylase-PAS method), and analysed biochemically for succinate dehydrogenase and cytochrome oxidase activities.2. The training programme resulted in a 16% increase in l2max., a 20 % increase in capillary density, a 20 % increase in mean fibre area, and an approximately 40 % increase in the activities of succinate dehydrogenase and cytochrome oxidase.3. The capillary supply to type I, IIA and IIB fibres, expressed as the mean number of capillaries in contact with each fibre-type, relative to fibre-type area, increased equally.4. The present study shows that endurance training constitutes a powerful stimulus for capillary proliferation in human skeletal muscle.

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V. Respiratorischer Quotient und O₂‐Aufnahme¹

Cited by 62 publications

References 2 publications

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Walking economy in male adults with Down syndrome

Capillary supply of the quadriceps femoris muscle of man: adaptive response to exercise

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V. Respiratorischer Quotient und O2‐Aufnahme1

Cited by 62 publications

References 2 publications

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Training induced adaptation of skeletal muscle and metabolism during submaximal exercise

Walking economy in male adults with Down syndrome

Capillary supply of the quadriceps femoris muscle of man: adaptive response to exercise

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V. Respiratorischer Quotient und O₂‐Aufnahme¹