M. Quadriceps femoris of Man, a muscle with an unusual enzyme activity pattern of energy supplying metabolism in mammals

Bass, A; Vondra, K; Rath, R; Vítek, V.

doi:10.1007/bf00584648

Cited by 21 publications

(6 citation statements)

References 18 publications

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“…The muscle enzyme activities in obese young men assessed before fasting revealed a predominantly anaerobic type of energy metabolism in their muscles as compared with the controls and thus confirm our previous conclusions (Vondra, Rath and Bass 1975). The practically unaltered hexokinase activity after fasting suggests that the capacity of glucose phosphorylation is preserved so that its capacity to enter into muscle metabolism is maintained.…”

Section: Discussionsupporting

confidence: 86%

The Effect of Five Days' Fasting on Skeletal Muscle Enzymes in Obese Men

Vondra¹,

Bass²,

Brodan³

et al. 1983

Horm Metab Res

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The effect of 120 hours' (five days) fasting on the activity of some enzymes of energy metabolism in skeletal muscles was investigated in six obese young men. The results revealed a significant decline in the activity of the following enzymes: triosophosphate dehydrogenase (by 20%), glycerol-3-phosphate dehydrogenase (by 24%), lactate dehydrogenase (by 13%), citrate synthase (by 20%), hydroxyacyl-CoA dehydrogenase (by 40%), while the hexokinase and malate dehydrogenase activities were not significantly altered. Contrary to muscles of non-obese healthy men (Vondra, Bass, Brodan, Kuhn, Andĕl, Veselková and Vítek 1982), a smaller decline of activities of the investigated enzymes occurred together with a paradoxical change of the enzyme pattern, namely a predominance of carbohydrate catabolism and a decline of the role of fatty acids in muscle energy metabolism.

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Section: Discussionsupporting

confidence: 86%

The Effect of Five Days' Fasting on Skeletal Muscle Enzymes in Obese Men

Vondra¹,

Bass²,

Brodan³

et al. 1983

Horm Metab Res

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“…Figure 4 illustrates that for a given leg length, OPP is greater in men and the explanation does not appear to be linked to gross structure. Attention is redirected towards muscle function, and it has been reported, for example, that levels of enzyme activity are lower in women, in particular phosphofructokinase (Hedberg and Jansson, 1976;Nygaard, 1981), phosphorylase (Krotkiewski et al, 1980) and lactate dehydrogenase (Bass et al, 1975). During maximal intensity exercise, the effect of such differences on the biochemical characteristics of muscle could have accounted for the performance differences.…”

Section: Discussionmentioning

confidence: 97%

Maximal exercise performance and lean leg volume in men and women

Winter

Brookes

Hamley

1991

Journal of Sports Sciences

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The purpose of this study was to compare the maximal exercise performance during cycle ergometry of 34 men and 47 women. External peak power output (OPP) and optimized pedalling rate (ORPM) were calculated from data gathered during an optimization procedure performed on a friction braked cycle ergometer. In addition, lean leg volume (LLV) and lean upper leg volume (LULV) were determined using an anthropometric technique. Both OPP and ORPM were greater in men than in women (1007 +/- 135 vs 673 +/- 109 W and 119.5 +/- 7.0 vs 104.5 +/- 8.4 rev min-1, respectively; P less than 0.001). The LLV and LULV were also greater in men than in women (7.41 +/- 0.82 vs 5.19 +/- 0.85 l and 4.96 +/- 0.63 vs 3.35 +/- 0.62 l, respectively; P less than 0.001). The ratio standards OPP/LLV and OPP/LULV did not differ significantly between men and women (136.3 +/- 14.7 vs 131.0 +/- 20.6 W l-1 and 204.4 +/- 27.1 vs 204.4 +/- 37.0 W l-1, respectively; P greater than 0.05). Peak power output was related to each of the anthropometric indices in both men and women (LLV:r = 0.614 and 0.527, P less than 0.001; LULV:r = 0.489 and 0.396, P less than 0.01). Analysis of covariance revealed no significant differences between the groups in the variance about regression and the regression coefficients (P greater than 0.05), but the elevation of the regression lines did differ (P less than 0.001). The results suggest that there are differences between maximal exercise performance in men and women that are independent of estimated lean leg volume. They also demonstrate that, in this case, consideration of ratio standards is misleading and that a comparison of regression standards is more appropriate.

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“…The activities of the glycolytic enzyme PFK and the oxidative enzyme SDH are lower than in male subjects (Henriksson & Reitman 1976). The ratio between the activities of the two enzymes shows that the potential for oxidative metabolism is higher in females than in males (Bass et al 1975, Komi & Karlsson 1978, Nikkila et al 1978.…”

Section: Discussionmentioning

confidence: 97%

Skeletal muscle fibre characteristics in young women

Nygaard

1981

Acta Physiologica Scandinavica

107

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Muscle samples were obtained by needle biopsy from the lateral vastus muscle of 54 healthy female subjects, 18 to 40 years of age. 25 subjects were classified as sedentary, 20 as active, and 9 as endurance trained. In 33 of the subjects, the deltoid muscle was biopsied as well. The lateral vastus muscle of runners and the deltoid muscle of swimmers contained 60% slow twitch fibres (ST) an none or few fast twitch b fibres (FTb). Otherwise the percentage of fibre types was 50% ST fibres, 30% to 35% FTa fibres, and 15% to 20% FTb fibres. In the lateral vastus muscle ST fibres wee larger than FT fibres, whereas in male skeletal muscles FT fibres tend to be larger than ST fibres. The capillarization was linearly related to maximal oxygen uptake, as is also the case in male subjects. The activity of biochemically determined phosphofructokinase (PFK) was the same in both muscles and in all groups; succinate dehydrogenase activity (SDH) was closely related to maximal oxygen uptake. Th activities of PFK and SDH were lower than in male subjects the ratio between the activities indicated that the relative contribution of oxidative metabolism was higher than in males. The morphological and biochemical differences between female and male skeletal muscle are found in sedentary and trained subjects, and may be due both to the influence of sex hormones, and to differences in the daily activity pattern.

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M. Quadriceps femoris of Man, a muscle with an unusual enzyme activity pattern of energy supplying metabolism in mammals

Cited by 21 publications

References 18 publications

The Effect of Five Days' Fasting on Skeletal Muscle Enzymes in Obese Men

The Effect of Five Days' Fasting on Skeletal Muscle Enzymes in Obese Men

Maximal exercise performance and lean leg volume in men and women

Skeletal muscle fibre characteristics in young women

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