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  • 1
    ISSN: 1439-6327
    Schlagwort(e): 2-Chloropropionate ; Force-velocity test ; Anaerobic power ; Venous plasma lactate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We investigated the effects of a stimulation of pyruvate dehydrogenase (PDH) activity induced by 2-chloropropionate (2-CP) on venous plasma lactate concentration and peak anaerobic power (W an, peak) during periods (6 s) of incremental intense exercise, i.e. a force-velocity (F-ν) test known to induce a marked accumulation of lactate in the blood. TheF-ν test was performed twice by six subjects according to a double-blind randomized crossover protocol: once with placebo and once with 2-CP (43 mg · kg−1 body mass). Blood samples were taken at ingestion of the drug, at 10, 20, and 40 Min into the pretest period, at the end of each period of intense exercise, at the end of each 5-min recovery period, and after completion of theF-ν test at 5, 10, 15, and 30 min. During theF-ν test, venous plasma lactate concentrations with both placebo and 2-CP increased significantly when measured at the end of each period of intense exercise (F = 33.5,P 〈 0.001), and each 5-min recovery period (F = 24.6,P 〈 0.001). Venous plasma lactate concentrations were significantly lower with 2-CP at the end of each recovery period (P 〈 0.01), especially for high braking forces, i.e. 8 kg (P 〈 0.05), 9 kg (P 〈 0.02), and maximal braking force (P 〈 0.05). After completion of theF-ν test, venous plasma lactate concentrations were also significantly lower with 2-CP (P 〈 0.001). The percentage of lactate decrease between 5- and 30-min recovery was significantly higher with 2-CP than with the placebo [59 (SEM 4)% vs 44.6 (SEM 5.5)%,P 〈 0.05]. Furthermore,W an, peak was significantly higher with 2-CP than with the placebo [1016 (SEM 60) W vs 957 (SEM 55) W,P 〈 0.05]. In conclusion, PDH activation by 2-CP attenuated the increase in venous plasma lactate concentration during theF-ν test. Ingestion of 2-CP led to an increasedW an, peak.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    European journal of applied physiology 66 (1993), S. 461-466 
    ISSN: 1439-6327
    Schlagwort(e): Force-velocity test ; Anaerobic power ; Aerobic power ; Maximal oxygen uptake ; Swimmers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The purpose of this investigation was to compare anaerobic and aerobic components measured during arm exercise in sprint and middle-distance swimmers and to investigate whether the peak anaerobic power :peak aerobic power ratio (W an, peak :W aer, peak) was related to specialization for the event and to performance. TheW an, peak force at zero velocity (F 0), and velocity at zero-force (ν0),W aer, peak, peak oxygen uptake ( $$\dot V$$ O2peak), and ventilatory threshold (Th v ) were compared during arm exercise tests in sprint (group I,n = 8) and middle-distance (group II,n = 9) competitive male swimmers. Anaerobic indices were estimated by the force-velocity test, an anaerobic test using incremental braking forces; aerobic indices were measured during an incremental aerobic exercise test (30 W · min−1). TheW an, peak andW aer, peak were greater in group I [828 (SEM 70) W; 236 (SEM 12) W] than in group II [678 (SEM 28) W; 230 (SEM 5) W], but the differences were not significant. There were also no significant differences observed between the mean values ofF 0, ν0, $$\dot V$$ O2peak, and Th v . TheW an, peak:W aer, peak, however, was significantly higher in sprint swimmers (t = 3.08,P 〈 0.01). In seven of the swimmers, who had recently performed both the 100-m and 400-m front crawl, a relationship existed between their swim time and theW an, peak:Waer,peak (100m:r = −0.80,P〈0.05 and 400m:r=+0.75,P〈0.05). In conclusion, during arm-crank exercise, we did not observe significant differences in anaerobic and aerobic components between sprint and middle-distance swimmers. However, the results of the present study demonstrated the usefulness of theW an, peak :W aer, peak in the physiological evaluation of swimmers as it reflects the proportion of anaerobic to aerobic systems involved in the supply of energy.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1439-6327
    Schlagwort(e): Arterio-venous difference ; Lactate ; Force-velocity test
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We investigated the role of the forearm skeletal muscles in the removal of lactate during repeated periods of short-term intensive leg exercise, i.e. a force-velocity (FV) test known to induce a marked accumulation of lactate in the blood. The leg FV test was performed by seven untrained male subjects. Arterial and venous blood samples for determination of arterial ([la−]a) and venous ([la−]v) plasma lactate concentrations were concomitantly taken at rest before the test, during the FV test at the end of each period of intensive exercise just before the 5-min between-sprint recovery period, and after the completion of the test at 2, 4, 6, 8, 10, 15, and 20 min of the final recovery. The arteriovenous difference in concentration for plasma lactate ([la−]a−v) was determined for each blood sample. During the test, [la−]a and [la−]v increased significantly (P 〈 0.001;P 〈 0.001) with significantly higher values for [la−]a (P 〈 0.001). At the onset of the test, [la−]a−v became positive and increased up to a braking force of 6 kg, correlating significantly with [la−]a (r = 0.61,P 〈 0.001) with power (r = 0.58,P 〈 0.001) during the test. At the end of the test, [la−]a, [la−]v and [la−]a−v decreased (P 〈 0.001;P 〈 0.001;P 〈 0.001 respectively) but were still higher than the basal values after 20-min of passive recovery. In conclusion, forearm skeletal muscles would seem to have been involved in the removal of lactate from the blood during the leg FV test, with an increase in lactate uptake proportional to the increase in plasma lactate concentration and power.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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