Cardiovascular System and Physical Exercise

Karpman, V. L.

doi:10.1249/00005768-199207000-00019

Cited by 6 publications

(6 citation statements)

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“…Thus, with this type of exercise it appears that heart rate cannot be used to predict oxygen uptake. Such measurements, which are commonly used in multiple sprints sports, will inevitable overestimate aerobic energy demands (13).…”

Section: Blood Lactatementioning

confidence: 99%

Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

et al. 1992

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Seven male subjects performed 15 x 40m sprints, on three occasions, with rest periods of either 120 s (R120), 60 s (R60) or 30 s (R30) between each sprint. Sprint times were recorded with four photo cells placed at 0, 15, 30 and 40 m. The performance data indicated that whereas running speed over the last 10 m of each sprint decreased in all three protocols (after 11 sprints in R120, 7 sprints in R60 and 3 sprints in R30), performance during the initial acceleration period from 0-15 m was only affected with the shortest rest periods increasing from (mean +/- SEM) 2.58 +/- .03 (sprint 1) to 2.78 +/- .04 s (spring 15) (p < .05). Post-exercise blood lactate concentration was not significantly different in R120 (12.1 +/- 1.3 mmol.l-1) and R60 (13.9 +/- 1.2 mmol.l-1), but a higher concentration was found in R30 (17.2 +/- .7 mmol.l-1) (p < .05). After 6 sprints there was no significant difference in blood lactate concentration with the different recovery durations, however, there were significant differences in sprint times at this point, suggesting that blood lactate is a poor predictor of performance during this type of exercise. Although the work bouts could be classified primarily as anaerobic exercise, oxygen uptake measured during rest periods increased to 52, 57 and 66% of maximum oxygen uptake in R120, R60 and R30, respectively. Evidence of adenine nucleotide degradation was provided by plasma hypoxanthine and uric acid concentrations elevated post-exercise in all three protocols. Post-exercise uric acid concentration was not significantly affected by recovery duration.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Blood Lactatementioning

confidence: 99%

Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

et al. 1992

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“…This becomes more rapid during the initial phase of exercise than in the pretraining period (Hickson et al 1978, Hagberg et al 1980, Yoshida et al 1992. Karpman (1987) recently reported observing larger amplitudes and smaller phase shifts in the heart rate (HR) response to sinusoidal work load in athletes undergoing endurance training than in athletes participating Correspondence : Yoshiyuki Fukuoka, Faculty of Human Life Sciences, Prefectural University of Kumamoto, 2432-1 Kengun Machi, Kumaoto City 862, Japan. in speed-strength sports.…”

mentioning

confidence: 99%

Characterization of sports by the Vo₂ dynamics of athletes in response to sinusoidal work load

Fukuoka

Gwon²,

Sone

et al. 1995

Acta Physiologica Scandinavica

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The purpose of this study was to evaluate the specificity of maximal oxygen uptake (VO2max) and the dynamic response of oxygen uptake (VO2) to sinusoidal work load in distance runners and in American-football players. Sinusoidal work load during ergometer cycling was carried from 30 W to 60% to VO2max (60% VO2max) for a 2 min period. VO2 was measured by the breath-by-breath method. The subjects were 10 distance runners (DRs), 10 American-football players (AFPs), and 11 untrained men (UTM). Mean VO2max was 64.4 mL kg-1 min-1 in the DRs, 53.1 mL kg-1 min-1 in the AFPs and 47.3 mL kg-1 min-1 in the UTM. The fundamental amplitudes of the VO2 response, normalized by dividing by steady state VO2 at 60% VO2max, were similar in the AFPs (20.3%) and the UTM (19.5%), and both were significantly less than in the DRs (25.5%). Phase shift to work load expressed in degrees was similar in the AFPs (87.7 degrees) and UTM (88.0 degrees), but significantly greater than in the DRs (80.4 degrees). HR dynamics in all three groups were similar to a dynamic VO2 response. These findings suggest that development of the dynamic VO2 response and higher VO2max is achieved in the DRs. They also suggest that despite the higher VO2max in the AFPs there is no improvement in the dynamic VO2 response. The results of the present study demonstrate that athletes participating in different sports have characteristic dynamic VO2 responses during cycling exercise.

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“…Therefore, the basis of this approach to determining the functional capabilities of athletes is based on the criteria for evaluating energy systems: creatine phosphate, glycolytic, and aerobic [10,12]. For this purpose, testing to assess energy processes' power, capacity, and efficiency is proposed [11,13]. The physiological basis of energy potential realization is its dependence on the specific integrative activity of motor and vegetative functions, the increase of activating effects of the cerebral cortex, as well as the improvement of neuro-humoral regulation and, on this basis, the optimization of the physiological reactivity of the body systems leading to the type of sports activity.…”

Section: Introductionmentioning

confidence: 99%

“…Under the condition that the issues of sports physiology and medicine are resolved, the problem of ensuring a high level of physical performance comes to the fore. It should be emphasized that in sports physiology, the dynamics of increasing exceptional physical performance are considered not only as an increase in functional reserves but also as a process of integration of various systems to a specific type of muscle activity and improvement of regulation mechanisms [11][12][13]. In addition, the analysis of the adaptation mechanisms of athletes with a high level of fitness can be based on both achieving high performance and adjusting the dynamic characteristics of functional systems, the speed of their deployment, reaching the peak level, and stability, which are the most effective in realizing energy potential.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of the Oxygen Transport System of Elite Athletes With Different Individual and Typological Properties in Their Nervous Systems

Lyzohub,

Pustovalov,

Kozhemiako

et al. 2024

hpc

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Cardiovascular System and Physical Exercise

Cited by 6 publications

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Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

Characterization of sports by the Vo₂ dynamics of athletes in response to sinusoidal work load

Reactivity of the Oxygen Transport System of Elite Athletes With Different Individual and Typological Properties in Their Nervous Systems

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Cardiovascular System and Physical Exercise

Cited by 6 publications

References 0 publications

Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

Maximal-Intensity Intermittent Exercise: Effect of Recovery Duration

Characterization of sports by the Vo2 dynamics of athletes in response to sinusoidal work load

Reactivity of the Oxygen Transport System of Elite Athletes With Different Individual and Typological Properties in Their Nervous Systems

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Characterization of sports by the Vo₂ dynamics of athletes in response to sinusoidal work load