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Author Marzorati, Mauro ♦ Perini, Renza ♦ Milesi, Stefania ♦ Veicsteinas, Arsenio
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2000
Language English
Subject Domain (in DDC) Social sciences ♦ Sociology & anthropology
Abstract There have been many studies on the effects of isokinetic exercise on muscle performance in training and rehabilitative programmes. On the other hand, the cardiovascular and metabolic responses elicited by this type of exercise have been poorly investigated. This study was specifically designed to describe the relationships, if any, between metabolic and cardiorespiratory responses and power output during maximal intermittent knee isokinetic exercise when a steady state is reached. A group of 18 healthy subjects (10 men and 8 women, age range 25–30 years) were requested to perform at maximal concentric isokinetic knee extensions/flexions 60° · s−1 and 180° · s−1 for 5 min, with a 5-s pause interposed between consecutive repetitions. The power output (W˙) was calculated; before and during the tasks heart rate (f c) and arterial blood pressure (APa) were continuously monitored. Pulmonary ventilation (V˙ E) and oxygen uptake (V˙O2) were measured at the 4th and at the 5th min of exercise and blood lactate concentration at rest and at the 3rd min of recovery. From the 4th to the 5th min only a slight decrease in W˙ was observed, both at 60° · s−1 and 180° · s−1. The V˙O2, V˙ E, f c and APa showed similar values in the last 2 min of exercise, suggesting that a steady state had been reached. The V˙O2 increased linearly as a function of W˙, showing a significantly steeper slope at 60° · s−1 than at 180° · s−1. The f c, in spite of a large interindividual variation, was linearly related to metabolic demand, and was not affected by angular velocity. Systolic and diastolic APa were not related either to V˙O2 or to angular velocity. In conclusion it would appear that the metabolic response to maximal intermittent knee isokinetic exercise resembles that of dynamic exercise. Conversely, the cardiocirculatory responses would seem to reflect a relevant role of the isometric postural component, the importance of which should be carefully evaluated in each subject.
ISSN 14396319
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2000-01-18
Publisher Place Berlin/Heidelberg
e-ISSN 14396327
Journal European Journal of Applied Physiology
Volume Number 81
Issue Number 4
Page Count 6
Starting Page 275
Ending Page 280


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Source: SpringerLink