Heart rate performance curve during incremental cycle ergometer exercise in healthy young male subjects

Abstract

In 1992 Conconi et al. (20) presented an indirect and noninvasive method for the determination of anaerobic threshold (AnT) in an incremental field test for runners. This noninvasive method for the determination of anaerobic threshold is dependent on the occurrence of a deflection of the heart rate performance curve (HRPC). The aim of our study was to evaluate the degree and direction of the deflection of the HRPC and the relationship of the heart rate threshold (HRT) to the lactate turn point in a group of 227 healthy young subjects (age: 23 +/- 4 yr). The subjects were divided into three groups by means of second degree polynomial fitting (GI: regular deflection, kHR > 0.1; G II: no deflection, 0 < kHR < 0.1; G II: inverse deflection, k < -0.1). No significant differences between the groups were found in the anthropometric data or in the power output and the blood lactate concentration at both the first (LTP1) and second (LTP2) lactate turn points and at maximum performance (Pmax). Using the method of Conconi et al. (20), 85.9% of the subjects showed a "regular" deflection, 6.2% showed no deflection at all, and 7.9% showed even an inverted deflection of the HRPC. An HRT could be obtained in both G I and G III, and power output at HRT was not significantly different in comparison to that at the LTP2. No HRT could be assessed in G II. The heart rate at HRT and the LTP2 were significantly lower in G III compared with G I. The phenomenon of heart rate break point may be attractive in training regulation, but its application is limited because a heart rate deflection cannot be found even in young subjects in some cases.

Determinants of haemostatic risk factors for coronary heart disease in obese children and adolescents

“…The nature and the risk of the experimental procedures were explained in detail and written informed consent was obtained. Within one week after the blood sampling and assessment of routine laboratory parameters, participants underwent an incremental cycle ergometer exercise 22 (ECB PRO Ergometer 850, Tunturi, Austria) starting at 35 W and increasing in increments of 10 ± 15 W every minute until voluntary exhaustion. Power output was calculated as Wakg body-weight, and in order to disentangle power output from FM, in Wakg FFM.…”

The Double-Product-Break-Point Derived from Measurents with a Digital Automatic Sphygmomanometer

“…1) are represented by a third-order regression equation with two inflection points (high and low blood pressures). Previous studies 1,10) have shown that SBP during an exercise tolerance test increases slightly at a small intensity, there tends to increase rapidly when the exercise intensity rises above a certain level, but the increase is suppressed when the blood pressure is excessively elevated. This suppression of the increase is considered to be due to th e excitation of baroreceptors, which are enhanced to inhibit sympathetic nerve activity.…”

“…Therefore, blood pressure monitoring devices that are hardly influenced by body motions and vibrations are used in laboratoies [1][2][3][4][5][6] . However, by our results, we have shown that in an exercise tolerance test, the DPBP can be derived with a portable sphygmomanometer.…”

“…The anaerobic threshold (AT) determined by expired gas analysis and the lactate threshold (LT) obtained by lactate measurement are useful not only for the measurement of physical fitness in athletes but also as indices of health in middle-aged and older individuals, and of optimal exercise intensity in patients with diabetes mellitus, ischemic heart disease, or stroke [1][2][3][4][5][6] . However, these approaches require an expensive expired gas analyzer and frequent blood sampling, and thus are difficult to implement at clinical sites of physical therapy.…”

Effect of Incremental Load of Circulatory Response on Double Product Break Point Detection

“…The anaerobic threshold (AT) determined by expired gas analysis and the lactate threshold (LT) obtained by lactate measurement are useful not only for the measurement of physical fitness in athletes but also as indices of health in middle-aged and older individuals, and of optimal exercise intensity in patients with diabetes mellitus, ischemic heart disease, or stroke [1][2][3] . However, their evaluation require an expensive expired gas analyzer and frequent blood sampling; thus, they are difficult to implement in clinical physical therapy settings.…”