Journal ArticleDOI
Reproducibility of aerobic and anaerobic thresholds in 20–50 year old men
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TLDR
The poor reproducibility of blood lactate concentration of the AnT confirmed the previous opinion that the fixedBlood lactate levels of 2 and 4 mmol·l−1 are poor indicators of AerT and AnT.Abstract:
The reproducibility of the aerobic (AerT) and the anaerobic (AnT) threshold was studied in 33 men aged 20–50 years. They completed two maximal exercise tests on a bicycle ergometer. The thresholds, as
$$\dot V_{O_2 }$$
(l·min−1), were determined visually by two investigators using both the blood lactate and the respiratory indices. The respiratory variables were measured with a computerized breath-by-breath method; samples of venous blood were drawn every 2nd min and analysed enzymatically for lactate. The reproducibility of the AerT (r=0.94) and of the AnT (r=0.96) were equally good. The AnT can be determined either from blood lactate concentrations (AnTLa) or from ventilatory and gas exchange response (AnTr) during a 2-min incremental exercise test. They both also showed similar reproducibility:r=0.93 for the AnTLa andr=0.95 for the AnTr. The work rate and the measured physiological variables at the AerT and AnT, except for the blood lactacte concentration, were very reproducible. Age did not affect the reproducibility of the thresholds. The poor reproducibility of blood lactate concentration of the AnT confirmed our previous opinion that the fixed blood lactate levels of 2 and 4 mmol·l−1 are poor indicators of AerT and AnT.read more
Citations
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Lactate threshold concepts: how valid are they?
TL;DR: Within this review, LTs are considered valid performance indicators when there are strong linear correlations with (simulated) endurance performance and a close relationship between LT and MLSS indicates validity regarding the prescription of training intensities.
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TL;DR: The present results suggest that even the low-frequency concurrent strength and endurance training leads to interference in explosive strength development mediated in part by the limitations of rapid voluntary neural activation of the trained muscles.
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Methods of prescribing relative exercise intensity: physiological and practical considerations.
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Intermittent runs at the velocity associated with maximal oxygen uptake enables subjects to remain at maximal oxygen uptake for a longer time than intense but submaximal runs
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TL;DR: Comparisons of the times spent at V˙O2max during an interval training programme and during continuous strenuous runs showed that in more than half of the cases the vΔ50 run allowed the subjects to reach V�’ O2max, but the time spent specifically at V-O-2max was much less than that during the alternating low/high intensity exercise protocol.
References
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Journal ArticleDOI
Anaerobic threshold and respiratory gas exchange during exercise.
TL;DR: The I-min incremental work rate test is associated with changes in gas exchange which can be used as sensitive on-line indicators of the AT, thus bypassing the need for measuring arterial lactate or acid-base parameters to indicate anaerobiosis.
Journal ArticleDOI
Perceived exertion : A note on 'history' and methods
TL;DR: Results showed that perceived pedal resistance followed a positively accelerating function with an exponent of 1.6, and a model for inter-individunl comparisons using subjective range as a frame is proposed.
Journal ArticleDOI
The significance of the aerobic-anaerobic transition for the determination of work load intensities during endurance training
W Kindermann,G Simon,J. Keul +2 more
TL;DR: A new arrangement of concepts for the anaerobic and aerobic-anaerobic threshold (as derived from energy metabolism) is suggested, that will make possible the determination of optimal work load intensities during endurance training by regulating heart rate.
Journal ArticleDOI
Anaerobic threshold alterations caused by endurance training in middle-aged men
TL;DR: It is demonstrated that the AT is profoundly influenced by endurance training in previously sedentary middle-aged males and significant decreases occurred in CO2 output, VE, respiratory quotient, and VE/VO2.
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