Fourteen sedentary 50- to 55-year-old men were exercised to exhaustion using an incremental treadmill protocol. Mean (±SEM) peak oxygen uptake (V̇O2peak) was 40.5 ± 1.19 ml · kg1 · min−1, and maximum heart rate was 161 ± 4 beats · min−1. Blood lactate concentration was measured regularly to identify the lactate threshold (oxygen consumption at which blood lactate concentration begins to systematically increase). Threshold occurred at 84 ± 2% of V̇O2peak. The absolute lactate value at threshold was 2.9 ± 0.2 mmol · L−1. On a separate occasion, 6 subjects exercised continuously just below their individual lactate thresholds for 25 min without significantly raising their blood lactate levels from the 10th minute to the 25th. The absolute blood lactate level over the last 20 min of the steady-state test averaged 3.7 ± 1.2 mmol · L−1. This value is higher than that elicited at the threshold in the incremental test because of the differing nature of the protocols. It was concluded that although the lactate threshold occurs at a high percentage of V̇O2peak, subjects are still able to sustain exercise at that intensity for 25 min.
Fiona Iredale, Frank Bell and Myra Nimmo
Martin Buchheit, Ben M. Simpson and Mathieu Lacome
, typically ranging from 8 to 16/18 km/h) for threshold assessment may be required for an improved examination. 9 However, as multistage incremental test with repeated blood lactate ([La − ] b ) samplings is time-consuming (likely 1 player at a time, 30 min/player, >10 h to test a full team) and expensive
Ralph Beneke, Tobias G.J. Weber and Renate M. Leithäuser
It is well known that cycling cadences in terms of pedal revolutions per minute (rpm) affect metabolic responses over a wide range of given exercise intensities. 1 – 4 At low exercise intensities, blood lactate concentration (BLC) and respiratory measures are higher at high than at low rpm. As
Pitre C. Bourdon, Sarah M. Woolford and Jonathan D. Buckley
Prescribing training loads for endurance athletes often incorporates the measurement of the blood lactate response to incremental exercise in conjunction with heart rate (HR), oxygen consumption ( V ˙ O 2 ), and exercise intensity, and the subsequent calculation of blood lactate thresholds
Carlos Augusto Kalva-Filho, Argyris Toubekis, Alessandro Moura Zagatto, Adelino Sanchez Ramos da Silva, João Paulo Loures, Eduardo Zapaterra Campos and Marcelo Papoti
the maximal intensity that can be sustained without substantial increases in blood lactate concentrations ([La − ]), indicating that the anaerobic metabolism is not required and the effort may be sustained for several minutes (eg, >30 min) ( 2 , 8 ). On the other hand, exercises performed above the
Pedro L. Valenzuela, Javier S. Morales, Carl Foster, Alejandro Lucia and Pedro de la Villa
The lactate threshold (LT), usually defined as the maximum workload that precedes an exponential rise in blood lactate values during an incremental test, is one of the most popular markers of the so-called anaerobic transition. This marker has been extensively used as a predictor of endurance
Athanasios Kabasakalis, Stefanos Nikolaidis, George Tsalis and Vassilis Mougios
upregulate biochemical markers such as lactate, glucose, cortisol, reduced glutathione (GSH), total antioxidant capacity, and 8-hydroxy-2′-deoxyguanosine. 11 Swimming SIT sets are considered relevant and effective in improving performance in competitive events ranging from 50 to 400 m, as they increase
Ralph Beneke, Volker Schwarz, Renate Leithäuser, Matthias Hütler and Serge P. von Duvillard
Maximal lactate steady state (MLSS) corresponds to the prolonged constant workload whereby the kinetics of blood lactate concentration clearly increases from steady state. Different results of MLSS in children may reflect specific test protocols or definitions. Three methods corresponding to lactate time courses during 20 min (MLSS I), 16 min (MLSS II), and 8 min (MLSS III) of constant submaximal workload were intraindividually compared in 10 boys. At MLSS I, lactate, V̇O2peak, heart rate, and workload were higher (p < .05) than at MLSS II and at MLSS III. The differences between MLSS I, MLSS II, and MLSS III reflect insufficient contribution to lactate kinetics by testing procedures, strongly depending on the lactate time courses during the initial 10 min of constant workload. Previously published divergent results of MLSS in children seem to reflect a methodological effect more than a metabolic change.
Fernando Klitzke Borszcz, Artur Ferreira Tramontin and Vitor Pereira Costa
Maximal lactate steady state (MLSS) is defined as the highest constant intensity of exercise that can be maintained for a longer period without continuous increase in blood lactate concentration ([La − ]), and it is the gold-standard parameter for aerobic evaluation. 1 – 3 MLSS determination is
Peter Pfitzinger and Patty Freedson
Part 1 reviews the literature concerning peak blood lactate responses to exercise in children. After a brief overview of lactate metabolism, an analysis is presented comparing children to adults regarding peak blood lactate concentration. Possible factors accounting for lower blood lactate concentrations during maximal exercise in children are considered.