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Lactate Threshold in 50- to 55-Year-Old Men

Fiona Iredale, Frank Bell, and Myra Nimmo

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.

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Evaluating the Effect of the Combat Style Congruency on Performance and Fatigability in Brazilian Jiu-Jitsu: A Pilot Study

Thiago Ferreira Dias Kanthack, Aymeric Guillot, Ismael Simon, and Franck Di Rienzo

Andreato et al, 3 BJJ involves an explosive/static effort duration ratio of ~1:6. There is a general consensus that BJJ combats emphasize glycolytic pathways to supply energy demands. Blood lactate concentrations ranging from 11 to 14 mmol·L −1 are usually reported after combats. 4 – 7 Henceforth, the

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Monitoring Cardiorespiratory Fitness in Professional Soccer Players: Is It Worth the Prick?

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

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The Effects of Maximally Achievable Cycling Cadence on Carbohydrate Management at Moderate and Heavy Exercise Intensity

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

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A Cloth Facemask Causes No Major Respiratory or Cardiovascular Perturbations During Moderate to Heavy Exercise

Natália Mendes Guardieiro, Gabriel Barreto, Felipe Miguel Marticorena, Tamires Nunes Oliveira, Luana Farias de Oliveira, Ana Lucia de Sá Pinto, Danilo Marcelo Leite do Prado, Bryan Saunders, and Bruno Gualano

baseline, at the end of each stage, and 4-minute postexhaustion for the subsequent analysis of lactate. Blood was homogenized in the same volume of 2% NaF; centrifuged at 2000 g for 5 minutes before plasma was removed, and stored at −20 °C until analysis. Plasma lactate was determined

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Physiological Profiling and Energy System Contributions During Simulated Epée Matches in Elite Fencers

Woo-Hwi Yang, Jeong-Hyun Park, Yun-Cheol Shin, and Jun Kim

, submaximal effort, such as those seen with the small bouncing movements, as well as recovery, depend on high use of the aerobic energy system. 1 , 3 , 4 Previous studies have attempted to investigate physiological responses using parameters such as peak oxygen consumption (VO 2 peak), peak blood lactate

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The Effects of an Acute Dose of New Zealand Blackcurrant Extract on 5-km Running Performance

Samantha L. Moss, Edward Brindley, Kevin Enright, Jamie Highton, and Richard Bott

( Cook & Willems, 2019 ). A primary determinant of high-intensity endurance performance is the ability of the cardiovascular system to maintain blood flow to the periphery for oxygen and nutrient delivery, metabolite removal, and lactate shuttling to alternative cells (e.g., the liver, heart, and kidneys

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Electromyographic and Systemic Physiological Thresholds in Single-Joint Elbow Flexion Movements

Markus Tilp, Lukas Kitzberger, Gudrun Schappacher-Tilp, Philipp Birnbaumer, and Peter Hofmann

With increasing exercise intensity during incremental whole-body exercise, 3 different metabolic phases separated by 2 thresholds can be observed. 1 These thresholds can be determined by systemic variables such as heart rate (HR), blood lactate concentration, or ventilation (VE). 2 , 3 Although

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Response of Blood Biomarkers to Sprint Interval Swimming

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

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Acute Mechanical and Metabolic Responses to Different Resistance Training Protocols With Equated Volume Load

Miguel Sánchez-Moreno, Luis Rodiles-Guerrero, Gonçalo Rendeiro-Pinho, António Prieto-Veloso, and Fernando Pareja-Blanco

significantly higher acute decline in physical performance (eg, countermovement jump height or velocity with 75% 1RM) and a higher increase in markers of fatigue (eg, blood lactate, creatine kinase, or ammonia concentrations) when compared with completing the same total volume (ie, 6 × 5 [10]) with a different