Prediction of lactate threshold using the modified Conconi test in distance runners

Abstract

This study aimed to examine the validity of the modified Conconi test (CT) to predict lactate threshold (LT) during running. Twelve distance runners randomly performed the modified CT and the incremental test in which LT was determined directly by measuring blood lactate (BLa). Mean values of heart rate (HR) and running speed (RS) at heart rate deflection point (HR DP ) obtained through the modified CT were compared with those at LT. Subsequently, the runners who showed a HR DP in the modified CT performed a 30-min prolonged exercise test (PET) at a RS corresponding to HR DP . During this test, the kinetics of BLa and HR were analyzed to determine whether a steady state in these variables could be attained. We succeeded in identifying HR DP in nine of our runners, whereas the remaining three runners showed entirely linear HR response. In those nine runners, no significant difference was found between HR and RS at HR DP and those at LT. Significant correlation was found between HR at HR DP and HR at LT (r = 0.84, p = 0.005), but RS at HR DP was not significantly correlated with RS at LT (r = 0.63, p = 0.07). All nine runners were able to complete the PET with steady state conditions being achieved for both BLa and HR. In conclusion, these findings indicate that the modified CT has a potential to be used as an alternative method for assessment of LT in distance runners presenting a HR DP .

The Potentiality of Moringa Oleifera to Increase Human Performance

“…Furthermore, other studies reveal that the amount of hemoglobin in the blood is closely related to VO 2 max [23]. On the other hand, previous studies indicated that the administration of Moringa oleifera leaf extract could reduce lactate concentration [18]. This study related to the lactate threshold because decreasing lactic acid concentration will correlate with the lactate threshold.…”

“…PL/PJ.00.00/2022. Sixteen male athletes from West Java, Indonesia, were tested by the Balke test to measure VO 2 max and the modified Conconi test to measure lactate threshold [18]. In order to determine the muscle endurance capacity, the test of push up, sit up, and wall sit was administered to determine hand and shoulder muscle endurance, abdomen muscle endurance, and the extremities of inferior muscle endurance, respectively.…”

Caracterí­sticas da aptidão aeróbia e neuromuscular de praticantes dos projetos de extensão de uma instituição de ensino superior em Campo Grande/MS

“…Ao avaliar corredores treinados de nível regional, Brunetta et al [21] observaram valores para o LAn determinado por meio do ponto de deflexão da FC de 11,4 ± 0,8 km•h-1. Em corredores de elite, Kjertakov et al [22] verificaram um LAn correspondente a 15,6 ± 0,7 km•h-1. Já para homens saudáveis, Nascimento et al [15] encontraram um valor de 9,2 ± 1,3 km•h-1 para o LAn determinado por meio do ponto de deflexão da FC.…”

The complex relationship between effort and heart rate: a hint from dynamic analysis

“…This method, known as the Conconi method, link the lactic accumulation threshold with the HR dynamic change at high energy expenditure, appearing as an inflection point in the HR performance curve. Attractive by its simplicity, this approach suffers from several drawbacks, including a variable reliability 6,7 , the existence of HR performance curve having no inflection points [8][9][10] , and a lack of accuracy 11,12 .…”