Open AccessVentilatory efficiency during constant-load test at lactate threshold intensity: Endurance versus resistance exercises
Author(s) -
Lluís Albesa-Albiol,
Noemí Serra-Payá,
Manuel Vicente Garnacho-Castaño,
Lluis Guirao Cano,
Eulogio Pleguezuelos,
José Luis Maté-Muñoz
Publication year - 2019
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0216824
Subject(s) - cardiorespiratory fitness , cycle ergometer , incremental exercise , intensity (physics) , ventilation (architecture) , blood lactate , ventilatory threshold , heart rate , medicine , squat , physical therapy , cardiology , respiratory exchange ratio , lactate threshold , vo2 max , blood pressure , physics , quantum mechanics , thermodynamics
There is a lack of evidence about the ventilatory efficiency in resistance exercises despite the key role played in endurance exercises. This study aimed to compare the cardiorespiratory, metabolic responses and ventilatory efficiency between half-squat (HS) and cycle ergometer exercises during a constant-load test at the lactate threshold (LT) intensity. Eighteen healthy male participants were randomly assigned in a crossover design to carry out HS or cycle ergometer tests. For the three HS tests, a one repetition maximum (1RM) test was performed first to determine the load (kg) corresponding to the 1RM percentages. In the second test, the incremental HS exercise was carried out to establish the load (kg) at the LT intensity. Finally, a constant-load HS test was performed at the LT intensity. The first cycle ergometer test was incremental loading to determine the intensity in watts corresponding to the LT, followed by a constant-load test at the LT intensity. A recovery time of 48 hours between each test was established. During both constant-load test, cardiorespiratory and metabolic responses were monitored. A significant exercise mode x time interaction effect was only detected in oxygen uptake (VO 2 ), heart rate, and blood lactate (p < 0.001). No differences were found between the two types of exercise in ventilatory efficiency (p >0.05). Ventilation (VE) and carbon dioxide were highly correlated (p <0.001) in the cycle ergometer (r = 0.892) and HS (r = 0.915) exercises. In the VO 2 efficiency slope (OUES), similarly significant and high correlations (p <0.001) were found between VO 2 and log 10 VE in the cycle ergometer (r = 0.875) and in the HS (r = 0.853) exercise. Although the cardioventilatory responses were greater in the cycle ergometer test as compared to HS exercise, ventilatory efficiency was very similar between the two exercise modalities in a predominantly aerobic metabolism.