Cardiorespiratory and metabolic determinants during moderate and high resistance exercise intensities until exhaustion using dynamic leg press: comparison with critical load
Braz. j. med. biol. res
;
51(11): e7837, 2018. tab, graf
Article
Dans Anglais
| LILACS
| ID: biblio-974248
ABSTRACT
The objective of this study was to assess cardiovascular, respiratory, and metabolic responses during a commonly used dynamic leg press resistance exercise until exhaustion (TEx) at different intensities and compare with critical load (CL). This was a prospective, cross-sectional, controlled, and crossover study. Twelve healthy young men (23±2.5 years old) participated. The subjects carried out three bouts of resistance exercise in different percentages of 1 repetition maximum (60, 75, and 90% 1RM) until TEx. CL was obtained by means of hyperbolic model and linearization of the load-duration function. During all bout intensities, oxygen uptake (VO2), carbon dioxide production (VCO2), ventilation (VE), and respiratory exchange ratio (RER) were obtained. Variations (peak-rest=Δ) were corrected by TEx. In addition, systolic and diastolic blood pressure (SBP and DBP), blood lactate concentration [La-] and Borg scores were obtained at the peak and corrected to TEx. CL induced greater TEx as well as number of repetitions when compared to all intensities (P<0.001). During CL, Borg/TEx, ΔSBP/TEx, ΔDBP/TEx, and [La-] were significantly lower compared with 90% load (P<0.0001). In addition, VO2, VCO2, VE, and RER were higher during CL when compared to 90 or 75%. TEx was significantly correlated with VO2 on CL (r=0.73, P<0.05). These findings support the theory that CL constitutes the intensity that can be maintained for a very long time, provoking greater metabolic and ventilatory demand and lower cardiovascular and fatigue symptoms during resistance exercise.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Consommation d'oxygène
/
Échanges gazeux pulmonaires
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Épreuve d'effort
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Entraînement en résistance
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Fatigue
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Rythme cardiaque
Type d'étude:
Essai clinique contrôlé
/
Étude observationnelle
/
Étude de prévalence
/
Étude pronostique
/
Facteurs de risque
Limites du sujet:
Adulte
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2018
Type:
Article
Pays d'affiliation:
Brésil
/
États-Unis d'Amérique
Institution/Pays d'affiliation:
Universidade Federal de São Carlos/BR
/
Universidade de São Paulo/BR
/
University of Illinois/US
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