title: Discontinuous sets of knee extensions induce higher cardiovascular responses in comparison to continuous ones.
abstract: BACKGROUND
  The strength training can promote significant cardiovascular responses during its performance and it is interesting to devise strategies to reduce them, without compromising the strength production.
  
  
  OBJECTIVE
  To compare the acute cardiovascular responses of systolic arterial pressure (SAP), diastolic arterial pressure (DAP), heart rate (HR) and double product (DP) during the unilateral knee extension (four series of 8 maximum repetitions) performed continuously or discontinuously. Both protocols involved a 2-minute interval between the series and the discontinuous protocol had an extra interval of 2 seconds between the 4th and the 5th repetitions.
  
  
  METHODS
  Eight healthy men trained in muscular strength (aged 26+/- 6 years) participated in the data collection and were randomly divided in two non-consecutive days. The cardiovascular responses were measured by photoplethysmography (Finapres, Ohmeda, Louisville, CO, USA) at rest, at the end of each series and 2 minutes after the performance of each protocol.
  
  
  RESULTS
  The discontinuous series showed significantly higher values when compared to the protocol of the continuous series for: SAP (mmHg) at the 2nd (173.1+/- 5.4 vs 152.0+/- 4.0; p=0.001), 3rd (188.9+/- 8.6 vs 162.4+/- 6.0; p=0.000) and 4th series (193.1+/- 8.1 vs 161.6+/- 5.9; p=0.000); DAP (mmHg) at the 3rd (103.8+/- 4.1 vs 86.1+/- 3.3; p=0.000) and 4th series (104.1+/- 2.7 vs 83.4+/- 3.3; p=0.000); DP (mmHg.bpm) at the 2nd (17,907.5+/- 1,350.7 vs 14,541.9+/- 1,848.0; p=0.03), 3rd (19,687.3+/- 1,444.3 vs 15,612.1+/- 1,180.3; p=0.008) and 4th series (21,271.0+/- 1,794.2 vs 15,992.0+/- 1,093.4; p=0.001).
  
  
  CONCLUSIONS
  The discontinuous protocol promoted higher increase in pressure responses when compared to the continuous one. However, due to the characteristics of the study design, further studies are necessary to support these findings.
authors.affiliation: Universidade Estadual de Londrina, Paraná, PR, Brazil. marcospolito@uel.br
authors.forename: Marcos Doederlein
authors.initials: MD
authors.lastname: Polito
authors.forename: Roberto
authors.initials: R
authors.lastname: Simão
authors.forename: Vitor Agnew
authors.initials: VA
authors.lastname: Lira
authors.forename: Antônio Cláudio Lucas da
authors.initials: AC
authors.lastname: Nóbrega
authors.forename: Paulo de Tarso Veras
authors.initials: Pde T
authors.lastname: Farinatti
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007719:Knee Joint; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D017156:Photoplethysmography; D010865:Pilot Projects