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Area of Science:

  • Exercise Physiology
  • Cardiovascular Response to Exercise
  • Resistance Training

Background:

  • Understanding the acute physiological responses to different resistance exercise protocols is crucial for optimizing training.
  • Continuous versus discontinuous resistance exercise may elicit distinct hemodynamic and perceptual responses.
  • Previous research has not fully elucidated the comparative effects of varying pause durations within discontinuous sets.

Purpose of the Study:

  • To compare the acute hemodynamic responses and rate of perceived exertion (RPE) between continuous and discontinuous resistance exercise.
  • To investigate the influence of short intra-set pauses (5s and 10s) on physiological outcomes during resistance exercise.

Main Methods:

  • Participants performed knee extensions at 70% of their 12 repetition maximum.
  • Exercise protocols included continuous (C), discontinuous with 5s pauses (D5), and discontinuous with 10s pauses (D10).
  • Systolic blood pressure (SBP), diastolic blood pressure (DBP), cardiac output (Q), heart rate (HR), stroke volume (SV), total peripheral resistance (TPR), and RPE were measured.

Main Results:

  • Discontinuous protocols (D5, D10) resulted in significantly higher increases in SBP compared to continuous (C).
  • Cardiac output (Q) and stroke volume (SV) were elevated, while heart rate (HR) was lower during discontinuous exercise.
  • Total peripheral resistance (TPR) decreased during pauses in discontinuous protocols, and RPE was attenuated compared to continuous exercise.

Conclusions:

  • Discontinuous resistance exercise exacerbates acute hemodynamic responses, particularly blood pressure and cardiac output, compared to continuous protocols.
  • The inclusion of short intra-set pauses in resistance exercise lowers the overall perceived exertion.
  • These findings suggest that discontinuous protocols may offer a way to increase exercise intensity while potentially improving tolerance.