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Related Concept Videos

The Parasympathetic Nervous System01:14

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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
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Parasympathetic activity delayed after self-paced exercise.

Lucas Rosiello Trojbicz1, Mayara Vieira Damasceno1, Leonardo Alves Pasqua1

  • 1a Endurance Sports Research Group (GEDAE-USP), School of Physical Education and Sport , University of São Paulo , São Paulo , Brazil.

European Journal of Sport Science
|April 19, 2018
PubMed
Summary
This summary is machine-generated.

Constant load exercise promotes faster autonomic recovery compared to self-paced endurance exercise, indicated by improved heart rate variability (HRV) and heart rate recovery.

Keywords:
Passive recoveryautonomic controloxygen uptakepacingparasympathetic activitysympathetic activity

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Area of Science:

  • Exercise Physiology
  • Autonomic Nervous System Function
  • Cardiovascular Regulation

Background:

  • Endurance exercise significantly impacts autonomic control, influencing heart rate and heart rate variability (HRV).
  • The modality of exercise, specifically constant load versus self-paced efforts, may differentially affect post-exercise autonomic recovery.
  • Understanding these differences is crucial for optimizing training and recovery strategies in athletes.

Purpose of the Study:

  • To compare the effects of constant load exercise and self-paced (4-km time trial) exercise on autonomic control following endurance activity.
  • To investigate differences in heart rate recovery and heart rate variability (HRV) between the two exercise protocols.

Main Methods:

  • Ten physically active men underwent a maximal incremental test, a 4-km cycling time trial (TT), and a constant workload test matched for total work.
  • Gas exchange, blood lactate, heart rate, and heart rate variability (HRV) were measured during passive recovery.
  • Power output and blood lactate levels were compared between the constant workload and 4-km TT protocols.

Main Results:

  • The 4-km TT elicited higher power output and blood lactate levels than the constant workload test.
  • Heart rate recovery at 60 and 120 seconds was significantly faster following the constant workload exercise compared to the 4-km TT.
  • Heart rate variability (RMSSD30s) was higher at multiple time points during recovery after the constant workload exercise.

Conclusions:

  • Autonomic control responses post-endurance exercise are dependent on the exercise modality.
  • Self-paced exercise, like a 4-km TT, may lead to a delayed parasympathetic reactivation compared to constant load exercise.
  • Constant load exercise appears to facilitate a more rapid return of autonomic function.