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Cardiac autonomic responses to repeated shuttle sprints
F Y Nakamura1, L F Soares-Caldeira, P B Laursen
1Universidade Estadual de Londrina, Departamento de Educação Física, Londrina, Brazil. fabioy_nakamura@yahoo.com.br
International Journal of Sports Medicine
|August 18, 2009
Summary
Repeated shuttle sprints in team sports cause similar lactic acidosis and autonomic stress as the 30-15 Intermittent Fitness Test (IFT). This finding helps understand athlete fatigue during intense match play.
Area of Science:
- Sports Science
- Exercise Physiology
- Physiological Responses to Exercise
Background:
- Team sports demand repeated shuttle sprints, leading to fatigue.
- The impact of these sprints on lactic acidosis and autonomic state is not fully understood.
- Understanding these effects is crucial for optimizing training and performance.
Purpose of the Study:
- To compare the blood lactate and cardiac autonomic responses between a repeated shuttle-sprint ability test and the 30-15 Intermittent Fitness Test (IFT).
- To assess the physiological demands of repeated shuttle sprints in team sport athletes.
- To determine if the repeated shuttle-sprint ability test mimics the physiological stress of the 30-15 IFT.
Main Methods:
- Thirteen adult team sport players completed both tests on separate days.
- Blood lactate levels were measured pre- and post-exercise.
- Cardiac autonomic responses were evaluated using heart rate recovery and heart rate variability (HRV).
Main Results:
- Peak blood lactate levels were similar between the repeated shuttle-sprint ability test and the 30-15 IFT.
- Heart rate recovery post-exercise was comparable for both tests.
- Most HRV indices showed similar decreases from baseline, with some vagal-related indices recovering faster after the shuttle-sprint test.
Conclusions:
- The repeated shuttle-sprint ability test induces comparable lactic acidosis and post-exercise autonomic stress to the 30-15 IFT.
- These physiological responses are representative of those experienced during team sport match play.
- This provides a valid model for studying fatigue in team sports.
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