Key result
Maximal high knee lifts in elite sprinters decreased the LF/HF ratio and neutrophil count, while increasing HF Norm and lymphocyte count.
Why the study?
Does short, maximal exercise alter autonomic parameters and differential white blood cell counts in elite sprinters?
Observational (n=5)
No
Does short, maximal exercise alter autonomic parameters and differential white blood cell counts in elite sprinters?
Maximal exercise in elite sprinters induces significant acute alterations in heart rate variability and differential leukocyte counts, suggesting these parameters may be useful for quantifying autonomic resilience and conditioning levels.
Answers are grounded in this paper and cite their sources.
Acute changes may mark autonomic resilience in sprinters; hypothesis-generating for conditioning assessment, needs larger validation.
Top Japanese sprinters were evaluated for their physical condition, autonomic function, blood chemistry, differential leukocyte count and blood lactate level before and after short, maximal exercise to explore methods of quantifying their conditioning level. Statistical analysis of data obtained before and 10 min after exercise were used to estimate the athletes’ autonomic capacity during recovery. Pre and post exercise variances in differential leukocyte count revealed strong correlations between neutrophil and sympathetic activity, and lymphocyte and parasympathetic activity. The results of the study demonstrated significant alterations in autonomic parameters and differential white blood cell count in response to maximal exercise.
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Suetake et al. (2010) conducted an observational in Healthy elite sprinters (n=5). Maximal high knee lifts vs. Pre-exercise baseline was evaluated on Frequency domain parameters of HRV (TP, LF Norm, HF Norm, LF/HF ratio) and differential leukocyte count (p=<0.05). Maximal high knee lifts in elite sprinters decreased the LF/HF ratio and neutrophil count, while increasing HF Norm and lymphocyte count.
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