Parasympathetic withdrawal during 30-15 intermittent fitness test correlates with its maximal running speed in male handball players
Parasympathetic withdrawal parameters estimated during continuous graded exercise have been used as aerobic indices. The purposes of this study were to: 1) examine the pattern of parasympathetic withdrawal during an intermittent fitness test (30-15IFT) and, 2) verify the relationship among parasympathetic withdrawal parameters estimated during 30-15IFT, with its' maximal running speed (VIFT). Thirteen male handball players performed the 30-15IFT. Heart rate variability (HRV) indices were estimated every 45 s over the 30-15IFT until 85% of maximal heart rate or 15 km.h-1, and plotted against time to estimation of parasympathetic withdrawal parameters (t, amplitude (A) and area under the curve (AUC)). Parasympathetic withdrawal was well adjusted to a mono-exponential decay curve-fitting (R2 = 0.96-0.97). The parasympathetic withdrawal parameters t and A were poorly correlated with VIFT (r = 0.29-0.46, P > 0.05), whereas AUC was moderate-to strongly correlated with VIFT (r = 0.64-0.80, P < 0.05). Therefore, AUC derived from the mono-exponential decay pattern during 30-15IFT can be considered an aerobic index of intermittent exercise. ABSTRACT FROM AUTHOR
© Copyright 2009 Journal of Exercise Physiology online. American Society of Exercise Physiologists. All rights reserved.
|Subjects:||handball physical conditioning ability test speed velocity maximum|
|Notations:||biological and medical sciences training science sport games|
|Published in:||Journal of Exercise Physiology online|