TY - JFULL AU - Michael J. Hamlin and Apiwan Manimmanakorn and Gavin R. Sandercock and Jenny J. Ross and Robert H. Creasy and John Hellemans PY - 2011/6/ TI - Heart Rate Variability in Responders and Non- Responders to Live-Moderate, Train-Low Altitude Training T2 - International Journal of Sport and Health Sciences SP - 809 EP - 814 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/9473 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 53, 2011 N2 - The aim of this study was to compare the effects of an altitude training camp on heart rate variability and performance in elite triathletes. Ten athletes completed 20 days of live-high, train-low training at 1650m. Athletes underwent pre and post 800-m swim time trials at sea-level, and two heart rate variability tests at 1650m on the first and last day of the training camp. Based on their time trial results, athletes were divided into responders and non-responders. Relative to the non-responders, the responders sympathetic-toparasympathetic ratio decreased substantially after 20 days of altitude training (-0.68 ± 1.08 and -1.2 ± 0.96, mean ± 90% confidence interval for supine and standing respectively). In addition, sympathetic activity while standing was also substantially lower post-altitude in the responders compared to the non-responders (-1869 ± 4764 ms2). Results indicate that responders demonstrated a change to more vagal predominance compared to non-responders. ER -