Int J Sports Med 2011; 32(11): 835-838
DOI: 10.1055/s-0031-1279778
Training & Testing
Georg Thieme Verlag KG Stuttgart · New York

Glucose Response after a Ten-Week Training in Swimming

Y. Sengoku
1  Comprehensive Human Sciences, University of Tsukuba, , Japan
,
K. Nakamura
1  Comprehensive Human Sciences, University of Tsukuba, , Japan
,
T. Takeda
1  Comprehensive Human Sciences, University of Tsukuba, , Japan
,
Y. Nabekura
1  Comprehensive Human Sciences, University of Tsukuba, , Japan
,
S. Tsubakimoto
1  Comprehensive Human Sciences, University of Tsukuba, , Japan
› Author Affiliations
Further Information

Publication History



accepted after revision 16 May 2011

Publication Date:
11 October 2011 (online)

Abstract

The present study investigated the difference in blood glucose concentration (Glu) response during an incremental swimming test before and after a ten-week training period and verified whether blood glucose threshold (GT) could be determined in competitive swimmers. 7 elite male university swimmers participated in this study. 2 incremental swimming tests were conducted in a swimming flume before and after a ten-week training period. Blood lactate concentration (Bla) and Glu were measured after each swimming step, and the velocities of the lactate threshold (VLT) and glucose threshold (VGT) were analyzed. VLT increased significantly after training (1.21±0.06 m·s−1 pre-training, 1.31±0.10 m·s−1 post-training, p<0.05), while Glu did not increase at the higher swimming intensity steps. GT was not determined at each trial. Our results show that lactate threshold (LT) improved significantly after the ten-week training period, while the Glu response during incremental swimming tests did not change. Therefore, GT could not be determined in elite competitive swimmers before and after training.