Maximal rate of increase in heart rate during the rest-exercise transition tracks reductions in exercise performance when training load is increased

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• 作者：Maximillian J. Nelson ; Rebecca L. Thomson ; Daniel K. Rogers ; Peter R.C. Howe ; Jonathan D. Buckley
• 关键词：Cardiac autonomic function ; Heart rate recovery ; Exercise performance ; Training load ; Fatigue
• 刊名：Journal of Science and Medicine in Sport
• 出版年：January, 2014
• 年：2014
• 卷：17
• 期：1
• 页码：129-133
• 全文大小：698 K

文摘

<h4 class="h4">Objectivesh4>Heart rate kinetics are faster in well-trained athletes at exercise onset, indicating sensitivity to training status, but whether they track performance changes due to changes in training load is unknown.<h4 class="h4">Designh4>

Randomised, counterbalanced, cross-over.<h4 class="h4">Methodsh4>

17 cyclists completed two weeks of light and two weeks of heavy training. The day after each training period heart rate was recorded during 5 min cycling at 100 W to determine the maximal rate of heart rate increase. Participants then performed a 5 min cycle time-trial after which heart rate recovery was determined.<h4 class="h4">Resultsh4>

Work during 5 min cycle time-trial decreased 3.5% (P < 0.04) in participants (n = 8) who increased training load (completed light training then heavy training) and, although maximal rate of heart rate increase did not change (P = 0.27), within-individual changes in work were correlated with changes in maximal rate of heart rate increase (r = 0.87, P = 0.005). Work during 5 min cycle time-trial increased 6.5% (P < 0.001) in 9 participants who decreased training load (completed heavy training then light training) and maximal rate of heart rate increase increased 28% (P = 0.002) but the changes in maximal work were not related to changes in rate of heart rate increase (r = 0.32, P = 0.40). Heart rate recovery tended to track changes in 5 min cycle time-trial work following increases and decreases in training load (r = 0.65-0.75, P = 0.03-0.08).<h4 class="h4">Conclusionsh4>

Maximal rate of heart rate increases during cycling at 100 W tracks reductions in exercise performance when training load is increased, but not performance improvements when training loads are reduced. Maximal rate of heart rate increase may be a useful adjunct to heart rate recovery for tracking changes in exercise performance.