Key result
Exercise heart rate during a standardized submaximal warm-up decreased by 1.5% following four consecutive days of training compared to a recovered state in elite badminton players.
Why the study?
The study was conducted to investigate short-term training and recovery-related effects on heart rate during a standardized submaximal running test.
Does short-term accumulation of training load affect exercise heart rate during a standardized warm-up in elite badminton players compared to a recovered state?
Observational (n=10)
No
Does short-term accumulation of training load affect exercise heart rate during a standardized warm-up in elite badminton players compared to a recovered state?
Exercise heart rate measured during a standardized warm-up decreases in response to consecutive days of training, suggesting it is a sensitive marker for short-term accumulation of training load.
May inform athlete load monitoring via HRex; leaves open clinical translation and requires prospective validation.
PURPOSE: To investigate short-term training and recovery-related effects on heart rate during a standardized submaximal running test. METHODS: Ten elite badminton players (7 females and 3 males) were monitored during a 12-week training period in preparation for the World Championships. Exercise heart rate (HRex) and perceived exertion were measured in response to a 5-min submaximal shuttle-run test during the morning session warm-up. This test was repeatedly performed on Mondays after 1-2 days of pronounced recovery ('recovered' state; reference condition) and on Fridays following 4 consecutive days of training ('strained' state). In addition, the serum concentration of creatine kinase and urea, perceived recovery-stress states, and jump performance were assessed before warm-up. RESULTS: Creatine kinase increased in the strained compared to the recovered state and the perceived recovery-stress ratings decreased and increased, respectively (range of average effects sizes: |d| = 0.93-2.90). The overall HRex was 173 bpm and the observed within-player variability (i.e., standard deviation as a coefficient of variation [CV]) was 1.3% (90% confidence interval: 1.2% to 1.5%). A linear reduction of -1.4% (-3.0% to 0.3%) was observed in HRex over the 12-week observational period. HRex was -1.5% lower (-2.2% to -0.9%) in the strained compared to the recovered state, and the standard deviation (as a CV) representing interindividual variability in this response was 0.7% (-0.6% to 1.2%). CONCLUSIONS: Our findings suggest that HRex measured during a standardized warm-up can be sensitive to short-term accumulation of training load, with HRex decreasing on average in response to consecutive days of training within repeated preparatory weekly microcycles. From a practical perspective, it seems advisable to determine intra-individual recovery-strain responses by repeated testing, as HRex responses may vary substantially between and within players.
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Schneider et al. (2020) conducted an observational in Training strain and recovery (n=10). Consecutive days of training (strained state) vs. 1-2 days of recovery (recovered state) was evaluated on Exercise heart rate (HRex) during a 5-min submaximal shuttle-run test (-1.5%, 95% CI -2.2 to -0.9, p=0.09). Exercise heart rate during a standardized submaximal warm-up decreased by 1.5% following four consecutive days of training compared to a recovered state in elite badminton players.
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