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Heart rate acceleration at relative workloads during treadmill and overground running for tracking exercise
Clint R Bellenger1,2, Rebecca L Thomson3, Eileen Y Robertson4
1Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, University of South Australia, Adelaide, SA, 5001, Australia. clint.bellenger@unisa.edu.au.
Scientific Reports
|September 5, 2020
Summary
Maximal heart rate increase (rHRI) at relative workloads does not track exercise performance. However, rHRI assessed during the transition from rest to running is highly correlated between treadmill and field tests at 65% peak HR.
Area of Science:
- Exercise Physiology
- Sports Science
- Biomechanical Analysis
Background:
- Maximal rate of heart rate increase (rHRI) is a measure of heart rate acceleration during exercise transitions.
- rHRI assessed at relative workloads may better track exercise performance than at absolute workloads.
- Field tests assessing rHRI would enhance its practical applicability.
Purpose of the Study:
- To evaluate the sensitivity of rHRI assessed at individualized relative workloads during treadmill and overground running for tracking exercise performance.
- To compare rHRI measurements between treadmill and overground running conditions.
- To determine if rHRI correlates with 5km time trial performance.
Main Methods:
- 11 male runners completed a 5km time trial (5TTT) and rHRI assessments after light training (LT), heavy training (HT), and a taper (T).
- rHRI was calculated from HR data during a 5-minute run at 65% peak HR (rHRI65%) and transition to 85% peak HR (rHRI85%).
- Assessments were conducted on a treadmill and during overground running using a foot-mounted accelerometer for pacing.
Main Results:
- 5TTT performance likely worsened after HT and improved after T.
- Treadmill and field rHRI65% likely increased after HT but were unchanged at T.
- Treadmill and field rHRI85% were unchanged after HT and likely decreased after T. 5TTT was not correlated with rHRI.
- rHRI65% showed high correlation between treadmill and field tests; rHRI85% showed trivial to moderate correlations.
Conclusions:
- Maximal rate of heart rate increase assessed at relative exercise intensities does not track running performance.
- rHRI assessed during the transition from rest to running overground and on a treadmill at the same speed are highly correlated.
- rHRI can be validly assessed under field conditions at 65% of peak HR.
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