Key result
Hypertrophic and maximal strength loading similarly suppress heart rate variability acutely, recovering within 30 minutes.
Why the study?
To compare the acute effects of hypertrophic and maximum strength loadings on heart rate variability and evaluate potential loading-specific alterations against other recovery markers.
Does hypertrophic loading compared to maximum strength loading differentially affect heart rate variability and recovery markers in young men?
RCT (n=10)
Open-label
Randomized and counter-balanced
No
Does hypertrophic loading compared to maximum strength loading differentially affect heart rate variability and recovery markers in young men?
Effect estimate: HYP: d = 1.0; MAX: d = 1.1
Absolute Event Rate: 23.9% vs 55.3%
p-value: p=HYP: 0.026; MAX: 0.049
Different strength loading protocols both acutely decrease heart rate variability, but these changes do not distinctly associate with mechanical or biochemical markers of recovery.
Both protocols induce similar acute HRV suppression with rapid recovery; confirms loading type does not differentially affect short-term autonomic recovery in trained men.
This study aimed to compare the acute effects of hypertrophic (HYP) and maximum strength (MAX) loadings on heart rate variability (HRV) and to compare possible loading-specific alterations with other markers of recovery. Ten young men with strength training experience performed two leg press loadings (HYP: five times 10 repetitions at 70% of one repetition maximum (1RM) with 2 minutes inter-set rest; MAX: 15 times one repetition at 100% of 1RM with 3 minutes inter-set rest) in a randomized order. The root mean square of successive differences statistically decreased after both protocols (HYP: 65.7 ± 26.6 ms to 23.9 ± 18.7 ms, p = 0.026; MAX: 77.7 ± 37.0 ms to 55.3 ± 22.3 ms, p = 0.049), while the frequency domains of HRV remained statistically unaltered. The low frequency (LF) band statistically increased at 48h post-MAX only (p = 0.033). Maximal isometric voluntary contraction (MVC) statistically decreased after HYP (p = 0.026) and returned to baseline after 24h of recovery. Creatine kinase (CK) statistically increased above baseline at 1h post-loadings (HYP p = 0.028; MAX p = 0.020), returning to baseline at 24h post. Our findings indicate no distinct associations between changes in HRV and MVC or CK.
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Thamm et al. (2019) conducted an RCT in Healthy (Strength training recovery) (n=10). Hypertrophic strength loading (HYP) vs. Maximum strength loading (MAX: 15 sets of 1 repetition at 100% 1RM with 3 minutes rest) was evaluated on Root mean square of successive differences (RMSSD) in heart rate variability immediately post-loading (HYP: d = 1.0; MAX: d = 1.1, p=HYP: 0.026; MAX: 0.049). Both hypertrophic and maximal strength loading protocols acutely decreased heart rate variability (RMSSD) to a similar magnitude, returning to baseline within 30 minutes post-exercise.
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