Critical power is a key threshold determining the magnitude of post-exercise hypotension in non-hypertensive young males. Lei, T., Wang, I., Chen, Y., Liu, X., Fujii, N., Koga, S., Perry, B., Mundel, T., Wang, F., Cao, Y., Dobashi, K., Kondo, N., Li, H., & Goulding, R. P. Experimental Physiology, 108(11):1409–1421, November, 2023.
doi  abstract   bibtex   
The effect of different exercise intensities on the magnitude of post-exercise hypotension has not been rigorously clarified with respect to the metabolic thresholds that partition discrete exercise intensity domains (i.e., critical power and the gas exchange threshold (GET)). We hypothesized that the magnitude of post-exercise hypotension would be greater following isocaloric exercise performed above versus below critical power. Twelve non-hypertensive men completed a ramp incremental exercise test to determine maximal oxygen uptake and the GET, followed by five exhaustive constant load trials to determine critical power and W' (work available above critical power). Subsequently, criterion trials were performed at four discrete intensities matched for total work performed (i.e., isocaloric) to determine the impact of exercise intensity on post-exercise hypotension: 10% above critical power (10% \textgreater CP), 10% below critical power (10% \textless CP), 10% above GET (10% \textgreater GET) and 10% below GET (10% \textless GET). The post-exercise decrease (i.e., the minimum post-exercise values) in mean arterial (10% \textgreater CP: -12.7 ± 8.3 vs. 10% \textless CP: v3.5 ± 2.9 mmHg), diastolic (10% \textgreater CP: -9.6 ± 9.8 vs. 10% \textless CP: -1.4 ± 5.0 mmHg) and systolic (10% \textgreater CP: -23.8 ± 7.0 vs. 10% \textless CP: -9.9 ± 4.3 mmHg) blood pressures were greater following exercise performed 10% \textgreater CP compared to all other trials (all P \textless 0.01). No effects of exercise intensity on the magnitude of post-exercise hypotension were observed during exercise performed below critical power (all P \textgreater 0.05). Critical power represents a threshold above which the magnitude of post-exercise hypotension is greatly augmented. NEW FINDINGS: What is the central questions of this study? What is the influence of exercise intensity on the magnitude of post-exercise hypotension with respect to metabolic thresholds? What is the main finding and its importance? The magnitude of post-exercise hypotension is greatly increased following exercise performed above critical power. However, below critical power, there was no clear effect of exercise intensity on the magnitude of post-exercise hypotension.
@article{lei_critical_2023,
	title = {Critical power is a key threshold determining the magnitude of post-exercise hypotension in non-hypertensive young males},
	volume = {108},
	issn = {1469-445X},
	doi = {10.1113/EP091429},
	abstract = {The effect of different exercise intensities on the magnitude of post-exercise hypotension has not been rigorously clarified with respect to the metabolic thresholds that partition discrete exercise intensity domains (i.e., critical power and the gas exchange threshold (GET)). We hypothesized that the magnitude of post-exercise hypotension would be greater following isocaloric exercise performed above versus below critical power. Twelve non-hypertensive men completed a ramp incremental exercise test to determine maximal oxygen uptake and the GET, followed by five exhaustive constant load trials to determine critical power and W' (work available above critical power). Subsequently, criterion trials were performed at four discrete intensities matched for total work performed (i.e., isocaloric) to determine the impact of exercise intensity on post-exercise hypotension: 10\% above critical power (10\% {\textgreater} CP), 10\% below critical power (10\% {\textless} CP), 10\% above GET (10\% {\textgreater} GET) and 10\% below GET (10\% {\textless} GET). The post-exercise decrease (i.e., the minimum post-exercise values) in mean arterial (10\% {\textgreater} CP: -12.7 ± 8.3 vs. 10\% {\textless} CP: v3.5 ± 2.9 mmHg), diastolic (10\% {\textgreater} CP: -9.6 ± 9.8 vs. 10\% {\textless} CP: -1.4 ± 5.0 mmHg) and systolic (10\% {\textgreater} CP: -23.8 ± 7.0 vs. 10\% {\textless} CP: -9.9 ± 4.3 mmHg) blood pressures were greater following exercise performed 10\% {\textgreater} CP compared to all other trials (all P {\textless} 0.01). No effects of exercise intensity on the magnitude of post-exercise hypotension were observed during exercise performed below critical power (all P {\textgreater} 0.05). Critical power represents a threshold above which the magnitude of post-exercise hypotension is greatly augmented. NEW FINDINGS: What is the central questions of this study? What is the influence of exercise intensity on the magnitude of post-exercise hypotension with respect to metabolic thresholds? What is the main finding and its importance? The magnitude of post-exercise hypotension is greatly increased following exercise performed above critical power. However, below critical power, there was no clear effect of exercise intensity on the magnitude of post-exercise hypotension.},
	language = {eng},
	number = {11},
	journal = {Experimental Physiology},
	author = {Lei, Tze-Huan and Wang, I.-Lin and Chen, Yi-Ming and Liu, Xin-Hao and Fujii, Naoto and Koga, Shunsaku and Perry, Blake and Mundel, Toby and Wang, Faming and Cao, Yinhang and Dobashi, Kohei and Kondo, Narihiko and Li, Hao-Yu and Goulding, Richie P.},
	month = nov,
	year = {2023},
	pmid = {37712355},
	pmcid = {PMC10988428},
	keywords = {Exercise, Exercise Test, Exercise Tolerance, Humans, Male, Oxygen Consumption, Post-Exercise Hypotension, cardiovascular health, critical power, exercise intensity, post-exercise baroreflex},
	pages = {1409--1421},
}
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