Highlights
- •Platelet mitochondrial function is an ideal bioenergetic indicator in HF patients.
- •HIIT elevates bioenergetics health index of platelet mitochondria in HF patients.
- •HIIT enhances platelet mitochondrial OCRs via increasing Complex I/II activities.
- •Aerobic fitness is positively associated with platelet mitochondrial OCRs in HF patients.
Abstract
Objective
Exercise improves cardiopulmonary fitness and reduces the risk of vascular thrombosis
in patients with cardiovascular diseases. In platelets, mitochondria carry out cellular
bioenergetics and thrombogenesis. This study aimed to elucidate the effect of high-intensity
interval training (HIIT) on systemic aerobic capacity and platelet mitochondrial bioenergetics
in patients with heart failure (HF).
Methods
Thirty-four randomly selected HF patients engaged in HIIT (3-min intervals at 40%
and 80% of VO2peak, n = 17) for 30 min/day, 3 days/week for 12 weeks, or to a control group that received
general healthcare (GHC; n = 17). Systemic aerobic capacity (i.e., peak O2 consumption, VO2peak) and platelet mitochondrial O2 consumption rate (OCR) in the HF patients were measured through automatic gas analysis
and high-resolution respirometry, respectively.
Results
The HIIT group exhibited higher VO2peak and O2 uptake efficiency slope and lower VE-VCO2 slope after 12-week intervention, compared to those of the GHC group. Moreover, the
HIIT regimen increased the maximal and reserve OCR capacities, enhanced the Complex
I- and II-mediated OCRs, and elevated the bioenergetic health index in platelet mitochondria;
however, these effects were not observed with the GHC regimen. Additionally, the VO2peak levels were positively correlated with the maximal and reserve OCR capacities and
Complex I- and II-mediated OCRs in platelet mitochondria.
Conclusion
Platelet mitochondrial function is an ideal bioenergetic indicator in patients with
HF. HIIT for 12 weeks elevates platelet mitochondrial OCRs via increasing Complex
I and II activities. Moreover, systemic aerobic capacity is positively associated
with platelet mitochondrial OCRs in HF patients.
Keywords
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Article Info
Publication History
Published online: July 27, 2018
Accepted:
July 20,
2018
Received in revised form:
June 25,
2018
Received:
January 28,
2018
Identification
Copyright
© 2018 Elsevier B.V. All rights reserved.

