Vincent 2015 Front Physiol
|Vincent G, Lamon S, Gant N, Vincent PJ, MacDonald JR, Markworth JF, Edge JA, Hickey AJ (2015) Changes in mitochondrial function and mitochondria associated protein expression in response to 2-weeks of high intensity interval training. Front Physiol 6:51.|
Abstract: High-intensity short-duration interval training (HIT) stimulates functional and metabolic adaptation in skeletal muscle, but the influence of HIT on mitochondrial function remains poorly studied in humans. Mitochondrial metabolism as well as mitochondrial-associated protein expression were tested in untrained participants performing HIT over a 2-week period.
Eight males performed a single-leg cycling protocol (12 × 1 min intervals at 120% peak power output, 90 s recovery, 4 days/week). Muscle biopsies (vastus lateralis) were taken pre- and post-HIT. Mitochondrial respiration in permeabilized fibers, citrate synthase (CS) activity and protein expression of peroxisome proliferator-activated receptor gamma coactivator (PGC-1α) and respiratory complex components were measured.
HIT training improved peak power and time to fatigue. Increases in absolute oxidative phosphorylation (OXPHOS) capacities and CS activity were observed, but not in the ratio of CIV to the electron transport system (CIV/ETS), the respiratory control ratios (RCR-1 and RCR-2) or mitochondrial-associated protein expression. Specific increases in OXPHOS flux were not apparent after normalization to CS, indicating that gross changes mainly resulted from increased mitochondrial mass.
Over only 2 weeks HIT significantly increased mitochondrial function in skeletal muscle independently of detectable changes in mitochondrial-associated and mitogenic protein expression.
• Keywords: HIT, PGC-1α, mitochondria, oxidative phosphorylation, skeletal muscle
• O2k-Network Lab: NZ Auckland Hickey AJ
Labels: MiParea: Respiration, Exercise physiology;nutrition;life style
Organism: Human Tissue;cell: Skeletal muscle Preparation: Permeabilized tissue Enzyme: Complex IV;cytochrome c oxidase
Coupling state: LEAK, OXPHOS, ET Pathway: N, S, ROX HRR: Oxygraph-2k
MiR05, MitoEAGLE muscle buffer
MitoFit news 2015#8
- 2015-06-16: HIT and fit: 2-weeks of high intensity interval training. »MitoFit news
- An Oroboros Oxygraph-2k was used in this publication, whereas the Anton Paar/Oroboros Oxygraph was the first-generation instrument for high-resolution respirometry, which was replaced by the O2k in 2002.
- Gnaiger 2012 Abstract Bioblast-Gentle Science
- Pesta D, Hoppel F, Macek C, Messner H, Faulhaber M, Kobel C, Parson W, Burtscher M, Schocke M, Gnaiger E (2011) Similar qualitative and quantitative changes of mitochondrial respiration following strength and endurance training in normoxia and hypoxia in sedentary humans. Am J Physiol Regul Integr Comp Physiol 301:R1078–87. »Bioblast link«