Aaron C Petersen
Victoria University, Australia
Na+/K+-ATPaseEndocrinologyPhysical therapyMuscle fatigueSkeletal muscle
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Publications 27
#1Victoria L. Wyckelsma (VU: Victoria University, Australia)H-Index: 8
#2Itamar Levinger (VU: Victoria University, Australia)H-Index: 20
Last. Robyn M. Murphy (La Trobe University)H-Index: 32
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Key points Ageing is associated with an upregulation of mitochondrial dynamics proteins mitofusin 2 (Mfn2) and mitochondrial dynamics protein 49 (MiD49) in human skeletal muscle with the increased abundance of Mfn2 being exclusive to type II muscle fibres. These changes occur despite a similar content of mitochondria, as measured by COXIV, NDUFA9 and complexes in their native states (Blue Native PAGE). Following 12 weeks of high-intensity training (HIT), older adults exhibit a robust increase in...
11 CitationsSource
#1Mathew William Hunter Inness (VU: Victoria University, Australia)H-Index: 2
#2François Billaut (Laval University)H-Index: 12
Last. Robert J. Aughey (VU: Victoria University, Australia)H-Index: 29
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Purpose: To determine if heavy resistance training in hypoxia (IHRT) is more effective at improving strength, power and increasing lean mass than the same training in normoxia. Methods: A pair-matched, placebo-controlled study design included 20 resistance-trained participants assigned to IHRT (FIO2 0.143) or placebo (FIO2 0.20), (n=10 per group). Participants were matched for strength and training. Both groups performed 20 sessions over 7 weeks either with IHRT or placebo. All participants were...
14 CitationsSource
#1Ben D. Perry (VU: Victoria University, Australia)H-Index: 7
#2Victoria L. Wyckelsma (VU: Victoria University, Australia)H-Index: 8
Last. Michael J. McKenna (VU: Victoria University, Australia)H-Index: 63
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This is the first study to investigate the effects of controlled unloading on muscle sodium-potassium pumps (NKA) in human muscle, being measured in both whole homogenate and single fibers. Despite considerable functional deficits caused by disuse, which were recovered by resistance training, muscle NKA content and isoform abundances were resilient to change, despite some fiber type-specific changes in NKA isoforms. Hence muscle NKA regulation in response to disuse is more complex than previousl...
8 CitationsSource
#1Cameron J. Mitchell (University of Auckland)H-Index: 20
#2Paul A. Della Gatta (Deakin University)H-Index: 14
Last. James F. Markworth (Deakin University)H-Index: 16
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Background The phosphorylation of p70S6 Kinase (p70S6K) is an important step in the initiation of protein translation. p70S6K phosphorylation is enhanced with graded intakes of whey protein after resistance exercise. Soy protein ingestion results in lower muscle protein synthesis after exercise compared with whey; however, the underlying mechanisms responsible for this difference have not been reported.
14 CitationsSource
ABSTRACTBROATCH, J. R., A. PETERSEN, and D. J. BISHOP. Postexercise Cold Water Immersion Benefits Are Not Greater than the PlaceboEffect. Med. Sci. Sports Exerc., Vol. 46, No. 11, pp. 2139–2147, 2014. Purpose: Despite a general lack of understanding of theunderlying mechanisms, cold water immersion (CWI) is widely used by athletes for recovery. This study examined the physiologicalmerit of CWI for recovery from high-intensity exercise by investigating if the placebo effect is responsible for any...
51 CitationsSource
#1Randall F. D'Souza (University of Auckland)H-Index: 8
#2James F. Markworth (University of Auckland)H-Index: 16
Last. David Cameron-Smith (University of Auckland)H-Index: 48
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Resistance exercise and whey protein supplementation are effective strategies to activate muscle cell anabolic signaling and ultimately promote increases in muscle mass and strength. In the current study, 46 healthy older men aged 60–75 (69.0 0.55 years, 85.9 1.8 kg, 176.8 1.0 cm) performed a single bout of unaccustomed lower body resistance exercise immediately followed by ingestion of a noncaloric placebo beverage or supplement containing 10, 20, 30, or 40 g of whey protein concentrate (WPC). ...
27 CitationsSource
#1Tania Atanasovska (VU: Victoria University, Australia)H-Index: 2
#2Aaron C Petersen (VU: Victoria University, Australia)H-Index: 14
Last. Michael J. McKenna (VU: Victoria University, Australia)H-Index: 63
view all 6 authors...
We investigated whether potassium (K+) disturbances during and following intense exercise may be pronounced when utilizing a large contracting muscle mass, examining maximal 2,000-m rowing exercise effects on radial arterial plasma K+ concentration ([K+]a) in 11 healthy adults. Blood was sampled at baseline, preexercise, each 30 s during rowing, and for 30 min postexercise. Time to complete 2,000 m was 7.26 ± 0.59 min; power output at 30 s was 326 ± 81 W (mean ± SD). With exercise time expressed...
12 CitationsSource
#1Jenni Raines (Deakin University)H-Index: 4
#2Rodney J. Snow (Deakin University)H-Index: 38
Last. Brad Aisbett (Deakin University)H-Index: 16
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Abstract The purpose of this study was to examine 1) wildfire fighters' ability to consume the prescribed fluid volume (1200 mL h−1), 2) the effect of fluid intake on plasma sodium and hydration, and 3) the effect of fluid intake on firefighters' heart rate, core temperature and activity during emergency suppression shifts. Methods Thirty-four firefighters were divided into ad libitum (AD, n = 17) and prescribed (PR, n = 17) drinking groups. Results PR drinkers did not meet the prescribed fluid ...
14 CitationsSource
#1Kevin Netto (Deakin University)H-Index: 15
#2Cara Lord (Deakin University)H-Index: 6
Last. Brad Aisbett (Deakin University)H-Index: 16
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Abstract The aim of this study was to examine the muscle activation of six global muscles during the successful completion of the Pack Hike test (PHT) and compare this to muscle activations during a critical wildfire fighting task. In-field surface electromyography was recorded from eight male wildfire fighters during the PHT and the rakehoe task – a critical wildfire suppression activity. All participants successfully completed the PHT within the 45-min time limit. No significant changes in pea...
1 CitationsSource
#1Jenni Raines (Deakin University)H-Index: 4
#2Rodney J. Snow (Deakin University)H-Index: 38
Last. Brad Aisbett (Deakin University)H-Index: 16
view all 6 authors...
Abstract Wildfire fighters are known to report to work in a hypohydrated state, which may compromise their work performance and health. Purpose To evaluate whether ingesting a bolus of fluid before the shift had any effect on firefighters’ fluid consumption, core temperature, or the time they spent in high heart rate and work activity zones when fighting emergency wildfires. Methods Thirty-two firefighters were divided into non-bolus (AD) and pre-shift drinking bolus (PS, 500 ml water) groups. R...
19 CitationsSource