The Differential Hormonal Milieu of Morning versus Evening May Have an Impact on Muscle Hypertrophic Potential

Autor: Jayde Whittingham-Dowd, Jeremy T. Allen, Simon D. Burley, Jean-Francois Grosset, Gladys Onambele-Pearson
Rok vydání: 2016
Předmět:
Male
0301 basic medicine
Hydrocortisone
Anabolism
Physiology
lcsh:Medicine
Protein Synthesis
Biochemistry
Muscle hypertrophy
0302 clinical medicine
Medicine and Health Sciences
Morphogenesis
Public and Occupational Health
Lipid Hormones
lcsh:Science
Musculoskeletal System
Morning
Medicine(all)
Multidisciplinary
Agricultural and Biological Sciences(all)
Muscles
Chemical Synthesis
Hematology
Venous blood
Muscle Differentiation
Sports Science
Body Fluids
Circadian Rhythm
Blood
medicine.anatomical_structure
Strength Training
Anatomy
Research Article
medicine.drug
Adult
medicine.medical_specialty
Evening
Biosynthetic Techniques
Strength training
Enzyme-Linked Immunosorbent Assay
Research and Analysis Methods
Cell Line
Young Adult
03 medical and health sciences
Internal medicine
medicine
Humans
Sports and Exercise Medicine
Muscle
Skeletal
Exercise
Steroid Hormones
Biochemistry
Genetics and Molecular Biology(all)
business.industry
lcsh:R
Biology and Life Sciences
Proteins
Skeletal muscle
Resistance Training
Physical Activity
Hypertrophy
030229 sport sciences
Hormones
Insulin-Like Growth Factor Binding Protein 3
030104 developmental biology
Endocrinology
Skeletal Muscles
Physical Fitness
Patient Compliance
lcsh:Q
business
Developmental Biology
Zdroj: PLoS ONE
PLoS ONE, Vol 11, Iss 9, p e0161500 (2016)
Burley, S D, Whittingham-Dowd, J, Allen, J, Grosset, J F & Onambele-Pearson, G L 2016, ' The differential hormonal milieu of morning versus evening may have an impact on muscle Hypertrophic Potential ', PLoS ONE, vol. 11, no. 9, e0161500 . https://doi.org/10.1371/journal.pone.0161500
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0161500
Popis: Substantial gains in muscle strength and hypertrophy are clearly associated with the routine performance of resistance training. What is less evident is the optimal timing of the resistance training stimulus to elicit these significant functional and structural skeletal muscle changes. Therefore, this investigation determined the impact of a single bout of resistance training performed either in the morning or evening upon acute anabolic signalling (insulinlike growth factor-binding protein-3 (IGFBP-3), myogenic index and differentiation) and cat-abolic processes (cortisol). Twenty-four male participants (age 21.4±1.9yrs, mass 83.7 ±13.7kg) with no sustained resistance training experience were allocated to a resistance exercise group (REP). Sixteen of the 24 participants were randomly selected to perform an additional non-exercising control group (CP) protocol. REP performed two bouts of resistance exercise (80% 1RM) in the morning (AM: 0800 hrs) and evening (PM: 1800 hrs), with the sessions separated by a minimum of 72 hours. Venous blood was collected immediately prior to, and 5 min after, each resistance exercise and control sessions. Serum cortisol and IGFBP-3 levels, myogenic index, myotube width, were determined at each sampling period. All data are reported as mean ± SEM, statistical significance was set at P0.05). Timing of resistance training regimen in the evening appears to augment some markers of hypertrophic potential, with elevated IGFBP-3, suppressed cortisol and a superior cellular environment. Further investigation, to further elucidate the time course of peak anabolic signalling in morning vs evening training conditions, are timely.
Databáze: OpenAIRE
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