skeletal muscle adaptation(s): from the field to the lab ... · tri skeletal muscle adaptation(s):...
TRANSCRIPT
TRI
Skeletal Muscle Adaptation(s):
From the Field to the Lab and Clinic
Bite of Science – Orlando
Robert Standley, PhD, ATC, CSCS
3/3/2016
TRI The Gameplan
Skeletal Muscle and Exercise Research!
• Athletics/Rehabilitation, Aging, Metabolism
To take you from the Field to the Lab and
Clinic
• Highlight my path from the West Coast to
East Coast
2
TRI The Field Meets the Lab 4
Effects of High Dose Fish Oil Supplementation
on Delayed Onset Muscle Soreness (DOMS) and
Inflammatory Markers
Biodex
TRI The Lab 5
Colin Jackson
I I/IIa IIa IIa/IIx IIx I/IIa/IIx
Slow
Oxidative
Fast
Glycolytic
TRI NSAID Consumption
Americans spend over 2.5 billion dollars on
Over-the Counter NSAIDs per year
Top two = Ibuprofen, Acetaminophen
Heart and COX-2 – Celebrex, Vioxx
What happens to Skeletal muscle?
• Blunted normal response in protein synthesis in
young men and women after resistance training
6
TRI COX-Inhibitors and Skeletal Muscle
Phospholipid
PLA2
Arachadonic
Acid
COX
PGH2
PGE2
Synthase
PGF2α
Synthase
PGE2 PGF2α
PGF2α
Receptor PGE2
Receptor
Muscle
Atrophy Muscle
Growth
COX-Inhibitors Acute RE
Drugs ↓ PGF2α
and FSR
TRI Aging Training Study
Resistance Training Program
3 x 10 Knee Ext, 3d/wk 3mo
Drug Consumption
Acetaminophen (4,000mg)
Ibuprofen (1,200mg)
*† *†
*
0
3
6
9
12
15
Perc
ent
*† *†
*
0
6
12
18
24
Kilogra
ms
Quadriceps Muscle Size Quadriceps Muscle Strength
* P<0.05 from Pre-Training
† P<0.05 from Placebo
Placebo Acetphen Ibuprofen Placebo Acetphen Ibuprofen
Trappe et al. 2011
Pre and Post Training Measurements
Screening
Muscle Size – MRI
Muscle Strength
Biopsy
Drugs Stimulate 25-50% Increases in
Muscle Mass and Strength Above Placebo
Placebo Reversed: 7yr Sarcopenia
Drug Groups Reversed: 10yr Sarcopenia
TRI Mechanism Underlying
Muscle Growth?
1. Identified and Measured 21 Components
Associated with Muscle Growth:
• 7 Enzymes, 2 Receptors (PG)
• 3 Growth Regulators
• 4 Atrophy Regulators
• 5 Inflammatory Regulators
Focus on 3 Components
TRI Proposed Mechanism #1
†
†
0
1
2
Placebo Acetaminophen Ibuprofen
Fold
Change
PrePost
PGF2α Receptor
Phospholipid
PLA2
Arachadonic
Acid
COX
PGH2
PGE2
Synthase
PGF2α
Synthase
PGE2 PGF2α
PGF2α
Rec
PGE2
Receptor
Muscle
Atrophy Muscle
Growth
COX-Inhibitors
PGF2α
Rec
PGF2α
Rec
TRI Mechanism Underlying
Muscle Growth?
0
1
2
3
Placebo Acetphen Ibuprofen
Fold
Change
PrePost
*
0
0.5
1
1.5
2
Placebo Acetphen Ibuprofen
Fold
Change
Pre
Post*
IL-6 Stimulates Net
Skeletal Muscle Loss
MuRF-1 is a E3 Ubiquitin
Ligase that Contributes to
Skeletal Muscle Proteolysis
IL-6 MuRF-1
Trappe et al. 2013 AJPReg
TRI Proposed Mechanism of Action
EP4
PGE2
NF-κB
IL-6 MuRF-1
Drugs
Drugs Drugs Net Muscle Loss Proteolysis
Not Known if this Occurs in
Human Skeletal Muscle
TRI Ex Vivo Study
IL-6 MuRF-1
* P<0.05 Confirm PGE Stimulates IL-6 and MuRF-1
Transcription in Human Skeletal Muscle
Thus Blocking PGE Production with
COX-Inhibitors during RE Reduces the Negative
Effects of IL-6 and MuRF-1 on Muscle Growth
*
0
1
2
3
4
CON
Fold
Change f
rom
Contr
ol
PGE2
0
0.5
1
1.5
2
CON PGE
Fold
Change f
rom
Contr
ol
*
PGE2
TRI
MuRF-1
Proposed Mechanism #2
*
0
1
2
3
Placebo Acetaminophen Ibuprofen
Fold
Change
PrePost
IL-6
†
0
1
2
Placebo Acetaminophen Ibuprofen
Fold
Change
Phospholipid
PLA2
Arachadonic
Acid
COX
PGH2
PGE2
Synthase
PGF2α
Synthase
PGE2 PGF2α
PGF2α
Receptor
PGE2
Receptor
Muscle
Atrophy Muscle
Growth
COX-Inhibitors
Muscle
Atrophy
NFκB
IL-6 MuRF-1
TRI NSAID Study Summary
PGF2α receptor: an
activator of skeletal
muscle protein synthesis
IL-6 and MuRF-1:
mediators of skeletal
muscle loss
COX-inhibitor drug
consumption produced an
environment that:
• Promoted protein synthesis
• Reduced protein breakdown
*† *†
*
0
3
6
9
12
15
Perc
ent
*† *†
*
0
6
12
18
24
Kilogra
ms
Quadriceps Muscle Size
Quadriceps Muscle Strength
Placebo Acetaminophen Ibuprofen
Placebo Acetaminophen Ibuprofen
TRI Peripheral Insulin Resistance 19
Peripheral
Insulin
Resistance
Inactivity
Caloric Excess
Obesity/T2D
Impaired Glucose Uptake
Altered FA Metabolism
Oxidative Stress
?
TRI MIRAGE-Skeletal Muscle Lipid and
Insulin Resistance and Aging 20
Education Control (CON)
Diet-Induced Weight Loss (DIWL)
Diet-Induced Weight Loss+Exercise
(WLEX)
6 Month Intervention
Hyp-Eug Clamp MB X 2
Hyp-Eug Clamp MB X 2
VO2max DEXA
Muscle CSA-MRI
VO2max DEXA
Muscle CSA-MRI
0
1
2
3
4
5
CON DIWL WLEX
Ab
s C
han
ge
GIR
(m
g/F
FM
kg
/min
)
TRI Take Home Message
Questions
Finding the answers
• Pubmed/Google Scholar
• Create your own solution
• Acquire the skills so you can answer
Building a Building
Creating Opportunities – Who moved my cheese
21
and a Hypothesis