the science behind skin sensorial comfort 180125 hohenstein … · 2020. 7. 9. · the science...
TRANSCRIPT
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Distractions Hurt Performance The Science Behind Skin Sensorial Comfort
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Hohenstein Testing & Product Development Services
Comfort• Quantitative thermal comfort
assessment• Breathability• Moisture management• Heating & cooling analysis• Skin sensorial properties• Range of motion
Fit• 3D scanning• Sizing • Fit analysis• Pattern making• Compression
Function• Protection against wind & rain• Abrasion resistance & strength• Cut resistance, reduced noise,
enhanced visibility• UV protection
Quality• Comparative testing • Supply chain
communications • Quality labels• Marketing claim support
Freshness• Odor management• Microbe protection• Ease of care
Sustainability• Harmful substance testing • GMO-cotton testing• Biodegradability• OEKO-TEX®
© Hohenstein
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Functional Clothing & Wear Comfort
Comfort is the result of dedicated, in-depth product development
Wear comfort does not come automatically
All textile construction parameters must be adjusted to climatic conditions & the range of application
Comfort is never the result of just one construction parameter (e.g. fiber materials)
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Sports & Outdoor ClothingFunctions
Multifunctionality
Sustainability
Performance enhancement
Microtechnology integration
Fit
Wear comfort
Bio-based raw materials
© Hohenstein
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Components of Comfort
Thermo-physiological Comfort
Moisture Management
Skin Sensorial Comfort
MechanicalTouch Sensations
Textile/Skin
Ergonomic Comfort
Heat Transport
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• Fiber material/polymer (raw material)
• Yarn construction
• Fabric construction
• Finishing
• Garment making (ergonomics/fit)
• Composition & interaction of the clothing layers
Factors Influencing Comfort
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Skin Sensory Functions
How is the feel of the textile perceived by the wearer‘s skin (cognitive perception)?
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Haptics ≠ Skin Sensory Properties
Perceiving with your hands is not like perceiving with your body
Skin sensory properties -how the textile is perceived by the wearer’s skin
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Fabric & Skin Contact
Our skin = organ of perception & contact
• Protection against heat loss & external factors
• Reception of sensory stimuli by receptors
Pressure receptors
Thermal receptors
Tactile receptors
Pain receptors
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Negative Skin Sensory Perceptions
1/3 of comfort is based on skin sensory properties
• Sweat remains on skin• Fabric clings to skin• Too smooth• Too stiff• Too scratchy
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Neuro-physiological Perception
Measurements in the brain
How strongly does the textile affect the wearer's awareness?
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Skin Sensory Properties Matter
US Army StudyInfluence of clothing (i.e. stiff collars, scratchy textiles) on the mental performance of test subjects
Applications•Military/defense• Competitive sports•Workwear
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Standardized fabric measurements:objective & cost-saving
Skin Sensorial Assessment
1. StiffnessHow well does the textile adapt to the skin? 4. Number of
Contact PointsAt how many points does the textile touch the skin?
5. Wet Cling IndexHow strong does the textileadhere to skin moistened byperspiration?
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2. Sorption IndexHow fast does the textileabsorb a drop of water?
3. Surface IndexHow hairy or smooth is the textile surface?
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Sorption Index
Sweat moistened skin• Feels unpleasant • Is more sensitive to irritations & injury
Measure how fast sweat is absorbed by the textile & transported away from the skin
Applications• All skin contact textiles• Apparel, underwear, outerwear, stockings, socks• Bedding•Workwear & PPR
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Product Improvement Example Surface Index
Brush the surface cozy feel
Before After
Too smooth textile feels
uncomfortable on the skin
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Skin-Textile Contact Points
The number of contact points between textile & skin shows if a textile feels clammy/sticky on the skin• Optimize product development• Absolute & comparative judgements•Measure effect after laundering
ApplicationsAll skin contact textiles
Optical topography of textile surface
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Human Thermoregulation 68F 20C
• Sweat evaporation• Extremity & body
core temperatures are close
• Vascular dilatation
98F
37C
98F
37C
• Vascular constriction• Falling temperature
on hands & feet• Muscle contraction• Shivering
93F 34C
88F 31C
82F 28C
90F 32C
97F 36C 97F 36C
Comfortable – All Ok
Severe Health Damage/Death
Severe Health Damage/Death
95F 35C
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Head production
37°C
© Hohenstein
Clothing Physiology: Body – Climate – Clothing Interaction
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Skin Sensory + Thermo Physiology = Optimal Comfort
Clammy skin is more sensitive
Important parameters to measure with the Hohenstein Skin Model• Breathability• Thermal insulation
© Hohenstein
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Thermo-physiological Measurement Sweating Guarded Hotplate
Hohenstein Skin ModelISO 11092• Water vapor resistance Ret
(breathability)• Thermal resistance Rct
(thermal insulation)
Plus Hohenstein modification• Buffering of water vapor Fd• Sweat absorption Kf• Sweat transport F
© Hohenstein
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Beyond Breathability (Ret)Hohenstein Skin Model
Orange line = minimum requirement
© Hohenstein
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Thermal / Sweating Manikins
Ready-made garments / clothing systems• Thermal insulation • “Breathability”• Ventilation• Range of utility
Thermo-physiological Measuring Methods
© Hohenstein
Charlie(thermal)
Sherlock(sweating)
© Hohenstein
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Wear Trials with Human Subjects
• Simulation of various ambient conditions in a climate chamber
• Objective measurement of skin temperature & humidity via sensors
• Subjective assessment of the comfort by test subjects
© Hohenstein
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Thank you
Ben MeadManaging DirectorHohenstein Institute America
Hohenstein.US
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Staying Warm in Portland Using Thermal Regulating Performance Gear
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Hohenstein Customer Support1000+ Worldwide Employees
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Hohenstein Focus:
Textile-Human-Environment Interface
Comfort• Quantitative thermal comfort
assessment• Breathability• Moisture management• Heating & cooling analysis• Skin sensorial properties• Range of motion
Fit• 3D scanning• Sizing • Fit analysis• Pattern making• Compression
Function• Protection against wind & rain• Abrasion resistance & strength• Cut resistance, reduced noise,
enhanced visibility• UV protection
Quality• Comparative testing • Supply chain
communications • Quality labels• Marketing claim support
Freshness• Odor management• Microbe protection• Ease of care
Sustainability• Harmful substance testing • GMO-cotton testing• Biodegradability• OEKO-TEX®
© Hohenstein
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Sports & Outdoor ClothingFunctions
Multifunctionality
Sustainability
Performance enhancement
Microtechnology integration
Fit
Wear comfort
Bio-based raw materials
© Hohenstein
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Clothing Physiology = Interaction
© Hohenstein
Bodies ClothingClimate
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Clothing Physiology -The Science Behind Comfort
Complete Garments & Clothing Systems
Hohenstein’s core competence since 1950’s
- 60+ years of experience- 150+ public/private
research projects in thermal comfort of textiles
Charlie(thermal)
Sherlock(sweating)
© Hohenstein
Heat & Moisture ManagementHeat Insulation
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Human Thermoregulation 68F 20C
• Sweat evaporation• Extremity & body
core temperatures are close
• Vascular dilatation
98F
37C
98F
37C
• Vascular constriction• Falling temperature
on hands & feet• Muscle contraction• Shivering
93F 34C
88F 31C
82F 28C
90F 32C
97F 36C 97F 36C
Comfortable – All Ok
Severe Health Damage/Death
Severe Health Damage/Death
95F 35C
© Hohenstein
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Head production
37°C
© Hohenstein
Clothing Physiology: Body – Climate – Clothing Interaction
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Metabolic Activity Rates
Activity Metabolic Rate (Watts)
Sleeping 80
Sitting still 115
Standing 160
Light physical action 200
Medium physical action(walking 2.5 mph)
280
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Metabolic Activity Rates
Activity Metabolic Rate (Watts)
Heavy physical action (walking 3 mph)
350
Heaviest labor 450
Cross-country Skiing (competition)
700
High performance sports 800
Temporary peak performance 1000-1200
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Sweat Production during Activity
Activity Sweat (Liters)
100 m sprint 0.1
90 Min Tennis 2.0
90 Min Soccer 3.0
Marathon 4.6
Triathlon/Ironman 20.0
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Scientific Measurement Methods
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Thermo-physiological Measurement Sweating Guarded Hotplate
Hohenstein Skin ModelISO 11092• Water vapor resistance Ret
(breathability)• Thermal resistance Rct
(thermal insulation)
Plus Hohenstein modification• Buffering of water vapor Fd• Sweat absorption Kf• Sweat transport F
© Hohenstein
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Measured values (ISO 11 092/DIN EN 31 092) for the fabric•Water vapor resistance Ret (breathability)• Thermal insulation Rct
Not suitable for measuring heating or cooling effects under various environmental conditions
Thermo-physiological Testing –Fabrics – Hohenstein Skin Model
Skin model inclimatic camber
Sample preparation
“Sweating” skin model
© Hohenstein
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• Thermal - simulation of human heat emission
• Sweating thermal -simulation of human heat & moisture release
• Standing• Moving - simulation of
movements in the real life, ventilation influence
Measurement Methods -Thermal Manikins
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Thermal Insulation & Breathability
• Ts = 34 ° C• 13 heated sections• 32 water outlet openings
0.8 - 211 g water / h• Loading weight 25 - 60
kg, max. 45 steps / min
Sweating Foot
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Moisture & heat transport in apparel, workwear, PPE, car seats, office chairs, mattresses, duvets, etc.
• Standing, walking, sitting, lying• Anatomical shape & size (standard man)•Weight: 30 kg (66.14 lbs)• 32 -34 segments• Simulation of sweating with sweat glands distributed
over body• Distributed heat & humidity sensors
SherlockSweating Thermal Manikin
© Hohenstein
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Sherlock
© Hohenstein
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Ready-made garments / clothing systems• Thermal insulation • “Breathability”• Ventilation• Range of utility
Thermal / Sweating Manikins
© Hohenstein
Charlie(thermal)
Sherlock(sweating)
© Hohenstein
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Wear Tests Weather Conditions in Climate Chamber
Wind HeatRain
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Wear TestsRealistic Scenarios & Environmental Conditions
© Hohenstein
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Thermo-physiological Validation Monitored Wear Trials
• Simulation of various weather conditions & activities in a climatic chamber• Skin temperature & humidity
measurements via sensors• Subjective comfort judgement by the
subjects• Suitable for subjective evaluation of heating
and cooling effects but even greater deal of time & effort• Human testers & numerous ready-made
garments needed
© Hohenstein
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Prediction Model
Determination of Clothing Scope & Comfort
Clothing• Thermal insulation• Water-vapor
transmission resistance
Activity• Metabolic
rate
Max.temp
Application scope
Min.temp
Climatic ConditionsSweat on the skin
Mean skin temp
Wearer• Weight• Surface Area
Physiological burden• Avg. skin temp• Sweat on the
skin• Rectal temp• Heart rate
© Hohenstein
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WATson
Controlled Ambient Climate
SUN/IR-Radiation
Heated Plate
Textile Sample
Water/Sweat Supply
Wind
WATson = Wärme Abgabe Tester (Heat Release Tester)
© Hohenstein
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WATson Quantifying Heat Loss or Gain
• Versatile thermal testing device for special conditions
•Measuring head: fast response time to simulate the thermoregulation of human skin
• Various ambient climates (hot/humid - cold/dry)
• Numerous conditions (sweat, wind, “sun”)
• Results: cooling (heating) power/area in Watts, temperatures under & above the sample
© Hohenstein
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Heating Effect
Heat Gain by Solar Radiation
© Hohenstein
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Average Heating Power by Solar Heat Gain
No heating
Increasing heatingpower
4,81
4,02
5,15
4,30
0
1
2
3
4
5
6
M1 M2 M4 M5
PH
eiz
[W
]
© Hohenstein
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Temperature between Measuring Head & Sample over Time
© Hohenstein
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Clothing Physiology
• Assessment of comfort of textiles, clothing, home textiles• Climatic comfort of car seats• Determination of physiological stress as a function of
clothing, climate & activity• Development of design guidelines for optimized textiles
© Hohenstein
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Clothing Physiology Methods
Acc
urac
y
5. Market test
4. Controlled & limited field trials
3. Controlled treatment tests in climate chamberPhysiological data/ subjective evaluations
2. Biophysical analysis of clothing systems Manikin
1. Biophysical analysis of textilesSkin model/skin sensory/technological investigations
Prediction checks for textiles
Prediction checks for clothing/systems
© Hohenstein
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Thank you
Ben MeadManaging DirectorHohenstein Institute America
Hohenstein.US
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Compression and Fit for Sportswear
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Hohenstein Testing & Product Development Services
Comfort• Quantitative thermal comfort
assessment• Breathability• Moisture management• Heating & cooling analysis• Skin sensorial properties• Range of motion
Fit• 3D scanning• Sizing • Fit analysis• Pattern making• Compression
Function• Protection against wind & rain• Abrasion resistance & strength• Cut resistance, reduced noise,
enhanced visibility• UV protection
Quality• Comparative testing • Supply chain
communications • Quality labels• Marketing claim support
Freshness• Odor management• Microbe protection• Ease of care
Sustainability• Harmful substance testing • GMO-cotton testing• Biodegradability• OEKO-TEX®
© Hohenstein
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HOSYcan measures
• Accurate compression & compression behavior during movement for-Defined standards (e.g. RAL)-Individual requirements
& specifications
• Interaction between materials
• Combined with data from 3D scanning, simulated movement profiles provide increased accuracy for specific applications
Hohenstein Compression Testing Device
© Hohenstein
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Compression Analysis Process
3D ScanningBody Measurement HOSYcan
Compression Data
© Hohenstein
Test Person
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Correlation Between Compression & Shape
Compression force & gradient can be quantified by HOSY
Resulting body shaping effect can be quantified & visualized via 3D-analysis
© Hohenstein
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Compression ProductsProduct Development
Medical ProductsCompression stockings for varicose veins or high risk of thrombosis (blood clotting)
Performance or shaping effect in sportswear, shapewear, wellness textiles
Non-Medical Garments
© Hohenstein
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Compression ProductsCompliance & Consumer Communication
Medical Non-Medical
Tested for compliance with• RAL-GZ 387/1
(hosiery, bandages)• RAL-GZ 387/2 (compression sleeves)• DIN 58133 (hosiery)
Medical product recognition
Quality label Consumer communication of independently verified compression properties
© Hohenstein
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HOSY Test Prep
Waist
Hip
Thigh
Knee
Ankle
4. Move lower clamps to variable positions
3. Insert sample inrequired length
2. Mark measuringpoints on textile
1. Define heights &circumferences
© Hohenstein
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HOSY Test
5. Stretch compressiongarment to specific girth
© Hohenstein
20 points moving atindividual velocities topreset dimensions
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HOSY Test Results
8. Test report7. Data length & circumferences, pressure,residual pressure & practical elongation
6. Graph – compressioncharacteristics along body part
© Hohenstein
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Change of knit • On front at the chest area• On back from neck to waist
Change of knit has a significant influence on the compression. The combination at front & back leads to relative moderate increase of compression in the chest area, comparable to waist area.
Product Improvement
© Hohenstein
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Realistic compression valuesthrough lifelike motion simulations
Precise body measurements
Measurement differences in various body postures
Detailed results for faster, more efficient product design
Sensitive measurement system for optimized products & precise claim verificationMaterial parameters &
comparison for product development & quality control
Compression Testing Benefits
© Hohenstein
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Product Effectiveness -3D Scan Combined with Fitting
1. Scan in underwear2. Scan in compression
wear/shapewear 3. Merge the scans
© Hohenstein
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3D Analysis of Shaping Effects
3D Scan without Compression/Shapewear
Scan Comparison (3D Analysis)
3D Scan withCompression/Shapewear
© Hohenstein
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Scan: Body Measurement Changes
-0,4 cm
-1,3 cm
+1,1 cm
-0,6 cm
Regular Underwear
Shape/compression
wear
© Hohenstein
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3D-Analysis: Changes in Geometry
spanned – neutral – compressed
© Hohenstein
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Shapewear Scan -Cross Section Silhouettes
Regular Underwear
Shapewear
Shape/compression
wear
© Hohenstein
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4D Scanning
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Scanning in motion
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Scanning in motion
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How do body measurements change in motion?
Title of presentation I Date I LOCATION
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• 3D/4D capture of body movement measurements
• Restriction of mobility by ill-fitting clothing
Opportunities for 4D Scanning
27.4”
9.8”
22.5”
7.1”
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Depending on length of the shirt, at least 3 positions should be known –chest, waist, hip
What happens during exercise?
© Hohenstein
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Differences in body geometry
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Movement Influences Body Measurement & Geometry
Relaxed ContractedChest girth 45.7 in 47.8 in
Waist girth 35.7 in 35.9 in
Chest width (contour) 17.5 in 17.6 in
Back width (contour) 18.7 in 22.5 in
Hohenstein Database
© Hohenstein
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HOSYcan Testing
© Hohenstein
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Body Results
© Hohenstein
Chest 1.32 mmHg // 116.1 cm
Waist 2.04 mmHg // 89.9 cm
Hip 2.00 mmHg // 110.0 cm
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Body Results
© Hohenstein
Chest1.74 mmHg // 120.9 cm 1.32 mmHg // 116.1 cm
+ 32 % // + 4%
Waist2.45 mmHg // 91.9 cm2.04 mmHg // 89.9 cm
+ 20% // + 2%
Hip2.13 mmHg // 110.0 cm2.00 mmHg // 110.0 cm
+ 7% // ± 0%
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Arm Compression
42.3 cm
40.3 cm
© Hohenstein
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Measurement Differences
Relaxed Flex low Flex medium Flex maximum
15.9 inch 16.0 inchIncrease: 0.98%
16.5 inchIncrease: 4.05%
16.7 inchIncrease: 4.73%
© Hohenstein
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HOSY Test
5. Stretch compressiongarment to specific girth
© Hohenstein
Simulating four flexes & back again
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Arm Results
• Relaxed state, no muscle contraction
• Compression is due to practical stretch (difference between table measure & wear size)
© Hohenstein
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Arm Results
• 2nd posture – 1st movement• Pressure curve changes
© Hohenstein
G
F
E
D
C1
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G
F
E
D
C1
Arm Results
• 3rd posture• New curve
© Hohenstein
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Arm Results
• 4rd posture• New curve
© Hohenstein
G
F
ED
C1
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Arm Compression Results
© Hohenstein
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Thank you
Ben MeadManaging DirectorHohenstein Institute America
Hohenstein.US