Insole for Insole for Marathoners Marathoners

pilot studypilot study-for normal subjects--for normal subjects-

Chao-Yi, ZhengChao-Yi, ZhengSai-Wei, YangSai-Wei, Yang

outlineoutline

• InstrumentsInstruments• Method and procedureMethod and procedure• ResultsResults• ConclusionConclusion

instrumentsinstruments

• PedarPedar– Center of pressureCenter of pressure– Pressure distributionPressure distribution

• Rs scanRs scan– Static balanceStatic balance

Methods and Methods and proceduresprocedures

• Absorption and dynamic stabilityAbsorption and dynamic stability– Instrument: Pedar system, treadmillInstrument: Pedar system, treadmill– Condition: insole and shoe, random, each for thrCondition: insole and shoe, random, each for thr

ee trialsee trials– Procedure: Procedure:

• Subject ran on the treadmill, the speed gradually increaSubject ran on the treadmill, the speed gradually increased to 3.35 m/ssed to 3.35 m/s

• When subject get with that speed, recorded data for 20 sWhen subject get with that speed, recorded data for 20 stepsteps

– Variables:Variables:• Standard deviation of Cop X Standard deviation of Cop X • Peak pressure and maximal force at heel (m, l), midfoot Peak pressure and maximal force at heel (m, l), midfoot

(m, l), mp (1,2,345), toe (1, 2, 345)(m, l), mp (1,2,345), toe (1, 2, 345)

• Static balance:Static balance:– Instrument: Rs scanInstrument: Rs scan– Condition: (bare, shoe, insole) X (right, lefCondition: (bare, shoe, insole) X (right, lef

t) , each for five trialst) , each for five trials– Procedure: Procedure:

• To use tandem gait stand for 30s for each conditTo use tandem gait stand for 30s for each conditionion

– Variable:Variable:• Cop X, Cop Y, Cop total travel way, elliptical areCop X, Cop Y, Cop total travel way, elliptical are

a a

resultsresults

AbsorptionAbsorption

Maximum force and peak Maximum force and peak pressurepressure

1: insole Left foot 3: shoe Left foot

2: insole Right foot 4: shoe Right foot

resultsresults

Support and stabilitySupport and stability

Insole_Subject 1Insole_Subject 1

Noinsole_Subject 1Noinsole_Subject 1

Insole_Subject 2Insole_Subject 2

Noinsole_Subject 2Noinsole_Subject 2

• Dynamic balanceDynamic balance

ConclusionConclusion

• Pressure distribution:Pressure distribution:– Maximum force M2 Maximum force M2 ：： right foot wearing insole may lright foot wearing insole may l

ower than wearing shoeower than wearing shoe– Peak pressure M345 Peak pressure M345 ：： it may has different between tit may has different between t

wo legs with insolewo legs with insole ；； right insole and left shoe may haright insole and left shoe may have differentve different

• Dynamic stabilityDynamic stability ：： it may has different between it may has different between these two conditions, the SD value in insole is bi these two conditions, the SD value in insole is bigger than insole but the bias is very small(0.03)gger than insole but the bias is very small(0.03)

• Static stabilityStatic stability ： ： it seems has no different betweit seems has no different between wearing insole and without insoleen wearing insole and without insole