TY - JOUR

T1 - Postnatal changes in electromyographic signals during piglet growth, and in relation to muscle fibre types

AU - Andersen, Ninette Kieme

AU - Ravn, L.S.

AU - Guy, J.H.

AU - Edwards, S.A.

AU - Harrison, Adrian Paul

PY - 2008

Y1 - 2008

N2 - This study uses non-invasive evoked surface electromyography (SEMG) to investigate postnatal muscle development in pigs, and to assess any correlation between recorded signal parameters and muscle fibre types in two different skeletal muscles. Four litters (n=43) of Large White x Landrace pigs were used. Evoked SEMG mesurements were taken on days 2, 5, 14, 26, 60 and 151 post partum from m. Longissimus dorsi (LD) and on days 14, 26, 60 and 151 post partum from m. Biceps femoris (BF). A third of each litter was slaughtered at days 27, 61 and 153 post partum. Biopsy samples for LD and BF were taken to categorize day 5 post partum, whilst for BF significant increases occurred from days 14 to 26 post partum. Fibre type development in both muscles showed a significant decrease in type IIA fibre number (P<0.001) and an increease in type IIB fibre number (P<0.001). Analysis of CMAP parameters in relation to fibre type percentages showed significant positive correlations between percentage of type I fibres in BF and CMAP Area (r=0.71; P=0.05), SlopeL (r=0.79; P=0.02) and Corr Peak (r=0.78; P=0.02) and a negative correlation with SlopeT (r=0.89; P=0.003) at day 151. A greater CMAP Area and Corr Peak as well as steeper leading and trailing slopes were on the other hand correlated to fewer type IIB fibres.It is concluded that 1) changes in the evoked CMAP are muscle-specific during early postnatal development in the pig, and 2) in spite of a small sample size, the correlations between CMAP signal parameters and fibre type percentages warrant further investigation.

AB - This study uses non-invasive evoked surface electromyography (SEMG) to investigate postnatal muscle development in pigs, and to assess any correlation between recorded signal parameters and muscle fibre types in two different skeletal muscles. Four litters (n=43) of Large White x Landrace pigs were used. Evoked SEMG mesurements were taken on days 2, 5, 14, 26, 60 and 151 post partum from m. Longissimus dorsi (LD) and on days 14, 26, 60 and 151 post partum from m. Biceps femoris (BF). A third of each litter was slaughtered at days 27, 61 and 153 post partum. Biopsy samples for LD and BF were taken to categorize day 5 post partum, whilst for BF significant increases occurred from days 14 to 26 post partum. Fibre type development in both muscles showed a significant decrease in type IIA fibre number (P<0.001) and an increease in type IIB fibre number (P<0.001). Analysis of CMAP parameters in relation to fibre type percentages showed significant positive correlations between percentage of type I fibres in BF and CMAP Area (r=0.71; P=0.05), SlopeL (r=0.79; P=0.02) and Corr Peak (r=0.78; P=0.02) and a negative correlation with SlopeT (r=0.89; P=0.003) at day 151. A greater CMAP Area and Corr Peak as well as steeper leading and trailing slopes were on the other hand correlated to fewer type IIB fibres.It is concluded that 1) changes in the evoked CMAP are muscle-specific during early postnatal development in the pig, and 2) in spite of a small sample size, the correlations between CMAP signal parameters and fibre type percentages warrant further investigation.

KW - Former LIFE faculty

KW - Porcine

KW - EMG

KW - Fibre type

KW - Skeletal muscle

KW - B. femoris

KW - L. dorsi

U2 - 10.1016/j.livsci.2007.08.004

DO - 10.1016/j.livsci.2007.08.004

M3 - Journal article

VL - 115

SP - 301

EP - 312

JO - Livestock Science

JF - Livestock Science

SN - 1871-1413

IS - 2-3

ER -