ISSN:
1432-136X
Schlagwort(e):
Key words Locomotor performance
;
Muscle fibre
;
Power
;
Thermal sensitivity
;
Abbreviationsα Jump take-off angle
;
θ Angle between the knee-vent line and the saggital plane
;
ATP adenosine tri-phosphate
;
a acceleration
;
b constant used in non-linear fitting algorithm of SYSTAT
;
BL body length
;
c constant used in non-linear fitting algorithm of SYSTAT
;
D distance covered in five consecutive jumps
;
DF maximum diameter of leg at femur ( includes semimembranosus, sartorius, biceps femoralis, extensor cruris)
;
DT maximum diameter of leg at tibia (gastrocnemius, peroneus, and tibialis)
;
EMG electromyography
;
F force produced by muscle
;
FTO force in the direction of take-off
;
IND individual
;
LF length of femoral section of leg
;
LL total leg length from hip to toe
;
LP locomotory parameter
;
LT length of tibial section of leg
;
M body mass
;
MSV mean swimming velocity
;
NA data not available
;
o constant used in non-linear fitting algorithm of SYSTAT
;
P mean power required during jump take-off
;
t time
;
TE body temperature
;
V jump take-off velocity
;
x′ corrected jump distance
;
y′ height from surface to center of mass at take-off
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Abstract The aims of this study were: (1) to analyze individual variation in frog locomotor performance, (2) to compare the thermal sensitivity of jumping and swimming, and (3) to contrast whole animal versus muscle fiber performance at different temperatures. The jumping and swimming performance of Rana temporaria was analyzed at 5, 10, 15 and 20 °C. Muscle fiber bundles were isolated from lateral gastrocnemius and subjected to the length and activation patterns thought to occur in vivo. As temperature increased, locomotor performance in R. temporaria improved with a Q 10 of 1.2 for both jump take-off velocity and mean swimming velocity. The slope of the relationship between performance and temperature (TE) was similar for both locomotor parameters and was described by the equation z-scores of locomotor performance = 0.127 × TE − 1.585. Although some frogs performed better than others relative performance was affected by locomotor type and temperature. Locomotor performance improved with temperature as the power required during take-off and the mean muscle power output increased with Q 10 values of 1.7 and 1.6 respectively. The mean muscle power output during take-off was only 34% of the calculated requirements for the whole animal, suggesting the involvement of elastic strain energy storage mechanisms.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s003600050259
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