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Table 1.

Patterns of hind limb muscle activity for alligators walking at 0.146 m s−1

MuscleAbbrevationOnset (%)Offset (%)N
Flexor tibialis externus FTE 0.9±3.0 52.6±4.5 
Flexor tibialis internus 2* FTI2 −6.0±4.6 37.3±12.0 2* 
Caudofemoralis longus* CFL −6.0±0.0 55.9±0.0 4* 
Iliotibialis 1 ILTIB1 −18.0±6.5 38.0±7.3 
Iliotibialis 2 ILTIB2 −10.9±7.2 52.3±5.3 
Femorotibialis internus FMTI −8.4±1.9 48.2±3.2 
Adductor femoris 1 ADD1 −9.4±4.1 38.7±5.5 
Puboischiotibialis (stance burst) PIT −16.7±2.5 38.6±2.6 
(swing burst) PIT 67.2±3.9 79.5±2.4 
Puboischiofemoralis externus 3 PIFE3 −6.0±2.7 48.1±4.1 
Gastrocnemius 3.7±5.9 63.4±4.9 
Iliofibularis* ILFIB 66.1±5.5 84.0±3.0 3* 
Iliofemoralis ILFEM 63.6±2.3 78.3±1.4 
Puboischiofemoralis internus 2 PIFI2 67.6±6.5 92.7±3.4 
Puboischiofemoralis externus 2* PIFE2 75.9±8.7 91.6±5.1 2* 
Ambiens 1 AMB1 78.0±3.8 97.3±1.8 
Tibialis anterior TA 68.1±4.2 91.2±3.0 
MuscleAbbrevationOnset (%)Offset (%)N
Flexor tibialis externus FTE 0.9±3.0 52.6±4.5 
Flexor tibialis internus 2* FTI2 −6.0±4.6 37.3±12.0 2* 
Caudofemoralis longus* CFL −6.0±0.0 55.9±0.0 4* 
Iliotibialis 1 ILTIB1 −18.0±6.5 38.0±7.3 
Iliotibialis 2 ILTIB2 −10.9±7.2 52.3±5.3 
Femorotibialis internus FMTI −8.4±1.9 48.2±3.2 
Adductor femoris 1 ADD1 −9.4±4.1 38.7±5.5 
Puboischiotibialis (stance burst) PIT −16.7±2.5 38.6±2.6 
(swing burst) PIT 67.2±3.9 79.5±2.4 
Puboischiofemoralis externus 3 PIFE3 −6.0±2.7 48.1±4.1 
Gastrocnemius 3.7±5.9 63.4±4.9 
Iliofibularis* ILFIB 66.1±5.5 84.0±3.0 3* 
Iliofemoralis ILFEM 63.6±2.3 78.3±1.4 
Puboischiofemoralis internus 2 PIFI2 67.6±6.5 92.7±3.4 
Puboischiofemoralis externus 2* PIFE2 75.9±8.7 91.6±5.1 2* 
Ambiens 1 AMB1 78.0±3.8 97.3±1.8 
Tibialis anterior TA 68.1±4.2 91.2±3.0 

Mean timing variables (±s.d.) are measured relative to the time of foot down for each stride and scaled to stride duration. Ten strides per individual averaging 51° of femoral adduction angle at mid-stance and 70% duty factor are included for each individual(N) per muscle. These patterns are illustrated relative to other aspects of limb dynamics in Fig. 3F.

*

Data for muscles studied by Gatesy(1997) moving at similar speeds (0.1-0.15 m s−1) and posture (60° femoral adduction angle).

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