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Table 1.

Force and timing parameters for forelimbs, hindlimbs and tail inAlligator mississippiensis

VariablesForelimbHindlimbPTail*
Support duration (s) 1.51±0.09 1.57±0.07 0.814 
Peak vertical force (BWU) 0.41±0.01 0.53±0.01 <0.0005** 0.08±0.01 
Vertical impulse (BWU·s) 0.36±0.02 0.51±0.02 0.005** 0.12±0.01 
Net craniocaudal impulse (BWU·s) -0.01±0.01 0.04±0.01 <0.0005** -0.03±0.01 
Braking impulse (BWU·s) -0.02±0.01 -0.01±0.01 0.001** -0.03±0.01 
Propulsive impulse (BWU·s) 0.01±0.01 0.05±0.03 0.002** 
Peak breaking force (BWU) -0.05±0.02 -0.05±0.02 0.414 -0.02±0.02 
Peak propulsive force (BWU) 0.04±0.03 0.07±0.03 0.001** 
Peak mediolateral force (BWU) 0.07±0.01 0.10±0.04 0.001** -0.02±0.01 
Net mediolateral impulse (BWU·s) 0.07±0.04 0.09±0.04 0.035 -0.01±0.01 
Relative time to peak vertical force (% support duration) 68.2±0.9 34.5±0.9 <0.0005** 
Relative time to braking-propulsion transition (% support duration) 62.0±1.0 15.2±0.7 <0.0005** 
VariablesForelimbHindlimbPTail*
Support duration (s) 1.51±0.09 1.57±0.07 0.814 
Peak vertical force (BWU) 0.41±0.01 0.53±0.01 <0.0005** 0.08±0.01 
Vertical impulse (BWU·s) 0.36±0.02 0.51±0.02 0.005** 0.12±0.01 
Net craniocaudal impulse (BWU·s) -0.01±0.01 0.04±0.01 <0.0005** -0.03±0.01 
Braking impulse (BWU·s) -0.02±0.01 -0.01±0.01 0.001** -0.03±0.01 
Propulsive impulse (BWU·s) 0.01±0.01 0.05±0.03 0.002** 
Peak breaking force (BWU) -0.05±0.02 -0.05±0.02 0.414 -0.02±0.02 
Peak propulsive force (BWU) 0.04±0.03 0.07±0.03 0.001** 
Peak mediolateral force (BWU) 0.07±0.01 0.10±0.04 0.001** -0.02±0.01 
Net mediolateral impulse (BWU·s) 0.07±0.04 0.09±0.04 0.035 -0.01±0.01 
Relative time to peak vertical force (% support duration) 68.2±0.9 34.5±0.9 <0.0005** 
Relative time to braking-propulsion transition (% support duration) 62.0±1.0 15.2±0.7 <0.0005** 

Values are means ± s.e.m. Sample sizes for limb and tail data are 30 and 17, respectively.

*

Tail impulses are estimated over the mean support duration of the limbs(1.54 s)

**

Fore- and hindlimbs significantly different at P<0.006,established by sequential Bonferroni correction α/k=0.05/9

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