A 72 kg individual is in a seated position on a machine that tests knee extension strength. The calf length is 0.400 m, calf/foot mass is 5.8% of the body mass, calf/foot center of mass is 53% of the calf length from the knee joint, and calf/foot moment of inertia about the knee joint is 0.311 kgm2. The quadriceps moment arm is 0.040 m. The machineâs padding contacts the calf at a constant moment arm (does not change with knee angle) of 0.378 m from the knee joint.Â
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1.) At zero machine resistance, the knee joint angle is held at a constant 0ï° (full extension) with the calf in a horizontal position. How much quadriceps muscle force is being generated?
A. 22 N
B. 41 N
C. 52 N
D. 217 NÂ
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2.) Still at zero machine resistance, the knee joint angle is held at a constant 50ï° below the horizontal (knee flexion). How much quadriceps muscle force is being generated?
A. 14 N
B. 140 N
C. 166 N
D. 217 NÂ
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3.) After setting the machine resistance to 210 N, the knee joint angle is held at a constant 50ï° below the horizontal. How much quadriceps muscle force is being generated?
A. 1985 N
B. 1999 N
C. 2124N
D. 2202 NÂ
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4.) With a machine resistance of 210 N, the knee joint angle is 50ï° below the horizontal and has
an angular acceleration of 15 rad/s2. How much quadriceps muscle force is being generated?
A. 2007 N
B. 2115 N
C. 2241 N
D. 2318 NÂ
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5.)Â What type of muscle contraction is occurring as the knee is extending in part 4.)?
A. concentric hamstrings
B. isometrichamstrings
C. concentricquadriceps
D. eccentric quadricepsÂ
Answers
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Posted 08 May 2017 04:05 AM
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