Competitive Weight Lifters Often Try to Exceed Their Own Limits

Multiple Choice

Competitive weight lifters often try to exceed their own limits of performance by lifting heavier and heavier weights. Dwight is attempting to set his new personal record on the bench press and as he lowers the bar to his chest, he pushes it back up about halfway and begins to struggle. His spotter waits for two seconds while Dwight continues to work by himself, and suddenly the bar begins to move upwards again until it is fully extended, without the intervention of the spotter. Describe the types of muscle contractions that occurred while Dwight was struggling and while he followed through, respectively.

A) isometric, eccentric isotonic
B) isotonic, concentric isometric
C) eccentric, concentric isotonic
D) iosmetric, concentric isotonic