Abstract
This study examined the relationship between selected mechanical characteristics of aluminum baseball bats and sensations on the hands resulting from impacts. Sixteen skilled male Little League baseball players held each of two bats while they were impacted at the following locations by baseballs at speeds of approximately 27 m/s: near barrel end, center of percussion (COP), distal node of the fundamental mode, and 4 in. toward the hands from the COP. Results of a questionnaire regarding annoyance and discomfort were correlated with selected bat characteristics and vibrational characteristics associated with each impact condition. Results indicated that perceptions of annoyance and discomfort were related to the level of excitation of the fundamental mode and first overtone mode and that annoyance and discomfort were less with impacts on the COP and fundamental vibrational node.
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