A new method for evaluating pelvic and trunk rotational pitching mechanics: From qualitative to quantitative approaches

Yu Chuan Lin, Paul Pei Hsi Chou, Hwai Ting Lin, Fong Chin Su, Chia Lung Shih, Cheng Chang Lu

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study was to build on existing qualitative to quantitative approaches to develop a new quantitative method for evaluating pelvic and trunk rotational pitching mechanics. Thirty pitchers were divided into two groups (“Pattern1”: closed “hip-to-shoulder separation”; “Pattern2”: open “hip-to-shoulder separation”). Several parameters were analyzed. Higher ball speeds were found in group of Pattern1, four key characteristics of which were identified. Based on the results, a new evaluation method was developed. Pelvic and trunk rotational mechanics were classified into four types. Type1 (proper mechanics) enabled significantly higher ball speed than the other three types and was thought to involve proper energy transfer from the stride foot to the throwing upper limb. Types2–4, however, were regarded as “improper mechanics”, which could result in slower ball speeds and less efficient energy transfer. A qualitative approach, based on “expert opinion”, can specify optimal pelvis and trunk rotational mechanics. However, quantitative analysis is more precise in identifying three improper types of pelvis and trunk rotational mechanics. Furthermore, special programs, such as core strengthening and flexibility training, can be developed for various improper practices in order to improve pitching mechanics.

Original languageEnglish
Article number905
Pages (from-to)1-15
Number of pages15
JournalInternational journal of environmental research and public health
Volume18
Issue number3
DOIs
Publication statusPublished - 2021 Feb 1

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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