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Modified forelimb grip strength test detects aging-associated physiological decline in skeletal muscle function in male mice

2017; Nature Portfolio; Volume: 7; Issue: 1 Linguagem: Inglês

10.1038/srep42323

2045-2322

Hikari Takeshita, Kōichi Yamamoto, Satoko Nozato, Tadakatsu Inagaki, Hirotsugu Tsuchimochi, Mikiyasu Shirai, Ryohei Yamamoto, Yuki Imaizumi, Kazuhiro Hongyo, Serina Yokoyama, Masao Takeda, Ryosuke Oguro, Yoichi Takami, Norihisa Itoh, Yasushi Takeya, Ken Sugimoto, So‐ichiro Fukada, Hiromi Rakugi,

Exercise and Physiological Responses

The conventional forelimb grip strength test is a widely used method to assess skeletal muscle function in rodents; in this study, we modified this method to improve its variability and consistency. The modified test had lower variability among trials and days than the conventional test in young C57BL6 mice, especially by improving the variabilities in male. The modified test was more sensitive than the conventional test to detect a difference in motor function between female and male mice, or between young and old male mice. When the modified test was performed on male mice during the aging process, reduction of grip strength manifested between 18 and 24 months of age at the group level and at the individual level. The modified test was similar to the conventional test in detecting skeletal muscle dysfunction in young male dystrophic mice. Thus, the modified forelimb grip strength test, with its improved validity and reliability may be an ideal substitute for the conventional method.