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Effect of very low‐intensity resistance training with slow movement on muscle size and strength in healthy older adults
Author(s) -
Watanabe Yuya,
Madarame Haruhiko,
Ogasawara Riki,
Nakazato Koichi,
Ishii Naokata
Publication year - 2014
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12117
Subject(s) - isometric exercise , medicine , eccentric , concentric , muscle hypertrophy , sarcopenia , one repetition maximum , intensity (physics) , physical therapy , resistance training , physical medicine and rehabilitation , cardiology , geometry , mathematics , quantum mechanics , physics
Summary We previously reported that low‐intensity [50% of one repetition maximum (1 RM )] resistance training with slow movement and tonic force generation ( LST ) causes muscle hypertrophy and strength gain in older participants. The aim of this study was to determine whether resistance training with slow movement and much more reduced intensity (30%1 RM ) increases muscle size and strength in older adults. Eighteen participants (60–77 years) were randomly assigned to two groups. One group performed very low‐intensity (30% 1 RM ) knee extension exercise with continuous muscle contraction ( LST : 3‐s eccentric, 3‐s concentric, and 1‐s isometric actions with no rest between each repetition) twice a week for 12 weeks. The other group underwent intermitted muscle contraction ( CON : 1‐s concentric and 1‐s eccentric actions with 1‐s rest between each repetition) for the same time period. The 1 RM , isometric and isokinetic strengths, and cross‐sectional image of the mid‐thigh obtained by magnetic resonance imaging were examined before and after the intervention. LST significantly increased the cross‐sectional area of the quadriceps muscle (5·0%, P <0·001) and isometric and isokinetic knee extension strengths ( P <0·05). CON failed to increase muscle size (1·1%, P = 0·12), but significantly improved its strength ( P <0·05). These results indicate that even if the intensity is as low as 30% 1 RM , LST can increase muscle size and strength in healthy older adults. The large total contraction time may be related to muscle hypertrophy and strength gain. LST would be useful for preventing sarcopenia in older individuals.