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Effects of macronutrient intake on thigh muscle mass during home‐based walking training in middle‐aged and older women
Author(s) -
Okazaki K.,
Yazawa D.,
Goto M.,
Kamijo Y.I.,
Furihata M.,
Genno H.,
Hamada K.,
Nose H.
Publication year - 2013
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12076
Subject(s) - isometric exercise , medicine , hamstring , thigh , muscle strength , physical therapy , muscle mass , skeletal muscle , zoology , surgery , biology
We examined whether post‐exercise macronutrient supplementation during a 5‐month home‐based interval walking training ( IWT ) accelerated exercise‐induced increases in skeletal muscle mass and strength in healthy middle‐aged and older women. Thirty‐five women (41–78 years) were randomly divided into two groups: IWT alone ( CNT , n = 18) or IWT plus post‐exercise macronutrient (7.6 g protein, 32.5 g carbohydrate, and 4.4 g fat) supplementation ( NUT , n = 17). For IWT , all subjects were instructed to repeat five or more sets of 3‐min low‐intensity walking at 40% peak aerobic capacity ( Vo 2 peak ), followed by a 3‐min high‐intensity walking above 70% Vo 2 peak per day for 4 or more days per week. We determined Vo 2 peak , thigh muscle tissue area by computer tomography, and thigh muscle strength in all subjects before and after IWT . We found that an increase in hamstring muscle tissue area was 2.8 ± 1.2% in NUT vs −1.0 ± 0.7% in CNT and that in isometric knee flexion force was 16.3 ± 3.7% in NUT vs 6.5 ± 3.0% in CNT ; both were significantly higher in NUT than in CNT (both, P < 0.001). Thus, post‐exercise macronutrient supplementation enhanced the increases in thigh muscle mass and strength, although partially, in home‐based IWT in middle‐aged and older women.