2.6. Procedures
hand dynamometer
Grip strength was measured using a digital hand dynamometer, T.K.K. 5401 (Takei Scientific Instruments, Niigata, Japan). Leg strength was measured using T.K.K. 5715 and D.T.K.K. 5710e (Takei Scientific Instruments). Walking speed was measured via the modified method described previously [Gut flora was measured using “mykinso pro”, as previously reported [Feelings of happiness were measured by means of the WHO-5 Well-Being Index [