Table 3.

Correlates of total appendicular lean mass by age group. Fisher r-to-z transformations were performed to assess the significance of between-group differences in correlation coefficients

Variable	Young (n = 50)	Older (n = 50)	Z score	P value
Body composition
Fat mass (kg)	− 0.16	0.45**	− 3.13	0.002
Lean mass (kg)	0.99**	0.88**	6.16	< 0.001
%TFM	− 0.56**	− 0.21	− 2.03	0.042
Strength, muscle quality and functional performance
Dominant HGS (kg)	0.78**	0.79**	− 0.13	0.897
Non-dominant HGS (kg)	0.78**	0.79**	− 0.13	0.897
Dominant leg extension 1RM (kg)	0.87**	0.71**	2.16	0.031
Non-dominant leg extension 1RM (kg)	0.83**	0.74**	1.15	0.250
Upper-body MQ (kg/kg)	− 0.61**	− 0.31*	− 1.88	0.060
Lower-body MQ (kg/kg)	0.51**	− 0.04	2.92	0.004
6-m gait speed (m/s)	− 0.14	0.00	− 0.68	0.497
Physical activity
Walking (min/week)	− 0.03	− 0.17	0.69	0.490
Moderate (min/week)	− 0.13	− 0.21	0.40	0.689
Vigorous (min/week)	0.08	0.18	− 0.49	0.624
Total (MET-min/week)	− 0.03	− 0.05	0.01	0.920

%TFM percentage tissue fat mass, 1RM one repetition maximum, ALM appendicular lean mass, HGS handgrip strength, MET metabolic equivalent, MQ muscle quality

*Significant at P < 0.05; **significant at P < 0.01