Effekt på kroppssammansättning av naturligt åldrande

[King Grub]

Obesity and sarcopenia are health problems associated with ageing. The present study modelled the longitudinal changes in body composition of healthy men, aged from 20 to 96 years, and evaluated the fidelity of BMI to identify age-dependent changes in fat mass and fat-free mass. The data from 7265 men with multiple body composition determinations (total observations 38 328) were used to model the age-related changes in body mass, fat mass, fat-free mass, BMI and percentage of body fat. Changes in fat mass and fat-free mass were used to evaluate the fidelity of BMI and to detect body composition changes with ageing. Linear mixed regression models showed that all trajectories of body composition with healthy ageing were quadratic. Fat mass, BMI and percentage of body fat increased from age 20 years and levelled off at approximately 80 years. Fat-free mass increased slightly from age 20 to 47 years and then declined at a non-linear rate with ageing. Levels of aerobic exercise had a positive influence on fat mass and a slight negative effect on fat-free mass. BMI and percentage of body fat were sensitive in detecting the increase in fat mass that occurred with healthy ageing, but failed to identify the loss of fat-free mass that started at age 47 years.

Br J Nutr. 2011 Aug 3:1-7. Longitudinal changes in body composition associated with healthy ageing: men, aged 20-96 years.

[Mannus]

Mycket intressant. Män är alltså generellt sett starkare vid 47 års ålder än vid 20 års ålder. Inte så förvånande, kanske, med tanke på att de generellt även var större och fetare, och antagligen har tränat eller jobbat en del, men ändock intressant. Särskilt för vuxna män som undrar om det inte är värt att börja styrketräna, för att det är "för sent".

[oddyboll]

så behöver det inte alls vara. fettfri massa består av mer än bara muskler

[Mannus]

så behöver det inte alls vara. fettfri massa består av mer än bara muskler Jaså? Så pass?

[Anders The Peak]

Short-Term Heavy Resistance Training Eliminates Age-Related Deficits in Muscle Mass and Strength in Healthy Older Males (http://journals.lww.com/nsca-jscr/Abstract/2011/02000/Short_Term_Heavy_Resistance_Training_Eliminates.6. aspx)

Abstract
Candow, DG, Chilibeck, PD, Abeysekara, S, and Zello, GA. Short-term heavy resistance training eliminates age-related deficits in muscle mass and strength in healthy older males. J Strength Cond Res 25(2): 326-333, 2011-The objective of this investigation was to determine whether short-term heavy resistance training (RT) in healthy older men could eliminate deficits in muscle mass and strength (ST) compared with healthy younger men. Seventeen older men (60-71 yr) performed supervised RT for 22 weeks. Before and after RT, measurements were made for lean tissue mass (LTM), muscle thickness (MT), and ST (leg and bench press 1 repetition maximum) and were compared with values of younger men (n = 22-60 for the different measures, 18-31 yr). Before training, older men had significantly lower (p < 0.05) LTM (58.4 ± 7.0 kg), MT (3.4 ± 0.7 cm), and ST (leg press = 168 ± 33 kg; bench press = 75 ± 18 kg) compared with younger men (LTM 64.3 ± 7.1 kg; MT 4.0 ± 0.8 cm; leg press = 231 ± 54 kg; bench press = 121 ± 31 kg). All deficits were eliminated after 22 weeks of RT (LTM = 60.5 ± 7.6 kg; MT = 4.0 ± 0.7 cm; leg press = 222 ± 48 kg; bench press = 107 ± 19 kg). Short-term, heavy RT in healthy older men is sufficient to overcome deficits in muscle mass and ST when compared with healthy younger men. The practical application from this research is that healthy older men can be prescribed a whole-body heavy RT program to substantially increase muscle mass and ST to levels similar to young, active individuals.