Dutch researchers suggest that there is a metabolic threshold at which long-term daily physical activity becomes deleterious for lumbar bone mineral density (LBMD) after peak bone mass is reached. This threshold occurs in young adulthood, say the investigators from the Institute for Research in Extramural Medicine at VU University Medical Centre in Amsterdam.
The metabolic aspects of physical activity also become ineffective for LBMD at that point, but they concluded physical activity causing mechanical loading on the skeleton has a small positive influence on LMBD in males aged from 27 to 36 years old.
The researchers investigated the longitudinal relationship over 10 years between daily physical activity and LBMD in 225 men and 241 women. Participants from the Amsterdam Growth and Health Longitudinal Study were measured at the mean ages of 27, 32 and/or 36 years. LMBD, habitual daily physical activity, total body weight and calcium intake were assessed at each measurement point.
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