Obesity and handling : unspoiled ability of lifting but lower aerobic capacities.
Dr Florence DOURY-PANCHOUTa, Dr Julien NARDOUXa, Dr Jean-Charles MÉTIVIERb, Prof Bernard FOUQUETa
a CHU Tours, b CHIC Château-Renault
Background : The rise of the prevalence of obesity in France is more important for blue collars (workers, farmers) than white collars, and these patients are particularly exposed to activities of lifting.
Objective : The principal objective of this study is to search differences in abilities of maximal lifting, aerobic capacities and endurance of the spinal extensors, which are determinants of ability of lifting, between obese and non obese patients with chronic musculoskeletal pain.
Material and Methods : A progressive iso-inertial lifting evaluation, a Sorensen test and a cycloergometer exercise test with VO2 measurement were performed on 321 patients hospitalized in the unit of Physical Medicine and Rehabilitation of the hospital of Château-Renault for rehabilitation for a chronic pain syndrome.
Results : The maximum weight lifted during PILE test (in kilogrammes) was more important in obese patients (n = 65) than in non obese patients (n = 166), and the difference was in the limit of significativity (p = 0.0472). On the other hand, the maximal weight lifted during PILE test in percentage of body weight was more important in non obese patients than in obese patients (p = 0.0397). There was non significant difference in the relative cardiac cost between obese and non obese patients for this test. There was no significant difference in the results of Sorensen test and relative cardiac cost of Sorensen test between obese and non obese patients. On the other hand, the VO2max and VO2 at the aerobic threshold (SV1) were significantly lower in obese patients (respectively p = 0.0001 and p = 0.0489).
Discussion : The ability of lifting keeps is unspoiled in obese patients, considering absolute value, but the aerobic capacities are lower than non obese patients, which shows a lower resistance to tiredness in obese patients, probably in relation to insulin resistance of skeletal muscle.
Keywords : obesity, lifting, VO2max, chronic pain