Search PubMed⌕ Search

Biomedical subjects

L Cordain

Publications and source records attributed to L Cordain.

40 records · Page 3Linked to original sources
PubMed1987

Maximal respiratory pressures and pulmonary function in male runners.

To determine the effects of long term exercise on respiratory muscle strength, maximal inspiratory (Pl max) and expiratory (PE max) pressures, pulmonary volumes and capacities and anthropometric parameters were measured in a group of 101 male runners aged 16 to 58 years. The runners exhibited significantly (p less than 0.05) lower PE max (202 +/- 41 cm H2O and significantly greater residual lung volumes (RV) (2.08 +/- 0.49 L) than predicted values for normal subjects of similar height and age. Forced vital capacities were not different (p greater than 0.05) from values reported for normal non-smoking populations. These data suggest that running may cause a non-pathological increase in RV, perhaps mediated by reductions in expiratory muscle strength. Additionally, current RV regression equations developed for normal subjects may be inappropriate for use in running populations.

Adolescent↗
PubMedDate not supplied

Arterial O2 saturation and maximum O2 consumption in moderate-altitude runners exposed to sea level and 3,050 m.

Twelve trained runners, who were moderate-altitude (1,520 m) residents, were acutely exposed to sea level and 3,050-m altitude in a hypo-hyperbaric chamber. At 1,520 m, maximum O2 consumption (VO2 max) was 67.7 +/- 0.9 mL/kg/min, minute ventilation (V) at maximum exercise was 169.8 +/- 4.6 L/min, and arterial O2 saturation (SaO2) decreased from 93.3% +/- 0.9% at rest, to 84.5% +/- 1.6% at maximum exercise. Exposure to 3,050 m produced a lower VO2max (56.5 +/- 1.5, -16.5%), a similar V at maximum exercise (169.9 +/- 6.0), and a similar fall in SaO2 (from 89.1% +/- 0.8% to 79.5% +/- 0.8%). Exposure to sea level increased VO2max to 72.4 +/- 1.4 (+6.9%), reduced V at maximum exercise to 158.8 +/- 6.5, and induced a smaller fall in SaO2 (from 96.9% +/- 0.4% to 92.1% +/- 1.0%). These changes are comparable with those reported previously in athletes at sea level exposed to similar altitudes, suggesting that residence at 1,520 m does not improve VO2max in highly trained athletes acutely exposed to lower or higher altitudes.

Adolescent↗