{'fraction_non_alphanumeric': 0.0715953307392996, 'fraction_numerical': 0.05992217898832685, 'mean_word_length': 4.577006507592191, 'pattern_counts': {'":': 0, '<': 6, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Whole body exercise training improves blood pressure and postural balance responses during orthostatic stress onset in older women

The purpose of the current study was to investigate the effects of whole body exercise training on spontaneous baroreflex sensitivity at rest, blood pressure and postural balance responses during orthostatic onset in older women. The sample composed by eight healthy older women (65±3 yrs.). R‐R intervals and blood pressure were continuously measured from a standard electrocardiogram (ECG) and infrared finger plethysmography, respectively, at rest (10min) and during orthostatic position (7min). Spontaneous baroreflex sensitivity at rest was obtained by spectral method in the low‐frequency component of R‐R and systolic blood pressure time series (αLF). The nadir point was considered the lower value of mean arterial pressure (MAP) during transition from supine to orthostatic position. The percentage changes (%ΔMAP) from supine to orthostatic nadir were calculated. The time of MAP oscillations during orthostatic onset (MAPtime) was calculated by the sum of time to nadir and time to recovery (nearest value of MAP at rest). In addition, during the ORT onset (15s) the center of pressure displacements (COP) were acquired by a force plate, and COP distance and speed were calculated. The whole body exercise training protocol (rowing ergometer) consisted of three weekly sessions (30 minutes) at 60–80% of maximal heart rate (defined by a previous maximal exercise test) for 10 weeks. The volunteers were evaluated pre and post‐trainning. Student‐t tests for paired samples was employed (p≤0.05) to compare all variables. At rest, αLF (pre= 3.9 ±1.7 vs. post= 5.3 ±1.1 ms2 p<0.001) increased post‐training and MAP (pre= 85.1 ±10.3 vs. post= 77.4 ±7.8 mmHg p< 0.02) decreased. No differences in CO (pre= 4.526 ±0.7697 vs. post= 5.058 ±2.104 L/min p=0.02) and SV (pre= 66.33 ±19.94 vs. post= 72.18 ±29.67 mL p=0.01) were found at rest. Although %ΔMAP (pre= −0.3 ±0.2 vs. post= −0.3 ±0.16 mmHg p< 0.19) was not different pre and post training, MAPtime (pre= 14.16 ±3.996 vs. post= 10.94 ±5.637 seconds p<0.04) decreased post‐training protocol. Moreover. COP distance (pre= 673.7 ±74.9 vs. post= 560.3 ±95.1 mm p< 0.03) and speed (pre= 44.9 ±4.9 vs. post= 37.3 ±6.3 mm/s p<0.03) were lower post‐training. Whole body exercise training improves spontaneous baroreflex sensitivity at rest mean arterial pressure and postural balance adjustments during orthostatic stress onset in older women. Research ethics committee (CEP‐851.371/14).