The sub-acute effects of high-intensity interval training in healthy young adults: respiratory parameters, aerobic capacity and perceived stress.

BACKGROUND: Although the effects of sub-maximal continuous aerobic training (SCT) and high-intensity interval training (HIIT) are well studied in performance athletes and in several patient groups, there is not much evidence about the effects of these exercises in sedentary healthy young population. The aim of the study was to compare the effects of these two different types of aerobic exercises on respiratory parameters, aerobic capacity and perceived stress in healthy university students. METHODS: Thirty-six healthy, young subjects with a mean age of 20.83±0.97 years were included in the study (N.=19 in HIIT and N.=17 in SCT). Pulmonary function tests (PFTs) and respiratory muscle strength (RMS) assessments were done using a desktop spirometer. Aerobic capacity was estimated with the Bruce treadmill exercise test. The Perceived Stress Scale (PSS) was used for the assessment of stress perception. All participants exercised 3 times per week for 4 weeks (a total of 12 sessions). RESULTS: After 12 sessions, the peak expiratory flow parameter (a PFT value) of both groups showed significant increases, but there was no difference between the groups. The RMS of the subjects increased significantly in both the groups (P<0.05), but there was no significant difference between the groups. Both groups showed significant increases in terms of aerobic capacity (P>0.05), and the improvement was significantly higher in the HIIT group. Perceived stress values showed a significant increase in the SCT group. CONCLUSIONS: Based on the results of this study, the two exercise types were found to have similar effects on RMS. Also, when compared with SCT, HIIT was found to have more effect on aerobic capacity.

Postoperative respiratory muscle training in addition to chest physiotherapy after pulmonary resection: A randomized controlled study.

Purpose: The effects of preoperative respiratory muscle training (RMT) on postoperative complications in patients with pulmonary resection have recently attracted the attention of researchers. More studies are obviously needed to clarify the effects of RMT after pulmonary resection. The aim of this study was to evaluate the effectiveness of intense RMT in addition to chest physiotherapy after pulmonary resection in terms of respiratory muscle strength, exercise capacity, and length of hospital stay rather than postoperative complications. Methods: Forty subjects undergoing pulmonary resection were included in the study. Subjects were divided into two groups using a simple randomization method. The subjects in the study group (SG; n = 20) received RMT in addition to regular chest physiotherapy in the postoperative period. The subjects in the control group (CG; n = 20) received only regular chest physiotherapy. Respiratory muscle strength (maximal inspiratory and expiratory pressure [PImax and PEmax]) was measured pre-postoperatively and before discharge, and exercise capacity, which was measured by the 6-min walk test (6MWT), was assessed preoperatively and before discharge. The length of hospital stay was also recorded. Results: There were no differences between groups in terms of demographic and surgical characteristics. The nonsignificant change of PImax from the preoperative to the discharge value was 65.1 ± 15.5 to 68.2 ± 19.2 cmH2O in SG and 59.2 ± 13.7 to 44.3 ± 14.8 cmH2O in CG (p > 0.05, p > 0.05, respectively). The change of PEmax from the preoperative to the discharge value was 80.4 ± 24.9 to 81.5 ± 24.9 cmH2O in SG (nonsignificant) and 85.4 ± 38.2 to 61.3 ± 25.4 cmH2O in CG (p > 0.05, p = 0.002, respectively). There was a significant difference between SG and CG in terms of RMT effect (PImax: 11.05 [21.84; 0.25] cmH2O p = 0.045; PEmax: 25.23 [42.83; 7.62] cmH2O p = 0.006). A significant difference was found in the 6MWT when the mean differences were compared between the groups (85.72 [166.15; 5.28] m p = 0.037). The length of hospital stay was significantly shorter in the SG (number of days for SG 9.1 ± 3 and for CG 12.9 ± 4.2 [p = 0.002]). Conclusion: The addition of RMT to chest physiotherapy after pulmonary resection can have positive effects on respiratory muscle strength, exercise capacity, and length of hospital stay.