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Inspiratory strengthening effect on resistive load detection and magnitude estimation

2000; Lippincott Williams & Wilkins; Volume: 32; Issue: 11 Linguagem: Inglês

10.1097/00005768-200011000-00007

1530-0315

Barbara Kellerman, A. Daniel Martin, Paul W. Davenport,

Cardiovascular Effects of Exercise

KELLERMAN, B. A., A. D. MARTIN, and P. W. DAVENPORT. Inspiratory strengthening effect on resistive load detection and magnitude estimation. Med. Sci. Sports Exerc., Vol. 32, No. 11, pp. 1859–1867, 2000. Purpose This study investigated effects of inspiratory muscle training (IMT) on maximal inspiratory pressure (MIP), magnitude estimation (ME), and load detection (LD) of external resistive loads (ΔR) in healthy subjects. Methods Ten adult volunteers IMT trained 5 d·wk−1 for 4 wk. A training set consisted of six inspiratory efforts at 75% of MIP; daily training trials consisted of four sets. ME was calculated by linear regression, with actual and estimated ΔR loads plotted on log-log scale. LD was calculated by determining ΔR50/Ro fraction. Dependent measures were taken pre- and post-IMT. Results MIP significantly increased from 87 to 139 cmH2O pre- to post-IMT, respectively. ME for individual loads significantly decreased post-IMT for all but the highest ΔR. There was no significant difference in LD ΔR50/Ro post-IMT. Conclusions The results demonstrate that inspiratory muscle strength gains were associated with decreased ME of ΔRs without changing LD ΔR50/Ro. This suggests that the mechanisms mediating the detection of ΔRs may be different than the mechanisms for estimating ΔR size.