Content » Vol 47, Issue 1

Letter to the Editor

Response to the Short Communication: Effect of interval training on cognitive functioning and cerebral oxygenation in obese patients: A pilot study

It is likely that the use of stroke volume index and cardiac index in lieu of stroke volume (SV) and cardiac output (CO) could have resulted in larger changes due to training-related weight loss. Normalizing SV and CO with lean body mass might also have been an interesting avenue (as the authors have shown with VO2max and VO2 at the ventilatory threshold (VT)).

Accepted Oct 31, 2014; Epub ahead of print Dec 1, 2014

Frank Bour, CEO,

PhysioFlow Inc. USA/Manatec Biomedical France, Poissy, France. E-mail: f.bour@physioflow.com

Response to the “Letter to the Editor: RE: Effect of interval training on cognitive functioning and cerebral oxygenation in obese patients: A pilot study”

We thank Mr Frank Bour for his comment. Table I presents the cardiac index (CImax), stroke volume index (SVImax), cardiac output (COmax LBM) and stroke volume (SVmax LBM) normalized by lean body mass (LBM) at maximal effort. There were no significant changes (Wilcoxon’s signed-rank test) in these 4 parameters, and larger effect sizes were generally observed compared with non-normalized values (1).

In conclusion, future studies on high-intensity interval training in obese subjects with larger sample size will be required to document their effects on haemodynamic variables.

Table I. Normalized maximal haemodynamic variables before and after 4 months of high-intensity interval training in obese subjects (n = 6)

Parameters

Pre

Mean (SD)

Post

Mean (SD)

p-value

Effect size

Hedge’s, g

CImax (l/min/m2)

8.45 (1.59)

8.87 (1.09)

0.50

0.28

SVImax (ml/m2)

47 (7)

53 (6)

0.13

0.85

COmax LBM (l/min/kg)

0.30 (0.06)

0.31 (0.08)

0.50

0.17

SVmax LBM (ml/kg)

1.68 (0.33)

1.90 (0.49)

0.22

0.48

LBM: lean body mass; CImax: cardiac index; SVImax: stroke volume index; COmax LBM: cardiac output; SVmax LBM: stroke volume; SD: standard deviation.

Reference

Mathieu Gayda,

Cardiovascular Prevention and Rehabilitation Centre (Centre ÉPIC), Montreal Heart Institute and University of Montreal, 5055 St-Zotique Street East, Montreal, Quebec H1T 1N6, Canada. E-mail: mathieu.gayda@icm-mhi.org

1. Drigny J, Gremeaux V, Dupuy O, Gayda M, Bherer L, Juneau M, Nigam A. Effects of interval training on cognitive functioning and cerebral oxygenation in obese patients: a pilot study. J Rehabil Med 2014; 46: 1050–1054.

Comments

Do you want to comment on this paper? The comments will show up here and if appropriate the comments will also separately be forwarded to the authors. You need to login/create an account to comment on articles. Click here to login/create an account.
Advertisement