RESULTS

The group mean values±S.D. for oxygen consumption, breath rate, tidal volume and minute ventilation for CM and SH sessions are given in Table I.
The Sessions by States interaction was significant for: (i) oxygen consumption [F=193.16, for DF=2.99, 146.94, P < .001, Huynh-Feldt e=.600]; (ii) breath rate [F=46.291, for DF=4.18, 205.07, P < .001, Huynh-Feldt e=.837]; (iii) tidal volume [F=42.58, for DF=4.17, 204.70, P < .001, Huynh-Feldt e=.836]; and for (iv) minute ventilation [F=180.27, for DF=3.07, 150.85, P < .001, Huynh-Feldt e=.616]. This suggested that for all four measurements Sessions and States were not independent of each other (Zar, 2005).
Post-hoc tests for multiple comparisons were performed with Bonferroni adjustment. The oxygen consumption increased during the D1, D2, and D3 phases (corresponding to yoga postures) of CM but significantly reduced after CM compared to the ‘pre’ state (P < .001, for all comparisons). In the SH session oxygen consumption reduced in all the phases compared to respective ‘pre’ states (P <.001, for all comparisons). The comparison

of post-measurements of the two sessions (CM and SH) showed that oxygen consumption was significantly lower after the CM session compared to after the SH session (P < .001). There was a significant increase in breath rate during the D2, and D3 phases (corre- sponding to yoga postures) of CM and a significant reduction after CM compared to the ‘pre’ state (P < .001, for all comparisons). There was no significant change in the SH session. Also, the comparison of post-measurements of the two sessions (CM and SH) showed no significant change. The tidal volume increased during the D1 (P < .001), D2 (P < .05) and D3 (P < .001) phases of the CM session and significantly reduced after CM compared to the ‘pre’ state (P < .001). There was no significant change in the SH session. The comparison of post-measurements of the two sessions (CM and SH) showed that the tidal volume was significantly lower after the CM session compared to after the SH session (P < .001). The minute ventilation increased during the D1, D2, and D3 phases (corresponding to yoga postures) of CM but significantly reduced after CM compared to the ‘pre’ state (P < .001, for all comparisons). During the SH session it significantly reduced in the D1 phase compared to the ‘pre’ state (P <.05) while there was no change after SH. The comparison of post-measurements of the two sessions (CM and SH) showed that the minute ventilation was significantly lower after the CM session compared to after the SH session (P < .001).

Sub-Sample with a longer ‘post’ period (n=10)

The Sessions by States interaction was significant for: (i) oxygen consumption [F = 47.86, for DF=5.01, 45.12, P < .001, Huynh-Feldt e=.501]; (ii) breath rate [F=8.58, for DF=2.36, 21.29, P < .001, Huynh-Feldt e=.237]; (iii) tidal volume [F=7.51, for DF=1.96, 17.64, P <.001, Huynh-Feldt e=.196]; and (iv) minute ventilation [F=8.58, for DF=3.26, 29.37, P < .001, Huynh-Feldt e=.326]. Post-hoc tests for multiple comparisons were performed with Bonferroni adjustment. The oxygen consumption increased during the D1, D2, and D3 phases (corresponding to yoga postures) of CM (P <.01, for all comparisons) and reduced after CM (P <.01). This trend of reduction in oxygen consumption continued further throughout the 30 min of the post period compared to the ‘pre’ state (P < .05, for post 1 and post 4, and P < .01, for post 2, post 3, post 5, and post 6). In the post period of SH [i.e., post 2 (P < .05), post 3 and post 6 (P <.01)] session the oxygen consumption reduced compared to the ‘pre’ state. The comparison of post-measurements of the two sessions (CM and SH) showed that the oxygen consumption was significantly lower in all post phases of CM session compared to the respective phases of the SH session (P < .001). The trends of change in oxygen consumption have been shown in Fig. 1(A). The trends of change in breath rate, tidal volume, and minute ventilation in this sub-sample are given in Figs. 1(B), 1(C), and 1(D), respectively.