Sex differences in response to maximal exercise stress test in trained adolescents

BMC Pediatrics

Table 2 Response to exercise of selected ventilatory and metabolic variables in the study subjects

	Females (N = 24)		Males (N = 27)
	Before exercise/rest	Maximum/after exercise	Before exercise/rest	Maximum/after exercise
Ventilation and lung volumes
Ventilation (l/min)	#23.5 ± 5.7; N = 22	83.5 ± 12.3; N = 23 *	#24.9 ± 5.1	110.7 ± 16.4 *†
Normalized ventilation (l/min/kg)	#0.39 ± 0.08; N = 22	1.38 ± 0.20; N = 23 *	#0.36 ± 0.09	1.61 ± 0.26 *†
Ventilated lung volume (l)	2.58 ± 0.56	3.55 ± 0.54; N = 19 *	3.78 ± 0.66 †	4.82 ± 1.06; N = 25 *†
Normalized ventilated lung volume (l/kg)	0.043 ± 0.012	0.060 ± 0.012; N = 19 *	0.055 ± 0.011 †	0.071 ± 0.016; N = 25 *†
Metabolic factors
Blood lactate (mmol/l)	1.60 ± 0.31;N = 22	11.63 ± 2.47;N = 23 *	1.70 ± 0.50	13.03 ± 3.22 *†
Blood pH	7.356 ± 0.030;N = 22	7.254 ± 0.049;N = 23 *	7.354 ± 0.027	7.248 ± 0.048 *
Blood base-excess (mmol/l)	0.76 ± 1.07;N = 22	−9.77 ± 2.87;N = 23 *	1.34 ± 0.89	−10.18 ± 2.93 *
Blood HCO₃ ^- (mmol/l)	24.4 ± 1.0;N = 22	16.6 ± 2.0;N = 23 *	24.9 ± 0.8	16.5 ± 2.0 *

Values are expressed as mean ± SD. Default number of subjects are N = 24 for female and N = 27 for male, respectively, otherwise the specific number of subjects included in the analysis is noted. #) denotes that ventilation and lung volume measurements were performed with “Before exercise/rest” values recorded during the initial stable phase of exercise at 60 watt and compared to recordings made during maximum exercise. Metabolic factors were measured at rest before start of exercise and 10 min following the end of maximal exercise. *) denotes a statistical significant difference (P < 0.05, by ANOVA) comparing corresponding variable “Before exercise/rest” with “Maximum/after exercise”. †) denotes a statistical significant difference (P < 0.05, by ANOVA) comparing female and male subjects.

ISSN: 1471-2431