ORIGINAL ARTICLE

Effects of dominant somatotype on aerobic capacity trainability

M Chaouachi¹, A Chaouachi², K Chamari², M Chtara¹, Y Feki¹, M Amri¹, F Trudeau³

¹ Laboratoire de Physiologie de la Nutrition, Faculté des Sciences de Tunis, El Manar 1060 Tunis, Tunisia
² Centre National de la Médecine et des Sciences du Sport, Unité de Recherche "Evaluation, Sport, Santé", CNMSS, El Menzah, Tunisia
³ Département des Sciences de l’Activité Physique, Université du Québec à Trois-Rivières, Québec, Canada

Correspondence to:
Correspondence to:
Mustapha Chaouachi
Laboratoire de Physiologie de la Nutrition, Faculté des Sciences de Tunis, El Manar 1060, Tunis, Tunisia; mustapha.chaouachi{at}issep-ks.rnu.tn

Purpose: This study examined the association between dominant somatotype and the effect on aerobic capacity variables of individualised aerobic interval training.

Methods: Forty one white North African subjects (age 21.4±1.3 years; V^·o_2max = 52.8±5.7 ml kg^–1 min^–1) performed three exercise tests 1 week apart (i) an incremental test on a cycle ergometer to determine V^·o_2max and V^·o₂ at the second ventilatory threshold (VT2); (ii) a VAM-EVAL track test to determine maximal aerobic speed (vV^·o_2max); and (iii) an exhaustive constant velocity test to determine time limit performed at 100% vV^·o_2max (tlim100). Subjects were divided into four somatometric groups: endomorphs-mesomorphs (Endo-meso; n = 9), mesomorphs (Meso; n = 11), mesomorphs-ectomorphs (Meso-ecto; n = 12), and ectomorphs (Ecto; n = 9). Subjects followed a 12 week training program (two sessions/week). Each endurance training session consisted of the maximal number of successive fractions for each subject. Each fraction consisted of one period of exercise at 100% of vV^·o_2max and one of active recovery at 60% of vV^·o_2max. The duration of each period was equal to half the individual tlim100 duration (153.6±39.7 s). After the training program, all subjects were re-evaluated for comparison with pre-test results.

Results: Pre- and post-training data were grouped by dominant somatotype. Two way ANOVA revealed significant somatotype-aerobic training interaction effects (p<0.001) for improvements in vV^·o_2max, V^·o_2max expressed classically and according to allometric scaling, and V^·o₂ at VT2. There were significant differences among groups post-training: the Meso-ecto and the Meso groups showed the greatest improvements in aerobic capacity.

Conclusion: The significant somatotype-aerobic training interaction suggests different trainability with intermittent and individualised aerobic training according to somatotype.

Abbreviations: ACE, angiotensin converting enzyme; ANCOVA, analysis of covariance; ANOVA, analysis of variance; HR, heart rate; RER, respiratory exchange ratio; V^·o_2max, maximal oxygen uptake; VT, ventilatory threshold

Keywords: aerobic fitness; body composition; interval training; somatotype; trainability

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