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Effects of dominant somatotype on aerobic capacity trainability
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  1. M Chaouachi1,
  2. A Chaouachi2,
  3. K Chamari2,
  4. M Chtara1,
  5. Y Feki1,
  6. M Amri1,
  7. F Trudeau3
  1. 1Laboratoire de Physiologie de la Nutrition, Faculté des Sciences de Tunis, El Manar 1060 Tunis, Tunisia
  2. 2Centre National de la Médecine et des Sciences du Sport, Unité de Recherche “Evaluation, Sport, Santé”, CNMSS, El Menzah, Tunisia
  3. 3Département des Sciences de l’Activité Physique, Université du Québec à Trois-Rivières, Québec, Canada
  1. Correspondence to:
 Mustapha Chaouachi
 Laboratoire de Physiologie de la Nutrition, Faculté des Sciences de Tunis, El Manar 1060, Tunis, Tunisia; mustapha.chaouachiissep-ks.rnu.tn

Abstract

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˙o2max = 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˙o2max and V˙o2 at the second ventilatory threshold (VT2); (ii) a VAM-EVAL track test to determine maximal aerobic speed (vV˙o2max); and (iii) an exhaustive constant velocity test to determine time limit performed at 100% vV˙o2max (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˙o2max and one of active recovery at 60% of vV˙o2max. 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˙o2max, V˙o2max 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.

  • ACE, angiotensin converting enzyme
  • ANCOVA, analysis of covariance
  • ANOVA, analysis of variance
  • HR, heart rate
  • RER, respiratory exchange ratio
  • V˙o2max, maximal oxygen uptake
  • VT, ventilatory threshold
  • aerobic fitness
  • body composition
  • interval training
  • somatotype
  • trainability

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Footnotes

  • Competing interests: none declared

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