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Physical Capacity in Twins

Published online by Cambridge University Press:  27 January 2025

Lars-Magnus Engström  and
Siv Fischbein
Lars-Magnus Engström
Affiliation:
Department of Educational Research, School of Education, Stockholm, Sweden
Siv Fischbein*
Affiliation:
Department of Educational Research, School of Education, Stockholm, Sweden
*
Department of Educational and Psychological Research, School of Education, S-100 26 Stockholm, Sweden

Abstract

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A comparison of physical capacity, (measured by vital capacity, muscular strength and physical work capacity) in twin boys and controls failed to indicate significant differences. Intrapair correlations showed the MZ twins to be much more similar than the DZ twins in all the capacity measures. The correlations were lower, however, for both MZ and DZ twins for physical work capacity than for the other two capacity variables. When amount of physical exercise during leisure time is kept under control, the DZ twins tend to be more similar for physical work capacity or muscular strength, and the correlations tend to be of the same magnitude for MZ twins. Physical work capacity therefore appears, in this study, to be a more environmentally influenced variable than either vital capacity or muscular strength.

Riassunto

RIASSUNTO

Un raffronto della capacità fisica (valutata mediante volume respiratorio, forza muscolare e capacità di lavoro fisico) in gemelli e non gemelli maschi non ha indicato differenze significative. Le correlazioni intracoppia hanno indicato una maggiore somiglianza nei gemelli MZ rispetto ai DZ per tutte le misure. Tuttavia, le correlazioni sono risultate inferiori, in gemelli sia MZ che DZ, per la capacità di lavoro fisico rispetto alle altre due variabili. Una volta che si controlli l'esercizio fisico durante il tempo libero, i gemelli DZ tendono a somigliarsi di più, ed i MZ di meno, per la capacità di lavoro fisico rispetto al volume respiratorio o alla forza muscolare. La capacità di lavoro fisico risulterebbe dunque, in questo studio, come una variabile maggiormente soggetta all'influenza ambientale di quanto non lo siano il volume respiratorio o la forza muscolare.

Résumé

RÉSUMÉ

Une comparaison de la capacité physique (évaluée moyennant capacité vitale, force musculaire et capacité de travail physique) chez des jumeaux et des non-jumeaux mâles, n'a pas indiqué de différences significatives. Les corrélations entre jumeaux MZ étaient plus élevés par rapport aux corrélations entre jumeaux DZ pour toutes les mensurations. Chez les MZ comme chez les DZ, toutefois, les corrélations étaient moins élevées pour la capacité de travail physique par rapport aux deux autres variables. Si l'exercice physique dans le temps libre est contrôlé, les jumeaux DZ tendent à se ressembler de plus, et les MZ de moins, dans la capacité de travail physique par rapport aux deux autres variables. Cette-ci serait donc plus influencée de la capacité vitale ou de la force musculaire par les facteurs ambiants.

Zusammenfassung

ZUSAMMENFASSUNG

Ein Vergleich der körperlichen Leistungsfähigkeit (gemessen mit Hilfe des Atemvolumens, der Muskelkraft und der körperlichen Arbeitsleistung) ergab keine wesentlichen Unterschiede zwischen den männlichen Zwillingen und Einlingen. Für alle Masse war die Korrelation zwischen den Paarlingen grösser bei EZ als bei ZZ. Sowohl bei EZ als bei ZZ waren jedoch die Korrelationen für die Leistungen der körperlichen Arbeit geringer als die für die anderen beiden Variablen. Bei einer Kontrolle der Leibesübungen in der Freizeit zeigt sich bei ZZ eine grössere Tendenz zur Ähnlichkeit; bei EZ besteht diese Tendenz hingegen weniger in den Leistungen der körperlichen Arbeit als in den anderen beiden Variablen. Aus dieser Untersuchung würde also hervorgehen, dass die Leistungen der körperlichen Arbeit in grösserem Masse umweltsbedingt sind als Atemvolumen und Muskelkraft.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 26 , Issue 2 , April 1977 , pp. 159 - 165
Copyright
Copyright © The International Society for Twin Studies 1977

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