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Articles in PresS, published online ahead of print June 5, 2002
Physiol Genomics, 10.1152/physiolgenomics.00043.2002
Submitted on April 15, 2002
Accepted on June 4, 2002
1 Human Genomics Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, USA
2 Division of Biostatistics, Washington University School of Medicine, St. Louis, MO, USA
3 Physical Activity Sciences Laboratory, Laval University, Ste-Foy, PQ, Canada
4 Laboratory of Molecular Endocrinology, Laval University, Ste-Foy, PQ, Canada
5 School of Kinesiology and Leisure Studies, University of Minnesota, Minneapolis, MN, USA
6 Department of Kinesiology, Indiana University, Bloomington, IN, USA
7 Department of Health and Kinesiology, Texas A&M University, College Station, TX, USA
8 Division of Biostatistics, Washington University School of Medicine, St. Louis, MO, USA; Departments of Genetics and Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
* To whom correspondence should be addressed. E-mail: rankint{at}pbrc.edu.
A genome-wide linkage scan was performed for genes affecting submaximal exercise cardiac output (Q) and stroke volume (SV) in the sedentary state and their responses to a standardized 20-week endurance training program. A total of 509 polymorphic markers were used and 328 pairs of siblings from 99 White nuclear families and 102 sibling pairs from 105 Black family units were available. Q and SV were measured in relative steady state during exercise at 50 W (Q50 and SV50, respectively). Baseline phenotypes were adjusted for age, sex and body surface area (BSA), and the training responses (post-training - baseline, 
) were adjusted for age, sex, baseline BSA and baseline value of the phenotype. Three analytical strategies were used: a multi-point variance components linkage analysis using all the family data, and regression -based single- and multipoint linkage analyses using pairs of siblings. In Whites, baseline SV50 and SV50 showed promising linkages (p<0.0023) with markers on chromosomes 14q31.1 and 10p11.2, respectively. Suggestive evidence of linkage (0.01 > p > 0.0023) for SV50 and Q50 was detected on chromosome 2q31.1, and for baseline SV50 and Q50 on chromosome 9q32-q33. In Blacks, markers on 18q11.2 showed promising linkages with baseline Q50. Suggestive evidence of linkage was found in three regions for baseline SV50 (1p21.3, 3q13.3, 12q13.2) and one for baseline SV50 and Q50 (10p14). All these chromosomal regions include several potential candidate genes and therefore warrant further studies in the HERITAGE cohort and other studies.
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