Bone Mineral Density in Flatwater Sprint Kayakers

Abstract. To elucidate the possible skeletal benefits of the muscular contractions and the nonweight-bearing loading pattern associated with kayaking, we investigated the bone mineral density (BMD, g/cm2) of 10 elite kayakers, six males and four females, with a median age of 19 years. Each subject was compared with the mean value of two matched controls. BMD of the total body, head, ribs, humerus, legs, proximal femur (neck, wards, trochanter), spine, lumbar spine, and bone mineral content (BMC, g), of the arms was obtained using a dual energy X-ray absorptiometer (DXA). Body composition was also assessed. The kayakers had a significantly (P < 0.05–0.01) greater BMD in most upper body sites: left and right humerus (10.4% and 11.7%), respectively, ribs (6.4%), spine (10.9%), and a greater BMC of the left and right arm (15.7% and 10.6%, respectively). No significant differences in the BMD of the total body, head, or any of the lower body sites were found, except for the pelvis, which was significantly greater in kayakers (5.1%). The controls had a significantly lesser lean body mass (10.4%) and greater percentage of body fat (19.5%) than the kayakers. Bivariate correlation analysis in the controls demonstrated significant and strong relationships between BMD in upper body sites and lean body mass, weight, and fat; the effects of training seem to outweigh most such relationships in kayakers. In conclusion, it seems that the loading pattern and muscular contractions associated with kayaking may result in site-specific adaptations of the skeleton.

[1]  O. Johnell,et al.  Bone mass in an urban and a rural population: A comparative, population‐based study in Southern Sweden , 1991, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[2]  T. Noakes,et al.  Bone mineral density in mature, premenopausal ultramarathon runners. , 1995, Medicine and science in sports and exercise.

[3]  K Huntington,et al.  The relationship of swimming exercise to bone mass in men and women. , 1989, Archives of internal medicine.

[4]  S L Hui,et al.  Role of physical activity in the development of skeletal mass in children , 1991, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[5]  E. Orwoll,et al.  Precision of dual‐energy x‐ray absorptiometry: Development of quality control rules and their application in longitudinal studies , 1993, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[6]  N. Willows,et al.  Mechanical loading regime and its relationship to bone mineral density in children. , 1993, Medicine and science in sports and exercise.

[7]  R J Shephard,et al.  Science and Medicine of Canoeing and Kayaking , 1987, Sports medicine.

[8]  J. Clasey,et al.  A comparison of bone mineral densities among female athletes in impact loading and active loading sports. , 1995, Bone.

[9]  R I Price,et al.  Exercise and bone mineral density in mature female athletes. , 1997, Medicine and science in sports and exercise.

[10]  A Heinonen,et al.  Bone mineral density of female athletes in different sports. , 1993, Bone and mineral.

[11]  H C Kemper,et al.  Weight‐bearing activity during youth is a more important factor for peak bone mass than calcium intake , 1994, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[12]  W. Risser,et al.  Variations in bone status of contralateral and regional sites in young athletic women. , 1995, Medicine and science in sports and exercise.

[13]  R. Lorentzon,et al.  Bone Mass in Female Volleyball Players: A Comparison of Total and Regional Bone Mass in Female Volleyball Players and Nonactive Females , 1997, Calcified Tissue International.

[14]  C. Weaver,et al.  Previous physical activity relates to bone mineral measures in young women. , 1996, Medicine and science in sports and exercise.

[15]  R. Marcus,et al.  Effects of a one‐year high‐intensity versus low‐intensity resistance training program on bone mineral density in older women , 1995, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[16]  L E Lanyon,et al.  Control of bone architecture by functional load bearing , 1992, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[17]  N. Dalén,et al.  Bone mineral content and physical activity. , 1974, Acta orthopaedica Scandinavica.

[18]  B. Dawson-Hughes,et al.  Heritable and life‐style determinants of bone mineral density , 1993, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[19]  R. Marcus,et al.  Differential effects of swimming versus weight‐bearing activity on bone mineral status of eumenorrheic athletes , 1995, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[20]  P. Millett,et al.  Effect of exercise training programme on bone mineral density in novice college rowers. , 1995, British journal of sports medicine.

[21]  D B Burr,et al.  Physical activity and bone mass: exercises in futility? , 1993, Bone and mineral.

[22]  C C Glüer,et al.  A two‐year program of aerobics and weight training enhances bone mineral density of young women , 1995, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[23]  R. Lorentzon,et al.  Bone mass, muscle strength, and different body constitutional parameters in adolescent boys with a low or moderate exercise level. , 1995, Bone.

[24]  E. Russek-Cohen,et al.  Lower vertebral bone density in male long distance runners. , 1989, Medicine and science in sports and exercise.

[25]  H. Frost,et al.  Skeletal structural adaptations to mechanical usage (SATMU): 1. Redefining Wolff's Law: The bone modeling problem , 1990, The Anatomical record.

[26]  J. Reeve,et al.  Menstrual state and exercise as determinants of spinal trabecular bone density in female athletes. , 1990, BMJ.

[27]  O. Johnell,et al.  Differences in the incidence of hip fracture. Comparison of an urban and a rural population in southern Sweden. , 1988, Acta orthopaedica Scandinavica.

[28]  L E Lanyon,et al.  Static vs dynamic loads as an influence on bone remodelling. , 1984, Journal of biomechanics.

[29]  D A Nagel,et al.  Humeral hypertrophy in response to exercise. , 1977, The Journal of bone and joint surgery. American volume.

[30]  H K Genant,et al.  Determinants of bone density among athletes engaged in weight-bearing and non-weight-bearing activity. , 1989, Journal of applied physiology.

[31]  A Heinonen,et al.  Effects of unilateral strength training and detraining on bone mineral mass and estimated mechanical characteristics of the upper limb bones in young women , 1996, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[32]  D R Carter,et al.  Effects of resistance and endurance exercise on bone mineral status of young women: A randomized exercise intervention trial , 1992, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[33]  P. Kannus,et al.  Precision of dual energy x-ray absorptiometry in the upper extremities. , 1993, Bone and mineral.

[34]  R. Marcus,et al.  Gymnasts exhibit higher bone mass than runners despite similar prevalence of amenorrhea and oligomenorrhea , 1995, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[35]  P. Egger,et al.  Childhood growth, physical activity, and peak bone mass in women , 1995, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[36]  C. Slemenda,et al.  High intensity activities in young women: site specific bone mass effects among female figure skaters. , 1993, Bone and mineral.

[37]  P. Franchimont,et al.  Bone Mineral Content and Physical Activity , 1987, International journal of sports medicine.

[38]  Ari Heinonen,et al.  Effect of Starting Age of Physical Activity on Bone Mass in the Dominant Arm of Tennis and Squash Players , 1995, Annals of Internal Medicine.

[39]  A Heinonen,et al.  Bone mineral density in female athletes representing sports with different loading characteristics of the skeleton. , 1995, Bone.