SHORT-TERM BONE BIOCHEMICAL RESPONSE TO A SINGLE BOUT OF HIGH-IMPACT EXERCISE , JSSM-2009, Vol.8, Issue 4, 553

JOURNAL OF SPORTS SCIENCE & MEDICINE

Research article

SHORT-TERM BONE BIOCHEMICAL RESPONSE TO A SINGLE BOUT OF HIGH-IMPACT EXERCISE

Timo Rantalainen¹, Ari Heinonen², Vesa Linnamo², Paavo V. Komi², Timo E. S. Takala³ and Heikki Kainulainen¹

¹Neuromuscular Research Center, Department of Biology of Physical Activity, and ²Department of Health Sciences, University of Jyväskylä, Finland ³Department of Sports Medicine, Oulu Deaconess Institute, Oulu, Finland.

Received		23 April 2009
Accepted		25 August 2009
Published		01 December 2009

ABSTRACT

Bone response to a single bout of exercise can be observed with biochemical markers of bone formation and resorption. The purpose of this study was to examine the response of bone biochemical markers to a single bout of exhaustive high-impact exercise. 15 physically active young subjects volunteered to participate. The subjects performed continuous bilateral jumping with the ankle plantarflexors at 65 % of maximal ground reaction force (GRF) until exhaustion. Loading was characterized by analyzing the GRF recorded for the duration of the exercise. Venous blood samples were taken at baseline, immediately after, 2h and on day 1 and day 2 after the exercise. Procollagen type I amino terminal propeptide (P1NP, marker of bone formation) and carboxyterminal crosslinked telopeptide (CTx, marker of bone resorption) were analyzed from the blood samples. CTx increased significantly (32 %, p = 0.015) two days after the exercise and there was a tendensy towards increase seen in P1NP (p = 0.053) one day after the exercise. A significant positive correlation (r = 0.49 to 0.69, p < 0.038) was observed between change in P1NP from baseline to day 1 and exercise variables (maximal slope of acceleration, body weight (BW) adjusted maximal GRF, BW adjusted GRF exercise intensity and osteogenic index). Based on the two biochemical bone turnover markers, it can be concluded that bone turnover is increased in response to a very strenuous single bout of exhaustive high-impact exercise.

Key words: Bone biochemical marker, jumping, bone turnover, osteogenic index.

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