Int J Sports Med 2015; 36(12): 1008-1014
DOI: 10.1055/s-0035-1549920
Nutrition
© Georg Thieme Verlag KG Stuttgart · New York

Fasted Exercise and Increased Dietary Protein Reduces Body Fat and Improves Strength in Jockeys

G. Wilson
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
,
P. P. Pritchard
2   The Culverhay Surgery, Bristol, UK
,
C. Papageorgiou
3   The Priory Hospital, Manchester, United Kingdom
,
S. Phillips
4   Royal Liverpool University Hospital, Clinical Biochemistry, Liverpool, United Kingdom
,
P. Kumar
5   Aintree University Hospital, Radiology, Liverpool, United Kingdom
,
C. Langan-Evans
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
,
H. Routledge
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
,
D. J. Owens
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
,
J. P. Morton
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
,
G. L. Close
1   Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
› Author Affiliations
Further Information

Publication History



accepted after revision 05 April 2015

Publication Date:
24 July 2015 (online)

Abstract

The present study assessed the effects of a diet and exercise intervention in jockeys on body composition, metabolism, bone and mental health. 10 jockeys followed an individually prescribed 6-wk diet (Carbohydrate=2.5–3.5 g/kg, Protein=2.5 g/kg, Fat=1.0 g/kg). Body mass (59.2±4.6 vs. 57.6±4.5 kg), fat mass (7.5±3.5 vs. 6.2±2.6) and body fat (13.1±5.9 vs. 11.5±4.9%) all decreased (P<0.05) from pre to post-intervention whilst lean mass (47.1±5.3 vs. 47.0±5.5 kg) was maintained (P=0.80). RMR (1703±329 vs. 1975±313 kcal.d-1), VO2max (3.8±0.8 vs. 4.1±0.7 L/min− 1) chest strength (65±11 vs. 71±13 kg), leg strength (160±28 vs. 175±29 kg) and jumping height (40±6 vs. 48±5 cm) significantly increased (P<0.05). Bone health (DXA) did not change (P>0.05) at hip (−1.04±1.29 vs. − 0.76±0.71) or lumbar sites (−1.32±0.76 vs. − 1.31±0.77). Psychometrics (GHQ-12 and EAT-26) remained unchanged (10.3±4.3 vs. 8.9±3.8 and 14.8±9.6 vs. 11.0±5.6, P>0.05, respectively). This approach represents a marked difference from jockeys’ habitual weight-making that largely involves dehydration and food deprivation.

 
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