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

G. Wilson; P. P. Pritchard; C. Papageorgiou; S. Phillips; P. Kumar; C. Langan-Evans; H. Routledge; D. J. Owens; J. P. Morton; G. L. Close

doi:10.1055/s-0035-1549920

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2015; 36(12): 1008-1014
DOI: 10.1055/s-0035-1549920

Nutrition

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

Autor*innen

G. Wilson

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
P. P. Pritchard

²The Culverhay Surgery, Bristol, UK
C. Papageorgiou

³The Priory Hospital, Manchester, United Kingdom
S. Phillips

⁴Royal Liverpool University Hospital, Clinical Biochemistry, Liverpool, United Kingdom
P. Kumar

⁵Aintree University Hospital, Radiology, Liverpool, United Kingdom
C. Langan-Evans

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
H. Routledge

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
D. J. Owens

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
J. P. Morton

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom
G. L. Close

¹Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom

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), VO_2max (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.

Key words

nutrition - weight-loss - intervention - horseracing

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Referenzen

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