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Original articles  

The Journal of Sports Medicine and Physical Fitness 2001 June;41(2):216-22

language: English

The effects of supplemental carbohydrate ingestion on intermittent isokinetic leg exercise

Haff G. G. *, Schroeder C. A., Koch A. J., Kuphal K. E., Comeau M. J., Potteiger J. A.

From the
* Exer­cise Phys­iology Labor­a­tory Appa­la­chian ­State Uni­ver­sity, ­Boone, NC, USA and the Exer­cise Phys­iology Labor­a­tory Uni­ver­sity of ­Kansas, Law­rence, KS, USA


Back­ground. The pur­pose of ­this inves­ti­ga­tion was to ­examine the ­effects of car­bo­hy­drate (CHO) sup­ple­men­ta­tion on iso­ki­netic leg exten­sion/­flexion exer­cise per­for­mance, ­blood glu­cose ­responses, ­blood ­free ­fatty ­acid (FFA) ­responses, and ­blood lac­tate (La) ­responses.
­Methods. ­Eight resis­tance ­trained ­males (­mean±SEM, age: 23.7±1.3 yrs, ­height: 180.0±3.5 cm, body­mass: 94.9±4.9 kg) par­tic­i­pated in a ran­dom­ized, ­double ­blind pro­tocol ­with ­testing ses­sions sep­ar­ated by 7-d. Sub­jects ­were ­given CHO or pla­cebo (P) ­while per­forming 16 ­sets of 10 rep­e­ti­tions at 120°·s-1 on a ­Cybex iso­ki­netic dyna­mom­eter. Per­for­mance var­i­ables meas­ured ­were; ­total ­work (TW), ­average ­work (AW), ­peak ­torque (PT) and ­average ­torque (AT). ­Plasma glu­cose (PG), FFA, and La ­were meas­ured ­prior to ­testing (PRE), ­after set 8 (MID), and 16 (­POST).
­Results. ­Results indi­cated ­that the CHO treat­ment elic­ited sig­nif­i­cantly (p<0.05) ­more TW (CHO: 41.1±3.9 kJ; P: 38.1±3.9 kJ) and AW (CHO: 2.6±0.2 kJ; P: 2.4±0.2 kJ). ­There ­were no dif­fer­ences (p<0.05) ­between treat­ments for PT of the ham­strings (CHO: 91.6±6.5 Nm; P: 87.4±8.5 Nm) and quad­ri­ceps (CHO: 129.7±9.5 Nm; P: 123.0±10.6 Nm). The AT of the ham­strings (CHO: 77.8±5.2 Nm; P: 75.7±8.7 Nm) and quad­ri­ceps (CHO: 116.9±8.9 Nm; P: 110.0±8.5 Nm) ­were not sta­tis­ti­cally dif­ferent (p>0.05) ­between the treat­ments. PG was sig­nif­i­cantly ­higher at the ­POST ­blood ­draw in the CHO treat­ment. No sig­nif­i­cant dif­fer­ences (p>0.05) ­were ­observed ­between the treat­ments for FFA and La con­cen­tra­tions.
Con­clu­sions. The ­data ­from ­this inves­ti­ga­tion indi­cate ­that the use of CHO sup­ple­men­ta­tion ­during iso­ki­netic leg exer­cise ­allows for the per­for­mance of ­more ­work.

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