Baarikello
Banned
- Liittynyt
- 14.5.2002
- Viestejä
- 1 408
Tämmöinen tutkimus löytyi jostain:
"Effects of dehydration on isometric muscular strength and endurance.
Greiwe JS, Staffey KS, Melrose DR, Narve MD, Knowlton RG.
Med Sci Sports Exerc 1998 Feb; 30(2):284-8
To examine the effects of rapid dehydration on isometric muscular strength
and endurance, seven men were tested at baseline (control) and after a
dehydration (dHST) and a euhydration (eHST) heat stress trial. The dHST
consisted of intermittent sauna exposure until 4% of body mass was lost,
whereas the eHST consisted of intermittent sauna exposure (same duration as
dHST) with water replacement. Peak torque was determined for the knee
extensors and elbow flexors during three isometric maximal voluntary
contractions. Time to fatigue was determined by holding a maximal voluntary
contraction until torque dropped below 50% peak torque for 5 secs. Strength an
d endurance were assessed 3.5 h after the HSTs (no food or water intake).
Body mass was decreased 3.8 ± 0.4% post dHST and 0.4 ± 0.3% post eHST.
Plasma volume was decreased 7.5±4.6% and 5.7 ± 4.4%, 60 and 120 min post
dHST, respectively. A small (1.6 mEq per litre) but significant increase was
found for serum Na+ concentration 60 min post dHST but had returned to
predehydration level 120 min post dHST. Serum K+ and myoglobin concentrations
were not affected by HSTs.
Peak torque was not different among control, dHST, and eHST for the knee
extensors (Mean (Nm) ± SD, 285 ± 79, 311+/-113, and 297±79) and elbow
flexors (79 ±12, 83 ±15, and 80 ±12). Time to fatigue was not different
among control, dHST and eHST for the knee extensors (Mean (s) ±SD. 42.4
±11.5, 45.3 ±7.6, and 41.8 ±-6.0) and elbow flexors (48.2 ±8.9, 44.0 ± 9.4,
and 46.0 ± 6.4).
These results provide evidence that isometric strength and endurance are
unaffected 3.5 hours after dehydration of approximately 4% body mass. "
"Effects of dehydration on isometric muscular strength and endurance.
Greiwe JS, Staffey KS, Melrose DR, Narve MD, Knowlton RG.
Med Sci Sports Exerc 1998 Feb; 30(2):284-8
To examine the effects of rapid dehydration on isometric muscular strength
and endurance, seven men were tested at baseline (control) and after a
dehydration (dHST) and a euhydration (eHST) heat stress trial. The dHST
consisted of intermittent sauna exposure until 4% of body mass was lost,
whereas the eHST consisted of intermittent sauna exposure (same duration as
dHST) with water replacement. Peak torque was determined for the knee
extensors and elbow flexors during three isometric maximal voluntary
contractions. Time to fatigue was determined by holding a maximal voluntary
contraction until torque dropped below 50% peak torque for 5 secs. Strength an
d endurance were assessed 3.5 h after the HSTs (no food or water intake).
Body mass was decreased 3.8 ± 0.4% post dHST and 0.4 ± 0.3% post eHST.
Plasma volume was decreased 7.5±4.6% and 5.7 ± 4.4%, 60 and 120 min post
dHST, respectively. A small (1.6 mEq per litre) but significant increase was
found for serum Na+ concentration 60 min post dHST but had returned to
predehydration level 120 min post dHST. Serum K+ and myoglobin concentrations
were not affected by HSTs.
Peak torque was not different among control, dHST, and eHST for the knee
extensors (Mean (Nm) ± SD, 285 ± 79, 311+/-113, and 297±79) and elbow
flexors (79 ±12, 83 ±15, and 80 ±12). Time to fatigue was not different
among control, dHST and eHST for the knee extensors (Mean (s) ±SD. 42.4
±11.5, 45.3 ±7.6, and 41.8 ±-6.0) and elbow flexors (48.2 ±8.9, 44.0 ± 9.4,
and 46.0 ± 6.4).
These results provide evidence that isometric strength and endurance are
unaffected 3.5 hours after dehydration of approximately 4% body mass. "