Relationship between maximal aerobic power and the fatiguability during repeated isokinetic contractions.
- VernacularTitle:最大有酸素性パワーと等速性筋出力の持続能力との関係
- Author:
ISAMU NEMOTO
;
HIROAKI KANEHISA
;
TETSUO FUKUNAGA
;
NAOYA TSUNODA
;
KOUICHI SHIMOSHIKIYOU
;
NOBUHIKO YOSHIOKA
;
MITSUMASA MIYASHITA
- Publication Type:Journal Article
- Keywords:
Relationship;
Maximal aerobic power;
Muscle fatigue;
Isokinetic strength
- From:Japanese Journal of Physical Fitness and Sports Medicine
1988;37(1):77-84
- CountryJapan
- Language:Japanese
-
Abstract:
To investigate the relationship between maximal aerobic power (VO2max) and fatigu-abililty during repeated isokinetic contractions, 39 male speed skaters (mean 20.8 years) served as subjects. They were divided into two groups according to their VO2max levels ; high VO2max group (HI, n=19) and low VO2max group (LO, n=20) . VO2max was measured in all subjects during incremental exercise on a bicycle ergometer and body composition was determined by densitometry. Cross-sectional area (CSA) of the leg extensor muscles was evaluated using ultrasonic method. Fatiguability was assessed during the fatigue test consisting of 50 repeated isokinetic knee-extensions at an angular velocity of 180 deg⋅sec-1. Remark-able findings include :
1. There were no significant differences in body composition and thigh composition between the two groups except for high subcutaneous fat in group LO.
2. There were significant differences in VO2max between group HI (3.93l⋅min-1, 67.3 ml⋅kg LBM-1⋅min-1) and group LO (3.59l⋅min-1, 59.9 ml⋅kg LBM-1⋅min-1) .
3. In the fatigue test, the average initial values did not differ, however, the average final values were higher in group HI. Also, a significant difference was observed in per unit CSA between the two groups.
4. Higher peak forces (kg) in group HI were observed after the initial 30 dymanic contractions per unit CSA and % of peak values (% peak force) .
5. A close relationship was demonstrated between VO2max per LBM and the fatigue index, i. e., the mean decline in peak force with 50 contractions (r=-0.37, p<0.05) .
Based on the present findings it is suggested that maximal aerobic power (VO2max) influences the rate of fatigue development even during short-term maximal isokinetic contractions, and that there may be some physiological cross-linkages between cardiopulmonary regulation and the metabolic properties of skeletal muscles. This finding is also in conformity with earlier results indicating the importance of oxygen delivery as a limiting factor for muscle performance.
