Abstract
This study examined the effects of different work-rest durations during 40 min intermittent treadmill exercise and subsequent running performance. Eight males (mean ± s: age 24.3 ± 2.0 years, body mass 79.4 ± 7.0 kg, height 1.77 ± 0.05 m) undertook intermittent exercise involving repeated sprints at 120% of the speed at which maximal oxygen uptake (v-V̇O2max) was attained with passive recovery between each one. The work-rest ratio was constant at 1:1.5 with trials involving short (6:9 s), medium (12:18 s) or long (24:36 s) work-rest durations. Each trial was followed by a performance run to volitional exhaustion at 150% v-V̇O2max. After 40 min, mean exercise intensity was greater during the long (68.4 ± 9.3%) than the short work-rest trial (54.9 ± 8.1% V̇O2max; P < 0.05). Blood lactate concentration at 10 min was higher in the long and medium than in the short work-rest trial (6.1 ± 0.8, 5.2 ± 0.9, 4.5 ± 1.3 mmol·l-1, respectively; P < 0.05). The respiratory exchange ratio was consistently higher during the long than during the medium and short work-rest trials (P < 0.05). Plasma glucose concentration was higher in the long and medium than in the short work-rest trial after 40 min of exercise (5.6 ± 0.1, 6.6 ± 0.2 and 5.3 ± 0.5 mmol·l-1, respectively; P < 0.05). No differences were observed between trials for performance time (72.7 ± 14.9, 63.2 ± 13.2, 57.6 ± 13.5 s for the short, medium and long work-rest trial, respectively; P = 0.17), although a relationship between performance time and 40 min plasma glucose was observed (P < 0.05). The results show that 40 min of intermittent exercise involving long and medium work-rest durations elicits greater physiological strain and carbohydrate utilization than the same amount of intermittent exercise undertaken with a short work-rest duration.
| Original language | English |
|---|---|
| Pages (from-to) | 835-842 |
| Number of pages | 8 |
| Journal | Journal of Sports Sciences |
| Volume | 23 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 1 Aug 2005 |
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Keywords
- Blood lactate
- Exercise
- Heart rate
- Oxygen consumption
- Plasma glucose
- Recovery
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Public Health, Environmental and Occupational Health
- Physical Therapy, Sports Therapy and Rehabilitation
Cite this
The effects of work-rest duration on intermittent exercise and subsequent performance. / Price, Mike; Halabi, Karl.
In: Journal of Sports Sciences, Vol. 23, No. 8, 01.08.2005, p. 835-842.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The effects of work-rest duration on intermittent exercise and subsequent performance
AU - Price, Mike
AU - Halabi, Karl
PY - 2005/8/1
Y1 - 2005/8/1
N2 - This study examined the effects of different work-rest durations during 40 min intermittent treadmill exercise and subsequent running performance. Eight males (mean ± s: age 24.3 ± 2.0 years, body mass 79.4 ± 7.0 kg, height 1.77 ± 0.05 m) undertook intermittent exercise involving repeated sprints at 120% of the speed at which maximal oxygen uptake (v-V̇O2max) was attained with passive recovery between each one. The work-rest ratio was constant at 1:1.5 with trials involving short (6:9 s), medium (12:18 s) or long (24:36 s) work-rest durations. Each trial was followed by a performance run to volitional exhaustion at 150% v-V̇O2max. After 40 min, mean exercise intensity was greater during the long (68.4 ± 9.3%) than the short work-rest trial (54.9 ± 8.1% V̇O2max; P < 0.05). Blood lactate concentration at 10 min was higher in the long and medium than in the short work-rest trial (6.1 ± 0.8, 5.2 ± 0.9, 4.5 ± 1.3 mmol·l-1, respectively; P < 0.05). The respiratory exchange ratio was consistently higher during the long than during the medium and short work-rest trials (P < 0.05). Plasma glucose concentration was higher in the long and medium than in the short work-rest trial after 40 min of exercise (5.6 ± 0.1, 6.6 ± 0.2 and 5.3 ± 0.5 mmol·l-1, respectively; P < 0.05). No differences were observed between trials for performance time (72.7 ± 14.9, 63.2 ± 13.2, 57.6 ± 13.5 s for the short, medium and long work-rest trial, respectively; P = 0.17), although a relationship between performance time and 40 min plasma glucose was observed (P < 0.05). The results show that 40 min of intermittent exercise involving long and medium work-rest durations elicits greater physiological strain and carbohydrate utilization than the same amount of intermittent exercise undertaken with a short work-rest duration.
AB - This study examined the effects of different work-rest durations during 40 min intermittent treadmill exercise and subsequent running performance. Eight males (mean ± s: age 24.3 ± 2.0 years, body mass 79.4 ± 7.0 kg, height 1.77 ± 0.05 m) undertook intermittent exercise involving repeated sprints at 120% of the speed at which maximal oxygen uptake (v-V̇O2max) was attained with passive recovery between each one. The work-rest ratio was constant at 1:1.5 with trials involving short (6:9 s), medium (12:18 s) or long (24:36 s) work-rest durations. Each trial was followed by a performance run to volitional exhaustion at 150% v-V̇O2max. After 40 min, mean exercise intensity was greater during the long (68.4 ± 9.3%) than the short work-rest trial (54.9 ± 8.1% V̇O2max; P < 0.05). Blood lactate concentration at 10 min was higher in the long and medium than in the short work-rest trial (6.1 ± 0.8, 5.2 ± 0.9, 4.5 ± 1.3 mmol·l-1, respectively; P < 0.05). The respiratory exchange ratio was consistently higher during the long than during the medium and short work-rest trials (P < 0.05). Plasma glucose concentration was higher in the long and medium than in the short work-rest trial after 40 min of exercise (5.6 ± 0.1, 6.6 ± 0.2 and 5.3 ± 0.5 mmol·l-1, respectively; P < 0.05). No differences were observed between trials for performance time (72.7 ± 14.9, 63.2 ± 13.2, 57.6 ± 13.5 s for the short, medium and long work-rest trial, respectively; P = 0.17), although a relationship between performance time and 40 min plasma glucose was observed (P < 0.05). The results show that 40 min of intermittent exercise involving long and medium work-rest durations elicits greater physiological strain and carbohydrate utilization than the same amount of intermittent exercise undertaken with a short work-rest duration.
KW - Blood lactate
KW - Exercise
KW - Heart rate
KW - Oxygen consumption
KW - Plasma glucose
KW - Recovery
UR - http://www.scopus.com/inward/record.url?scp=23144464153&partnerID=8YFLogxK
U2 - 10.1080/02640410400021971
DO - 10.1080/02640410400021971
M3 - Article
VL - 23
SP - 835
EP - 842
JO - Journal of Sports Sciences
JF - Journal of Sports Sciences
SN - 0264-0414
IS - 8
ER -